./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec 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_i15_o15-2.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 81c3a4bcb7df13b97375e2abc10c6fdc1a8edbd3 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 09:00:41,668 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 09:00:41,669 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 09:00:41,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 09:00:41,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 09:00:41,702 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 09:00:41,702 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 09:00:41,713 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 09:00:41,714 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 09:00:41,715 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 09:00:41,716 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 09:00:41,716 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 09:00:41,726 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 09:00:41,731 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 09:00:41,731 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 09:00:41,732 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 09:00:41,733 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 09:00:41,733 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 09:00:41,753 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 09:00:41,754 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 09:00:41,755 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 09:00:41,756 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 09:00:41,757 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 09:00:41,757 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 09:00:41,759 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 09:00:41,759 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 09:00:41,760 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 09:00:41,760 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 09:00:41,760 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 09:00:41,761 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 09:00:41,761 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 09:00:41,762 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 09:00:41,762 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 09:00:41,763 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 09:00:41,764 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 09:00:41,764 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 09:00:41,764 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 09:00:41,765 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 09:00:41,765 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 09:00:41,766 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 09:00:41,766 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 09:00:41,767 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 09:00:41,798 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 09:00:41,798 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 09:00:41,798 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 09:00:41,798 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 09:00:41,799 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 09:00:41,799 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 09:00:41,799 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 09:00:41,800 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 09:00:41,800 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 09:00:41,800 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 09:00:41,800 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 09:00:41,800 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 09:00:41,800 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 09:00:41,800 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 09:00:41,800 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 09:00:41,800 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 09:00:41,801 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 09:00:41,801 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 09:00:41,801 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 09:00:41,801 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 09:00:41,801 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 09:00:41,801 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 09:00:41,801 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:00:41,801 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 09:00:41,801 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 09:00:41,801 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 09:00:41,802 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 09:00:41,802 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 09:00:41,802 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 09:00:41,802 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 09:00:41,802 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 81c3a4bcb7df13b97375e2abc10c6fdc1a8edbd3 [2021-08-26 09:00:42,068 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 09:00:42,082 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 09:00:42,084 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 09:00:42,086 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 09:00:42,086 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 09:00:42,087 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2021-08-26 09:00:42,135 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05974732e/19ba68b5472841fc9dcba51304822d66/FLAG1ac1e01c1 [2021-08-26 09:00:42,496 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 09:00:42,496 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2021-08-26 09:00:42,501 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05974732e/19ba68b5472841fc9dcba51304822d66/FLAG1ac1e01c1 [2021-08-26 09:00:42,512 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05974732e/19ba68b5472841fc9dcba51304822d66 [2021-08-26 09:00:42,515 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 09:00:42,517 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 09:00:42,518 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 09:00:42,518 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 09:00:42,520 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 09:00:42,521 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,521 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@520a2a94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42, skipping insertion in model container [2021-08-26 09:00:42,521 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,526 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 09:00:42,537 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 09:00:42,645 WARN L228 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_i15_o15-2.c[454,467] [2021-08-26 09:00:42,647 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:00:42,654 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 09:00:42,663 WARN L228 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_i15_o15-2.c[454,467] [2021-08-26 09:00:42,663 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:00:42,671 INFO L208 MainTranslator]: Completed translation [2021-08-26 09:00:42,671 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42 WrapperNode [2021-08-26 09:00:42,672 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 09:00:42,673 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 09:00:42,673 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 09:00:42,673 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 09:00:42,678 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,683 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,694 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 09:00:42,695 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 09:00:42,695 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 09:00:42,695 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 09:00:42,722 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,729 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,729 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,733 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,734 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,738 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,739 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 09:00:42,740 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 09:00:42,740 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 09:00:42,740 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 09:00:42,741 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (1/1) ... [2021-08-26 09:00:42,745 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:00:42,750 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:42,759 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) [2021-08-26 09:00:42,767 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 [2021-08-26 09:00:42,793 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 09:00:42,794 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 09:00:42,794 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 09:00:42,794 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-08-26 09:00:42,795 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-08-26 09:00:42,795 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 09:00:43,011 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 09:00:43,011 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-26 09:00:43,012 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:00:43 BoogieIcfgContainer [2021-08-26 09:00:43,013 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 09:00:43,014 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 09:00:43,014 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 09:00:43,016 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 09:00:43,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 09:00:42" (1/3) ... [2021-08-26 09:00:43,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d1ba3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:00:43, skipping insertion in model container [2021-08-26 09:00:43,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:00:42" (2/3) ... [2021-08-26 09:00:43,018 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15d1ba3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:00:43, skipping insertion in model container [2021-08-26 09:00:43,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:00:43" (3/3) ... [2021-08-26 09:00:43,019 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2021-08-26 09:00:43,023 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 09:00:43,023 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 09:00:43,060 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 09:00:43,066 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, mConcurrency=FINITE_AUTOMATA, 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 [2021-08-26 09:00:43,066 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 09:00:43,085 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) [2021-08-26 09:00:43,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 09:00:43,088 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:43,089 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:43,089 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:43,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:43,093 INFO L82 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2021-08-26 09:00:43,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:43,101 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413582331] [2021-08-26 09:00:43,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:43,102 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:43,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:43,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:43,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:43,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 09:00:43,306 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:43,306 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413582331] [2021-08-26 09:00:43,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413582331] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:00:43,307 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:00:43,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 09:00:43,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145276268] [2021-08-26 09:00:43,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 09:00:43,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:43,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 09:00:43,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:00:43,325 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) [2021-08-26 09:00:43,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:43,378 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-08-26 09:00:43,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 09:00:43,380 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 [2021-08-26 09:00:43,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:43,384 INFO L225 Difference]: With dead ends: 25 [2021-08-26 09:00:43,384 INFO L226 Difference]: Without dead ends: 15 [2021-08-26 09:00:43,386 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-08-26 09:00:43,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-08-26 09:00:43,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-08-26 09:00:43,413 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) [2021-08-26 09:00:43,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-08-26 09:00:43,415 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-08-26 09:00:43,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:43,416 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-08-26 09:00:43,416 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) [2021-08-26 09:00:43,416 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-08-26 09:00:43,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-26 09:00:43,417 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:43,417 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:43,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 09:00:43,418 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:43,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:43,420 INFO L82 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2021-08-26 09:00:43,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:43,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889422269] [2021-08-26 09:00:43,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:43,421 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:43,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:43,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:43,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:43,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:43,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:43,571 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:00:43,573 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:43,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889422269] [2021-08-26 09:00:43,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889422269] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:43,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580953052] [2021-08-26 09:00:43,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:43,574 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:43,574 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:43,577 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) [2021-08-26 09:00:43,579 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-26 09:00:43,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:43,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-26 09:00:43,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:43,822 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:00:43,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580953052] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:43,822 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:43,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2021-08-26 09:00:43,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925366079] [2021-08-26 09:00:43,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-26 09:00:43,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:43,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-26 09:00:43,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-08-26 09:00:43,825 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 9 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-26 09:00:43,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:43,883 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-08-26 09:00:43,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-26 09:00:43,884 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 9 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) Word has length 16 [2021-08-26 09:00:43,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:43,884 INFO L225 Difference]: With dead ends: 22 [2021-08-26 09:00:43,885 INFO L226 Difference]: Without dead ends: 18 [2021-08-26 09:00:43,885 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 72.3ms TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-08-26 09:00:43,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-08-26 09:00:43,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-08-26 09:00:43,889 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) [2021-08-26 09:00:43,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-08-26 09:00:43,889 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2021-08-26 09:00:43,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:43,890 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-08-26 09:00:43,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 9 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-26 09:00:43,890 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-08-26 09:00:43,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-26 09:00:43,891 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:43,891 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:43,938 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:44,109 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 [2021-08-26 09:00:44,110 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:44,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:44,110 INFO L82 PathProgramCache]: Analyzing trace with hash -41010676, now seen corresponding path program 2 times [2021-08-26 09:00:44,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:44,110 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738317802] [2021-08-26 09:00:44,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:44,111 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:44,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:44,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:44,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:44,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,207 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-26 09:00:44,207 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:44,208 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738317802] [2021-08-26 09:00:44,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738317802] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:44,208 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059490954] [2021-08-26 09:00:44,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:00:44,208 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:44,208 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:44,209 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) [2021-08-26 09:00:44,210 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-26 09:00:44,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:00:44,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:44,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-26 09:00:44,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:44,344 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-26 09:00:44,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059490954] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:44,344 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:44,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-08-26 09:00:44,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951172688] [2021-08-26 09:00:44,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-26 09:00:44,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:44,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-26 09:00:44,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-08-26 09:00:44,345 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 10 states have internal predecessors, (18), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) [2021-08-26 09:00:44,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:44,387 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-08-26 09:00:44,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-26 09:00:44,387 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 10 states have internal predecessors, (18), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) Word has length 22 [2021-08-26 09:00:44,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:44,388 INFO L225 Difference]: With dead ends: 25 [2021-08-26 09:00:44,388 INFO L226 Difference]: Without dead ends: 21 [2021-08-26 09:00:44,389 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 54.9ms TimeCoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-08-26 09:00:44,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-26 09:00:44,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-26 09:00:44,391 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) [2021-08-26 09:00:44,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-08-26 09:00:44,392 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2021-08-26 09:00:44,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:44,392 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-08-26 09:00:44,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 10 states have internal predecessors, (18), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) [2021-08-26 09:00:44,393 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-08-26 09:00:44,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-08-26 09:00:44,393 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:44,394 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:44,415 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:44,609 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 [2021-08-26 09:00:44,609 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:44,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:44,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 3 times [2021-08-26 09:00:44,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:44,610 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154571370] [2021-08-26 09:00:44,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:44,610 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:44,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:44,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:44,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:44,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:44,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:44,734 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-26 09:00:44,734 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:44,734 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154571370] [2021-08-26 09:00:44,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154571370] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:44,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545645238] [2021-08-26 09:00:44,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 09:00:44,735 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:44,735 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:44,737 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) [2021-08-26 09:00:44,745 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-26 09:00:44,815 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-08-26 09:00:44,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:44,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-26 09:00:44,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:44,959 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-26 09:00:44,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [545645238] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:44,959 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:44,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 17 [2021-08-26 09:00:44,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785062430] [2021-08-26 09:00:44,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-08-26 09:00:44,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:44,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-08-26 09:00:44,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2021-08-26 09:00:44,961 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 17 states, 16 states have (on average 1.75) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 1 states have call predecessors, (4), 8 states have return successors, (8), 8 states have call predecessors, (8), 3 states have call successors, (8) [2021-08-26 09:00:45,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:45,107 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-08-26 09:00:45,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-26 09:00:45,107 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.75) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 1 states have call predecessors, (4), 8 states have return successors, (8), 8 states have call predecessors, (8), 3 states have call successors, (8) Word has length 28 [2021-08-26 09:00:45,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:45,109 INFO L225 Difference]: With dead ends: 28 [2021-08-26 09:00:45,110 INFO L226 Difference]: Without dead ends: 24 [2021-08-26 09:00:45,110 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 160.4ms TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2021-08-26 09:00:45,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-08-26 09:00:45,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-08-26 09:00:45,113 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) [2021-08-26 09:00:45,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-08-26 09:00:45,114 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 28 [2021-08-26 09:00:45,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:45,114 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-08-26 09:00:45,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.75) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 1 states have call predecessors, (4), 8 states have return successors, (8), 8 states have call predecessors, (8), 3 states have call successors, (8) [2021-08-26 09:00:45,114 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-08-26 09:00:45,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-08-26 09:00:45,115 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:45,115 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:45,131 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:45,323 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 [2021-08-26 09:00:45,323 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:45,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:45,324 INFO L82 PathProgramCache]: Analyzing trace with hash 371264716, now seen corresponding path program 4 times [2021-08-26 09:00:45,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:45,324 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629043585] [2021-08-26 09:00:45,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:45,324 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:45,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,342 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,383 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,398 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,408 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-08-26 09:00:45,408 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:45,408 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629043585] [2021-08-26 09:00:45,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629043585] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:45,409 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755168397] [2021-08-26 09:00:45,409 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 09:00:45,409 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:45,409 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:45,414 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) [2021-08-26 09:00:45,428 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-26 09:00:45,468 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 09:00:45,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:45,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-26 09:00:45,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:45,580 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-08-26 09:00:45,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755168397] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:45,580 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:45,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-08-26 09:00:45,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959329996] [2021-08-26 09:00:45,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-26 09:00:45,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:45,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-26 09:00:45,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2021-08-26 09:00:45,581 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 12 states, 10 states have (on average 2.2) internal successors, (22), 12 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 6 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-08-26 09:00:45,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:45,627 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-08-26 09:00:45,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-26 09:00:45,628 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.2) internal successors, (22), 12 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 6 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 34 [2021-08-26 09:00:45,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:45,629 INFO L225 Difference]: With dead ends: 31 [2021-08-26 09:00:45,629 INFO L226 Difference]: Without dead ends: 27 [2021-08-26 09:00:45,629 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 59.7ms TimeCoverageRelationStatistics Valid=84, Invalid=188, Unknown=0, NotChecked=0, Total=272 [2021-08-26 09:00:45,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-26 09:00:45,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-08-26 09:00:45,631 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) [2021-08-26 09:00:45,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-08-26 09:00:45,632 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 34 [2021-08-26 09:00:45,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:45,632 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-08-26 09:00:45,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.2) internal successors, (22), 12 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 6 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-08-26 09:00:45,632 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-08-26 09:00:45,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-08-26 09:00:45,633 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:45,633 INFO L512 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:45,659 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-08-26 09:00:45,852 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 [2021-08-26 09:00:45,853 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:45,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:45,853 INFO L82 PathProgramCache]: Analyzing trace with hash -886339242, now seen corresponding path program 5 times [2021-08-26 09:00:45,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:45,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318324919] [2021-08-26 09:00:45,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:45,854 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:45,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,882 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,965 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:45,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:45,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,014 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,025 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,034 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-08-26 09:00:46,035 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:46,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318324919] [2021-08-26 09:00:46,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1318324919] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:46,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282043430] [2021-08-26 09:00:46,035 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 09:00:46,035 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:46,036 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:46,036 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) [2021-08-26 09:00:46,041 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-26 09:00:46,112 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-08-26 09:00:46,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:46,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 14 conjunts are in the unsatisfiable core [2021-08-26 09:00:46,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:46,278 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-08-26 09:00:46,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282043430] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:46,278 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:46,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2021-08-26 09:00:46,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951769232] [2021-08-26 09:00:46,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-26 09:00:46,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:46,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-26 09:00:46,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-08-26 09:00:46,283 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 13 states have internal predecessors, (24), 4 states have call successors, (4), 1 states have call predecessors, (4), 7 states have return successors, (12), 6 states have call predecessors, (12), 4 states have call successors, (12) [2021-08-26 09:00:46,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:46,347 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-08-26 09:00:46,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-26 09:00:46,348 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), 4 states have call successors, (4), 1 states have call predecessors, (4), 7 states have return successors, (12), 6 states have call predecessors, (12), 4 states have call successors, (12) Word has length 40 [2021-08-26 09:00:46,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:46,348 INFO L225 Difference]: With dead ends: 34 [2021-08-26 09:00:46,349 INFO L226 Difference]: Without dead ends: 30 [2021-08-26 09:00:46,349 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 95.1ms TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2021-08-26 09:00:46,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-08-26 09:00:46,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-08-26 09:00:46,351 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) [2021-08-26 09:00:46,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-08-26 09:00:46,352 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 40 [2021-08-26 09:00:46,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:46,352 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-08-26 09:00:46,352 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), 4 states have call successors, (4), 1 states have call predecessors, (4), 7 states have return successors, (12), 6 states have call predecessors, (12), 4 states have call successors, (12) [2021-08-26 09:00:46,352 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-08-26 09:00:46,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-08-26 09:00:46,353 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:46,353 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:46,371 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:46,560 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 [2021-08-26 09:00:46,561 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:46,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:46,561 INFO L82 PathProgramCache]: Analyzing trace with hash -918712436, now seen corresponding path program 6 times [2021-08-26 09:00:46,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:46,561 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392236276] [2021-08-26 09:00:46,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:46,562 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:46,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,655 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:46,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:46,666 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-08-26 09:00:46,666 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:46,666 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392236276] [2021-08-26 09:00:46,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392236276] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:46,666 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998414764] [2021-08-26 09:00:46,666 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-26 09:00:46,666 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:46,666 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:46,677 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) [2021-08-26 09:00:46,682 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-26 09:00:46,785 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-08-26 09:00:46,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:46,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 16 conjunts are in the unsatisfiable core [2021-08-26 09:00:46,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:47,139 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-08-26 09:00:47,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998414764] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:47,140 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:47,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 26 [2021-08-26 09:00:47,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317043655] [2021-08-26 09:00:47,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-08-26 09:00:47,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:47,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-08-26 09:00:47,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2021-08-26 09:00:47,141 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 26 states, 25 states have (on average 1.6) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 1 states have call predecessors, (4), 14 states have return successors, (14), 14 states have call predecessors, (14), 3 states have call successors, (14) [2021-08-26 09:00:47,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:47,385 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-08-26 09:00:47,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-26 09:00:47,385 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.6) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 1 states have call predecessors, (4), 14 states have return successors, (14), 14 states have call predecessors, (14), 3 states have call successors, (14) Word has length 46 [2021-08-26 09:00:47,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:47,386 INFO L225 Difference]: With dead ends: 37 [2021-08-26 09:00:47,386 INFO L226 Difference]: Without dead ends: 33 [2021-08-26 09:00:47,387 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 407.1ms TimeCoverageRelationStatistics Valid=279, Invalid=1203, Unknown=0, NotChecked=0, Total=1482 [2021-08-26 09:00:47,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-08-26 09:00:47,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-08-26 09:00:47,389 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) [2021-08-26 09:00:47,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-08-26 09:00:47,390 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 46 [2021-08-26 09:00:47,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:47,390 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-08-26 09:00:47,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.6) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 1 states have call predecessors, (4), 14 states have return successors, (14), 14 states have call predecessors, (14), 3 states have call successors, (14) [2021-08-26 09:00:47,390 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-08-26 09:00:47,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-08-26 09:00:47,391 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:47,391 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:47,409 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:47,601 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 [2021-08-26 09:00:47,601 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:47,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:47,602 INFO L82 PathProgramCache]: Analyzing trace with hash -626238314, now seen corresponding path program 7 times [2021-08-26 09:00:47,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:47,602 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072662035] [2021-08-26 09:00:47,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:47,602 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:47,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,625 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:47,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:47,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:47,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:47,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:47,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,705 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:47,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,717 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:47,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:47,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,743 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-26 09:00:47,743 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:47,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072662035] [2021-08-26 09:00:47,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072662035] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:47,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588423223] [2021-08-26 09:00:47,744 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-26 09:00:47,744 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:47,744 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:47,745 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) [2021-08-26 09:00:47,749 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-26 09:00:47,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:47,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2021-08-26 09:00:47,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:48,030 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-26 09:00:48,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588423223] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:48,030 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:48,030 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 15 [2021-08-26 09:00:48,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558376732] [2021-08-26 09:00:48,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-08-26 09:00:48,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:48,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-08-26 09:00:48,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=145, Unknown=0, NotChecked=0, Total=210 [2021-08-26 09:00:48,032 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 4 states have call successors, (4), 1 states have call predecessors, (4), 9 states have return successors, (16), 8 states have call predecessors, (16), 4 states have call successors, (16) [2021-08-26 09:00:48,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:48,124 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2021-08-26 09:00:48,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-26 09:00:48,125 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), 4 states have call successors, (4), 1 states have call predecessors, (4), 9 states have return successors, (16), 8 states have call predecessors, (16), 4 states have call successors, (16) Word has length 52 [2021-08-26 09:00:48,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:48,126 INFO L225 Difference]: With dead ends: 40 [2021-08-26 09:00:48,126 INFO L226 Difference]: Without dead ends: 36 [2021-08-26 09:00:48,126 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 112.1ms TimeCoverageRelationStatistics Valid=162, Invalid=344, Unknown=0, NotChecked=0, Total=506 [2021-08-26 09:00:48,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-08-26 09:00:48,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-08-26 09:00:48,129 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) [2021-08-26 09:00:48,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-08-26 09:00:48,129 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 52 [2021-08-26 09:00:48,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:48,130 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-08-26 09:00:48,130 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), 4 states have call successors, (4), 1 states have call predecessors, (4), 9 states have return successors, (16), 8 states have call predecessors, (16), 4 states have call successors, (16) [2021-08-26 09:00:48,130 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-08-26 09:00:48,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-08-26 09:00:48,131 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:48,131 INFO L512 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:48,150 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:48,341 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 [2021-08-26 09:00:48,342 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:48,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:48,342 INFO L82 PathProgramCache]: Analyzing trace with hash -960511412, now seen corresponding path program 8 times [2021-08-26 09:00:48,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:48,342 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930993250] [2021-08-26 09:00:48,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:48,343 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:48,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,451 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:48,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:48,500 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-26 09:00:48,500 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:48,500 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930993250] [2021-08-26 09:00:48,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930993250] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:48,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807606367] [2021-08-26 09:00:48,501 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:00:48,501 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:48,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:48,502 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) [2021-08-26 09:00:48,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-08-26 09:00:48,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:00:48,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:48,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2021-08-26 09:00:48,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:48,837 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-26 09:00:48,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807606367] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:48,837 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:48,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 16 [2021-08-26 09:00:48,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488644646] [2021-08-26 09:00:48,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-08-26 09:00:48,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:48,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-08-26 09:00:48,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2021-08-26 09:00:48,838 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 4 states have call successors, (4), 1 states have call predecessors, (4), 10 states have return successors, (18), 9 states have call predecessors, (18), 4 states have call successors, (18) [2021-08-26 09:00:48,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:48,944 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2021-08-26 09:00:48,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-26 09:00:48,945 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 4 states have call successors, (4), 1 states have call predecessors, (4), 10 states have return successors, (18), 9 states have call predecessors, (18), 4 states have call successors, (18) Word has length 58 [2021-08-26 09:00:48,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:48,947 INFO L225 Difference]: With dead ends: 43 [2021-08-26 09:00:48,948 INFO L226 Difference]: Without dead ends: 39 [2021-08-26 09:00:48,948 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 127.1ms TimeCoverageRelationStatistics Valid=194, Invalid=406, Unknown=0, NotChecked=0, Total=600 [2021-08-26 09:00:48,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-08-26 09:00:48,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-08-26 09:00:48,959 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) [2021-08-26 09:00:48,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-08-26 09:00:48,961 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 58 [2021-08-26 09:00:48,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:48,962 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-08-26 09:00:48,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.142857142857143) internal successors, (30), 16 states have internal predecessors, (30), 4 states have call successors, (4), 1 states have call predecessors, (4), 10 states have return successors, (18), 9 states have call predecessors, (18), 4 states have call successors, (18) [2021-08-26 09:00:48,962 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-08-26 09:00:48,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-08-26 09:00:48,965 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:48,966 INFO L512 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:48,984 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:49,176 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 [2021-08-26 09:00:49,177 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:49,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:49,177 INFO L82 PathProgramCache]: Analyzing trace with hash -366706730, now seen corresponding path program 9 times [2021-08-26 09:00:49,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:49,177 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010503984] [2021-08-26 09:00:49,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:49,178 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:49,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,333 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,345 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:49,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:49,371 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-08-26 09:00:49,371 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:49,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010503984] [2021-08-26 09:00:49,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010503984] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:49,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533859237] [2021-08-26 09:00:49,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 09:00:49,372 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:49,372 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:49,373 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) [2021-08-26 09:00:49,374 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-08-26 09:00:49,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-08-26 09:00:49,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:49,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 22 conjunts are in the unsatisfiable core [2021-08-26 09:00:49,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:49,948 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-08-26 09:00:49,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533859237] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:49,948 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:49,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 35 [2021-08-26 09:00:49,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832229000] [2021-08-26 09:00:49,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-08-26 09:00:49,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:49,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-08-26 09:00:49,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=997, Unknown=0, NotChecked=0, Total=1190 [2021-08-26 09:00:49,954 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 1 states have call predecessors, (4), 20 states have return successors, (20), 20 states have call predecessors, (20), 3 states have call successors, (20) [2021-08-26 09:00:50,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:50,263 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2021-08-26 09:00:50,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-08-26 09:00:50,263 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 1 states have call predecessors, (4), 20 states have return successors, (20), 20 states have call predecessors, (20), 3 states have call successors, (20) Word has length 64 [2021-08-26 09:00:50,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:50,264 INFO L225 Difference]: With dead ends: 46 [2021-08-26 09:00:50,264 INFO L226 Difference]: Without dead ends: 42 [2021-08-26 09:00:50,265 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 545.2ms TimeCoverageRelationStatistics Valid=531, Invalid=2331, Unknown=0, NotChecked=0, Total=2862 [2021-08-26 09:00:50,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-08-26 09:00:50,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-08-26 09:00:50,268 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) [2021-08-26 09:00:50,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-08-26 09:00:50,268 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 64 [2021-08-26 09:00:50,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:50,268 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-08-26 09:00:50,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 1 states have call predecessors, (4), 20 states have return successors, (20), 20 states have call predecessors, (20), 3 states have call successors, (20) [2021-08-26 09:00:50,269 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-08-26 09:00:50,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-08-26 09:00:50,269 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:50,270 INFO L512 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:50,292 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:50,476 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 [2021-08-26 09:00:50,477 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:50,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:50,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1719425780, now seen corresponding path program 10 times [2021-08-26 09:00:50,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:50,477 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304740678] [2021-08-26 09:00:50,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:50,478 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:50,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,502 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,524 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,592 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:50,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:50,748 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-08-26 09:00:50,748 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:50,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304740678] [2021-08-26 09:00:50,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304740678] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:50,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530792652] [2021-08-26 09:00:50,750 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 09:00:50,750 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:50,750 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:50,753 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) [2021-08-26 09:00:50,819 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-08-26 09:00:50,988 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 09:00:50,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:50,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 24 conjunts are in the unsatisfiable core [2021-08-26 09:00:50,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:51,260 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-08-26 09:00:51,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530792652] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:51,261 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:51,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 18 [2021-08-26 09:00:51,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865164161] [2021-08-26 09:00:51,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-26 09:00:51,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:51,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-26 09:00:51,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2021-08-26 09:00:51,262 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 18 states, 16 states have (on average 2.125) internal successors, (34), 18 states have internal predecessors, (34), 4 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (22), 11 states have call predecessors, (22), 4 states have call successors, (22) [2021-08-26 09:00:51,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:51,364 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2021-08-26 09:00:51,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-08-26 09:00:51,364 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.125) internal successors, (34), 18 states have internal predecessors, (34), 4 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (22), 11 states have call predecessors, (22), 4 states have call successors, (22) Word has length 70 [2021-08-26 09:00:51,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:51,365 INFO L225 Difference]: With dead ends: 49 [2021-08-26 09:00:51,365 INFO L226 Difference]: Without dead ends: 45 [2021-08-26 09:00:51,366 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 187.6ms TimeCoverageRelationStatistics Valid=267, Invalid=545, Unknown=0, NotChecked=0, Total=812 [2021-08-26 09:00:51,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-08-26 09:00:51,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-08-26 09:00:51,368 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) [2021-08-26 09:00:51,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-08-26 09:00:51,369 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 70 [2021-08-26 09:00:51,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:51,369 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-08-26 09:00:51,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.125) internal successors, (34), 18 states have internal predecessors, (34), 4 states have call successors, (4), 1 states have call predecessors, (4), 12 states have return successors, (22), 11 states have call predecessors, (22), 4 states have call successors, (22) [2021-08-26 09:00:51,370 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-08-26 09:00:51,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-08-26 09:00:51,370 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:51,370 INFO L512 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:51,389 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:51,580 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 [2021-08-26 09:00:51,581 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:51,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:51,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1354232598, now seen corresponding path program 11 times [2021-08-26 09:00:51,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:51,581 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609408202] [2021-08-26 09:00:51,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:51,581 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:51,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,649 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,681 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:51,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:51,782 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-08-26 09:00:51,783 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:51,783 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609408202] [2021-08-26 09:00:51,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609408202] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:51,783 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642656583] [2021-08-26 09:00:51,783 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 09:00:51,783 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:51,783 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:51,784 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) [2021-08-26 09:00:51,785 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-08-26 09:00:51,983 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-08-26 09:00:51,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:51,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 26 conjunts are in the unsatisfiable core [2021-08-26 09:00:51,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:52,248 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-08-26 09:00:52,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1642656583] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:52,249 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:52,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 19 [2021-08-26 09:00:52,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493449139] [2021-08-26 09:00:52,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-08-26 09:00:52,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:52,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-08-26 09:00:52,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2021-08-26 09:00:52,250 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 19 states have internal predecessors, (36), 4 states have call successors, (4), 1 states have call predecessors, (4), 13 states have return successors, (24), 12 states have call predecessors, (24), 4 states have call successors, (24) [2021-08-26 09:00:52,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:52,368 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2021-08-26 09:00:52,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-08-26 09:00:52,368 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), 4 states have call successors, (4), 1 states have call predecessors, (4), 13 states have return successors, (24), 12 states have call predecessors, (24), 4 states have call successors, (24) Word has length 76 [2021-08-26 09:00:52,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:52,369 INFO L225 Difference]: With dead ends: 52 [2021-08-26 09:00:52,369 INFO L226 Difference]: Without dead ends: 48 [2021-08-26 09:00:52,369 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 190.0ms TimeCoverageRelationStatistics Valid=308, Invalid=622, Unknown=0, NotChecked=0, Total=930 [2021-08-26 09:00:52,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-08-26 09:00:52,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-08-26 09:00:52,372 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) [2021-08-26 09:00:52,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-08-26 09:00:52,373 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 76 [2021-08-26 09:00:52,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:52,373 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-08-26 09:00:52,373 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), 4 states have call successors, (4), 1 states have call predecessors, (4), 13 states have return successors, (24), 12 states have call predecessors, (24), 4 states have call successors, (24) [2021-08-26 09:00:52,373 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-08-26 09:00:52,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-08-26 09:00:52,374 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:52,374 INFO L512 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:52,396 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:52,592 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 [2021-08-26 09:00:52,592 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:52,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:52,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1734686668, now seen corresponding path program 12 times [2021-08-26 09:00:52,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:52,593 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771219334] [2021-08-26 09:00:52,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:52,593 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:52,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,782 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,796 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:52,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:52,846 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-08-26 09:00:52,846 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:52,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771219334] [2021-08-26 09:00:52,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771219334] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:52,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460277715] [2021-08-26 09:00:52,847 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-26 09:00:52,847 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:52,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:52,848 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) [2021-08-26 09:00:52,849 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-08-26 09:00:53,074 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-08-26 09:00:53,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:53,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 28 conjunts are in the unsatisfiable core [2021-08-26 09:00:53,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:53,326 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-08-26 09:00:53,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460277715] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:53,327 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:53,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 20 [2021-08-26 09:00:53,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183597716] [2021-08-26 09:00:53,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-08-26 09:00:53,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:53,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-08-26 09:00:53,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=250, Unknown=0, NotChecked=0, Total=380 [2021-08-26 09:00:53,328 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 20 states have internal predecessors, (38), 4 states have call successors, (4), 1 states have call predecessors, (4), 14 states have return successors, (26), 13 states have call predecessors, (26), 4 states have call successors, (26) [2021-08-26 09:00:53,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:53,471 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2021-08-26 09:00:53,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-26 09:00:53,472 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 20 states have internal predecessors, (38), 4 states have call successors, (4), 1 states have call predecessors, (4), 14 states have return successors, (26), 13 states have call predecessors, (26), 4 states have call successors, (26) Word has length 82 [2021-08-26 09:00:53,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:53,473 INFO L225 Difference]: With dead ends: 55 [2021-08-26 09:00:53,473 INFO L226 Difference]: Without dead ends: 51 [2021-08-26 09:00:53,473 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 188.5ms TimeCoverageRelationStatistics Valid=352, Invalid=704, Unknown=0, NotChecked=0, Total=1056 [2021-08-26 09:00:53,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-08-26 09:00:53,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-08-26 09:00:53,476 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) [2021-08-26 09:00:53,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-08-26 09:00:53,476 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 82 [2021-08-26 09:00:53,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:53,477 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-08-26 09:00:53,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 20 states have internal predecessors, (38), 4 states have call successors, (4), 1 states have call predecessors, (4), 14 states have return successors, (26), 13 states have call predecessors, (26), 4 states have call successors, (26) [2021-08-26 09:00:53,477 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-08-26 09:00:53,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-08-26 09:00:53,478 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:53,478 INFO L512 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:53,497 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:53,681 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 [2021-08-26 09:00:53,681 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:53,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:53,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1433749930, now seen corresponding path program 13 times [2021-08-26 09:00:53,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:53,682 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420881329] [2021-08-26 09:00:53,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:53,682 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:53,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,739 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,780 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,831 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:53,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:53,961 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-08-26 09:00:53,961 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:53,962 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420881329] [2021-08-26 09:00:53,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420881329] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:53,962 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485253337] [2021-08-26 09:00:53,962 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-26 09:00:53,962 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:53,962 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:53,963 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) [2021-08-26 09:00:53,986 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-08-26 09:00:54,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:54,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 30 conjunts are in the unsatisfiable core [2021-08-26 09:00:54,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:54,530 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-08-26 09:00:54,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485253337] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:54,530 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:54,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 21 [2021-08-26 09:00:54,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834298204] [2021-08-26 09:00:54,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-08-26 09:00:54,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:54,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-08-26 09:00:54,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=274, Unknown=0, NotChecked=0, Total=420 [2021-08-26 09:00:54,532 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 21 states have internal predecessors, (40), 4 states have call successors, (4), 1 states have call predecessors, (4), 15 states have return successors, (28), 14 states have call predecessors, (28), 4 states have call successors, (28) [2021-08-26 09:00:54,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:54,666 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2021-08-26 09:00:54,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-08-26 09:00:54,667 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), 4 states have call successors, (4), 1 states have call predecessors, (4), 15 states have return successors, (28), 14 states have call predecessors, (28), 4 states have call successors, (28) Word has length 88 [2021-08-26 09:00:54,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:54,667 INFO L225 Difference]: With dead ends: 58 [2021-08-26 09:00:54,667 INFO L226 Difference]: Without dead ends: 54 [2021-08-26 09:00:54,668 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 192.0ms TimeCoverageRelationStatistics Valid=399, Invalid=791, Unknown=0, NotChecked=0, Total=1190 [2021-08-26 09:00:54,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-08-26 09:00:54,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-08-26 09:00:54,670 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) [2021-08-26 09:00:54,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-08-26 09:00:54,671 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 88 [2021-08-26 09:00:54,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:54,671 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-08-26 09:00:54,671 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), 4 states have call successors, (4), 1 states have call predecessors, (4), 15 states have return successors, (28), 14 states have call predecessors, (28), 4 states have call successors, (28) [2021-08-26 09:00:54,671 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-08-26 09:00:54,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-08-26 09:00:54,672 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:54,672 INFO L512 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:54,696 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:54,881 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 [2021-08-26 09:00:54,881 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:54,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:54,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1321174388, now seen corresponding path program 14 times [2021-08-26 09:00:54,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:54,882 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879445924] [2021-08-26 09:00:54,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:54,882 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:54,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:54,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:54,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:54,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:54,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:54,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:54,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:54,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:54,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:54,985 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:54,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,075 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,091 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,119 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:00:55,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:00:55,169 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-08-26 09:00:55,169 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:00:55,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879445924] [2021-08-26 09:00:55,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879445924] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:55,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761442054] [2021-08-26 09:00:55,170 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:00:55,170 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:00:55,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:00:55,171 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) [2021-08-26 09:00:55,172 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-08-26 09:00:55,463 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:00:55,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:00:55,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 32 conjunts are in the unsatisfiable core [2021-08-26 09:00:55,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:00:55,746 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-08-26 09:00:55,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1761442054] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:00:55,746 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:00:55,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 22 [2021-08-26 09:00:55,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312378948] [2021-08-26 09:00:55,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-08-26 09:00:55,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:00:55,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-08-26 09:00:55,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=299, Unknown=0, NotChecked=0, Total=462 [2021-08-26 09:00:55,749 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 22 states, 20 states have (on average 2.1) internal successors, (42), 22 states have internal predecessors, (42), 4 states have call successors, (4), 1 states have call predecessors, (4), 16 states have return successors, (30), 15 states have call predecessors, (30), 4 states have call successors, (30) [2021-08-26 09:00:55,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:00:55,872 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2021-08-26 09:00:55,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-08-26 09:00:55,872 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 2.1) internal successors, (42), 22 states have internal predecessors, (42), 4 states have call successors, (4), 1 states have call predecessors, (4), 16 states have return successors, (30), 15 states have call predecessors, (30), 4 states have call successors, (30) Word has length 94 [2021-08-26 09:00:55,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:00:55,873 INFO L225 Difference]: With dead ends: 61 [2021-08-26 09:00:55,873 INFO L226 Difference]: Without dead ends: 57 [2021-08-26 09:00:55,873 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 201.5ms TimeCoverageRelationStatistics Valid=449, Invalid=883, Unknown=0, NotChecked=0, Total=1332 [2021-08-26 09:00:55,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-08-26 09:00:55,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-08-26 09:00:55,878 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) [2021-08-26 09:00:55,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-08-26 09:00:55,878 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 94 [2021-08-26 09:00:55,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:00:55,879 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-08-26 09:00:55,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 2.1) internal successors, (42), 22 states have internal predecessors, (42), 4 states have call successors, (4), 1 states have call predecessors, (4), 16 states have return successors, (30), 15 states have call predecessors, (30), 4 states have call successors, (30) [2021-08-26 09:00:55,879 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-08-26 09:00:55,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-08-26 09:00:55,879 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:00:55,880 INFO L512 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:00:55,897 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-08-26 09:00:56,092 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 [2021-08-26 09:00:56,093 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:00:56,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:00:56,093 INFO L82 PathProgramCache]: Analyzing trace with hash 415287702, now seen corresponding path program 15 times [2021-08-26 09:00:56,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:00:56,093 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773917807] [2021-08-26 09:00:56,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:00:56,093 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:00:56,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:00:56,117 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 09:00:56,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:00:56,146 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 09:00:56,147 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 09:00:56,147 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 09:00:56,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-08-26 09:00:56,154 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 09:00:56,205 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 09:00:56 BoogieIcfgContainer [2021-08-26 09:00:56,206 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 09:00:56,206 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 09:00:56,206 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 09:00:56,206 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 09:00:56,207 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:00:43" (3/4) ... [2021-08-26 09:00:56,208 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 09:00:56,249 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 09:00:56,250 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 09:00:56,251 INFO L168 Benchmark]: Toolchain (without parser) took 13733.38 ms. Allocated memory was 58.7 MB in the beginning and 220.2 MB in the end (delta: 161.5 MB). Free memory was 38.1 MB in the beginning and 73.9 MB in the end (delta: -35.9 MB). Peak memory consumption was 123.8 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:56,251 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 58.7 MB. Free memory is still 41.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:00:56,252 INFO L168 Benchmark]: CACSL2BoogieTranslator took 154.69 ms. Allocated memory is still 58.7 MB. Free memory was 37.8 MB in the beginning and 28.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:56,253 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.87 ms. Allocated memory is still 58.7 MB. Free memory was 28.6 MB in the beginning and 27.3 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:56,253 INFO L168 Benchmark]: Boogie Preprocessor took 44.56 ms. Allocated memory is still 58.7 MB. Free memory was 27.2 MB in the beginning and 42.9 MB in the end (delta: -15.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:56,253 INFO L168 Benchmark]: RCFGBuilder took 272.77 ms. Allocated memory is still 58.7 MB. Free memory was 42.8 MB in the beginning and 31.4 MB in the end (delta: 11.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:56,253 INFO L168 Benchmark]: TraceAbstraction took 13191.89 ms. Allocated memory was 58.7 MB in the beginning and 220.2 MB in the end (delta: 161.5 MB). Free memory was 31.0 MB in the beginning and 79.2 MB in the end (delta: -48.2 MB). Peak memory consumption was 114.5 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:56,253 INFO L168 Benchmark]: Witness Printer took 43.59 ms. Allocated memory is still 220.2 MB. Free memory was 79.2 MB in the beginning and 73.9 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-08-26 09:00:56,255 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 58.7 MB. Free memory is still 41.0 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 154.69 ms. Allocated memory is still 58.7 MB. Free memory was 37.8 MB in the beginning and 28.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 20.87 ms. Allocated memory is still 58.7 MB. Free memory was 28.6 MB in the beginning and 27.3 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 44.56 ms. Allocated memory is still 58.7 MB. Free memory was 27.2 MB in the beginning and 42.9 MB in the end (delta: -15.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * RCFGBuilder took 272.77 ms. Allocated memory is still 58.7 MB. Free memory was 42.8 MB in the beginning and 31.4 MB in the end (delta: 11.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 13191.89 ms. Allocated memory was 58.7 MB in the beginning and 220.2 MB in the end (delta: 161.5 MB). Free memory was 31.0 MB in the beginning and 79.2 MB in the end (delta: -48.2 MB). Peak memory consumption was 114.5 MB. Max. memory is 16.1 GB. * Witness Printer took 43.59 ms. Allocated memory is still 220.2 MB. Free memory was 79.2 MB in the beginning and 73.9 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int input = 15; [L13] CALL, EXPR id(input) VAL [\old(x)=15] [L7] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L8] CALL, EXPR id(x-1) VAL [\old(x)=14] [L7] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L8] CALL, EXPR id(x-1) VAL [\old(x)=13] [L7] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L8] CALL, EXPR id(x-1) VAL [\old(x)=12] [L7] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L8] CALL, EXPR id(x-1) VAL [\old(x)=11] [L7] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L8] CALL, EXPR id(x-1) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] int result = id(input); [L14] COND TRUE result == 15 [L15] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 13092.9ms, OverallIterations: 16, TraceHistogramMax: 16, EmptinessCheckTime: 18.8ms, AutomataDifference: 1840.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 15.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 150 SDtfs, 448 SDslu, 777 SDs, 0 SdLazy, 689 SolverSat, 135 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 456.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1299 GetRequests, 933 SyntacticMatches, 0 SemanticMatches, 366 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2030 ImplicationChecksByTransitivity, 2636.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=57occurred in iteration=15, InterpolantAutomatonStates: 198, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 75.1ms AutomataMinimizationTime, 15 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 117.5ms SsaConstructionTime, 458.1ms SatisfiabilityAnalysisTime, 5689.8ms InterpolantComputationTime, 1650 NumberOfCodeBlocks, 1650 NumberOfCodeBlocksAsserted, 81 NumberOfCheckSat, 1521 ConstructedInterpolants, 0 QuantifiedInterpolants, 3781 SizeOfPredicates, 98 NumberOfNonLiveVariables, 2212 ConjunctsInSsa, 266 ConjunctsInUnsatCore, 29 InterpolantComputations, 1 PerfectInterpolantSequences, 3150/6300 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-26 09:00:56,291 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...