./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench/divbin.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version c3fed411 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/nla-digbench/divbin.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c49641164907d0e2939c5443b0376a8e4377b34a58fd804ad01c6cf7d42c55dc --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-16 00:12:25,733 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-16 00:12:25,762 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-16 00:12:25,790 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-16 00:12:25,790 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-16 00:12:25,791 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-16 00:12:25,792 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-16 00:12:25,794 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-16 00:12:25,795 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-16 00:12:25,796 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-16 00:12:25,797 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-16 00:12:25,798 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-16 00:12:25,798 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-16 00:12:25,799 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-16 00:12:25,800 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-16 00:12:25,801 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-16 00:12:25,802 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-16 00:12:25,802 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-16 00:12:25,804 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-16 00:12:25,805 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-16 00:12:25,806 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-16 00:12:25,807 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-16 00:12:25,808 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-16 00:12:25,812 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-16 00:12:25,815 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-16 00:12:25,815 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-16 00:12:25,815 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-16 00:12:25,824 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-16 00:12:25,824 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-16 00:12:25,825 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-16 00:12:25,825 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-16 00:12:25,826 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-16 00:12:25,826 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-16 00:12:25,827 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-16 00:12:25,828 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-16 00:12:25,828 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-16 00:12:25,828 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-16 00:12:25,829 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-16 00:12:25,829 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-16 00:12:25,830 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-16 00:12:25,830 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-16 00:12:25,833 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-16 00:12:25,857 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-16 00:12:25,864 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-16 00:12:25,865 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-16 00:12:25,865 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-16 00:12:25,866 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-16 00:12:25,866 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-16 00:12:25,867 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-16 00:12:25,867 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-16 00:12:25,867 INFO L138 SettingsManager]: * Use SBE=true [2021-12-16 00:12:25,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-16 00:12:25,868 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-16 00:12:25,868 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-16 00:12:25,869 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-16 00:12:25,869 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-16 00:12:25,869 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-16 00:12:25,869 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-16 00:12:25,869 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-16 00:12:25,869 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-16 00:12:25,870 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-16 00:12:25,870 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-16 00:12:25,870 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-16 00:12:25,870 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-16 00:12:25,870 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-16 00:12:25,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-16 00:12:25,871 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 00:12:25,871 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-16 00:12:25,871 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-16 00:12:25,871 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-16 00:12:25,871 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-16 00:12:25,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-16 00:12:25,872 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-16 00:12:25,872 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-16 00:12:25,872 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-16 00:12:25,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-16 00:12:25,873 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c49641164907d0e2939c5443b0376a8e4377b34a58fd804ad01c6cf7d42c55dc [2021-12-16 00:12:26,094 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-16 00:12:26,118 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-16 00:12:26,121 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-16 00:12:26,122 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-16 00:12:26,122 INFO L275 PluginConnector]: CDTParser initialized [2021-12-16 00:12:26,123 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench/divbin.i [2021-12-16 00:12:26,171 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bee068013/744be737c40b46f88397aefbe5a2b39e/FLAG94fbc98cb [2021-12-16 00:12:26,542 INFO L306 CDTParser]: Found 1 translation units. [2021-12-16 00:12:26,543 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench/divbin.i [2021-12-16 00:12:26,548 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bee068013/744be737c40b46f88397aefbe5a2b39e/FLAG94fbc98cb [2021-12-16 00:12:26,561 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bee068013/744be737c40b46f88397aefbe5a2b39e [2021-12-16 00:12:26,564 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-16 00:12:26,566 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-16 00:12:26,570 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-16 00:12:26,570 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-16 00:12:26,577 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-16 00:12:26,577 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,578 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d80985c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26, skipping insertion in model container [2021-12-16 00:12:26,578 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,584 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-16 00:12:26,599 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-16 00:12:26,743 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench/divbin.i[950,963] [2021-12-16 00:12:26,754 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 00:12:26,760 INFO L203 MainTranslator]: Completed pre-run [2021-12-16 00:12:26,769 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench/divbin.i[950,963] [2021-12-16 00:12:26,773 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 00:12:26,782 INFO L208 MainTranslator]: Completed translation [2021-12-16 00:12:26,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26 WrapperNode [2021-12-16 00:12:26,783 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-16 00:12:26,784 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-16 00:12:26,784 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-16 00:12:26,784 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-16 00:12:26,788 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,792 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,805 INFO L137 Inliner]: procedures = 16, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 45 [2021-12-16 00:12:26,806 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-16 00:12:26,806 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-16 00:12:26,806 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-16 00:12:26,807 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-16 00:12:26,813 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,813 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,814 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,815 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,817 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,820 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,821 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,822 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-16 00:12:26,823 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-16 00:12:26,823 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-16 00:12:26,823 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-16 00:12:26,824 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (1/1) ... [2021-12-16 00:12:26,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 00:12:26,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 00:12:26,860 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-16 00:12:26,873 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-16 00:12:26,895 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-16 00:12:26,895 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-16 00:12:26,896 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-16 00:12:26,896 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-16 00:12:26,896 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-16 00:12:26,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-16 00:12:26,896 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-16 00:12:26,896 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-16 00:12:26,942 INFO L236 CfgBuilder]: Building ICFG [2021-12-16 00:12:26,944 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-16 00:12:27,065 INFO L277 CfgBuilder]: Performing block encoding [2021-12-16 00:12:27,070 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-16 00:12:27,071 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-16 00:12:27,072 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 12:12:27 BoogieIcfgContainer [2021-12-16 00:12:27,072 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-16 00:12:27,074 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-16 00:12:27,074 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-16 00:12:27,076 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-16 00:12:27,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.12 12:12:26" (1/3) ... [2021-12-16 00:12:27,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e12bc09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 12:12:27, skipping insertion in model container [2021-12-16 00:12:27,077 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 12:12:26" (2/3) ... [2021-12-16 00:12:27,078 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e12bc09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 12:12:27, skipping insertion in model container [2021-12-16 00:12:27,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 12:12:27" (3/3) ... [2021-12-16 00:12:27,079 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin.i [2021-12-16 00:12:27,083 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-16 00:12:27,083 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-16 00:12:27,130 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-16 00:12:27,160 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-16 00:12:27,162 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-16 00:12:27,181 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 00:12:27,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-16 00:12:27,187 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 00:12:27,187 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 00:12:27,188 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 00:12:27,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 00:12:27,192 INFO L85 PathProgramCache]: Analyzing trace with hash 1992670790, now seen corresponding path program 1 times [2021-12-16 00:12:27,199 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 00:12:27,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246337365] [2021-12-16 00:12:27,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:27,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 00:12:27,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 00:12:27,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-16 00:12:27,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 00:12:27,337 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-16 00:12:27,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 00:12:27,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 00:12:27,347 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 00:12:27,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246337365] [2021-12-16 00:12:27,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246337365] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 00:12:27,348 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 00:12:27,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-16 00:12:27,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889456045] [2021-12-16 00:12:27,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 00:12:27,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-16 00:12:27,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 00:12:27,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-16 00:12:27,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-16 00:12:27,386 INFO L87 Difference]: Start difference. First operand has 26 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 19 states have internal predecessors, (28), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 00:12:27,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 00:12:27,405 INFO L93 Difference]: Finished difference Result 49 states and 72 transitions. [2021-12-16 00:12:27,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-16 00:12:27,407 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-12-16 00:12:27,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 00:12:27,413 INFO L225 Difference]: With dead ends: 49 [2021-12-16 00:12:27,413 INFO L226 Difference]: Without dead ends: 22 [2021-12-16 00:12:27,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-16 00:12:27,420 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 00:12:27,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 00:12:27,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-12-16 00:12:27,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-12-16 00:12:27,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-16 00:12:27,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-12-16 00:12:27,453 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 19 [2021-12-16 00:12:27,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 00:12:27,454 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-12-16 00:12:27,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-16 00:12:27,454 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-12-16 00:12:27,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-16 00:12:27,455 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 00:12:27,456 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 00:12:27,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-16 00:12:27,457 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 00:12:27,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 00:12:27,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1409334960, now seen corresponding path program 1 times [2021-12-16 00:12:27,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 00:12:27,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122546113] [2021-12-16 00:12:27,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:27,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 00:12:27,497 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-16 00:12:27,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [527826156] [2021-12-16 00:12:27,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:27,501 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 00:12:27,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 00:12:27,503 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 00:12:27,504 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-16 00:12:27,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 00:12:27,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-16 00:12:27,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 00:12:27,872 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 00:12:27,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 00:12:28,031 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 00:12:28,031 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 00:12:28,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122546113] [2021-12-16 00:12:28,032 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-16 00:12:28,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527826156] [2021-12-16 00:12:28,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527826156] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-16 00:12:28,033 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 00:12:28,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2021-12-16 00:12:28,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434457690] [2021-12-16 00:12:28,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 00:12:28,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 00:12:28,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 00:12:28,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 00:12:28,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-12-16 00:12:28,036 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-16 00:12:30,216 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-16 00:12:30,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 00:12:30,363 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2021-12-16 00:12:30,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-16 00:12:30,364 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2021-12-16 00:12:30,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 00:12:30,365 INFO L225 Difference]: With dead ends: 34 [2021-12-16 00:12:30,365 INFO L226 Difference]: Without dead ends: 31 [2021-12-16 00:12:30,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-12-16 00:12:30,366 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 9 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-12-16 00:12:30,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 90 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-12-16 00:12:30,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-12-16 00:12:30,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-12-16 00:12:30,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 23 states have internal predecessors, (27), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 00:12:30,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-12-16 00:12:30,373 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 20 [2021-12-16 00:12:30,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 00:12:30,374 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-12-16 00:12:30,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-16 00:12:30,375 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-12-16 00:12:30,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-16 00:12:30,376 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 00:12:30,376 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 00:12:30,397 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-16 00:12:30,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 00:12:30,591 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 00:12:30,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 00:12:30,592 INFO L85 PathProgramCache]: Analyzing trace with hash -944023701, now seen corresponding path program 1 times [2021-12-16 00:12:30,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 00:12:30,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748305715] [2021-12-16 00:12:30,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:30,593 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 00:12:30,605 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-16 00:12:30,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [997582025] [2021-12-16 00:12:30,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:30,606 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 00:12:30,607 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 00:12:30,608 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 00:12:30,609 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-16 00:12:30,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 00:12:30,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-16 00:12:30,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 00:12:30,897 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 00:12:30,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 00:12:31,124 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 00:12:31,125 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 00:12:31,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748305715] [2021-12-16 00:12:31,125 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-16 00:12:31,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997582025] [2021-12-16 00:12:31,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997582025] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-16 00:12:31,125 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-16 00:12:31,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2021-12-16 00:12:31,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603467536] [2021-12-16 00:12:31,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 00:12:31,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 00:12:31,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 00:12:31,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 00:12:31,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-12-16 00:12:31,128 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-16 00:12:31,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 00:12:31,161 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2021-12-16 00:12:31,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 00:12:31,162 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2021-12-16 00:12:31,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 00:12:31,164 INFO L225 Difference]: With dead ends: 39 [2021-12-16 00:12:31,164 INFO L226 Difference]: Without dead ends: 37 [2021-12-16 00:12:31,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-12-16 00:12:31,165 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 6 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 00:12:31,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 95 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 11 Unchecked, 0.0s Time] [2021-12-16 00:12:31,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-12-16 00:12:31,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-12-16 00:12:31,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-16 00:12:31,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2021-12-16 00:12:31,171 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 22 [2021-12-16 00:12:31,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 00:12:31,172 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2021-12-16 00:12:31,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-16 00:12:31,172 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2021-12-16 00:12:31,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-16 00:12:31,173 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 00:12:31,174 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 00:12:31,196 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-16 00:12:31,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-16 00:12:31,388 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 00:12:31,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 00:12:31,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1056631181, now seen corresponding path program 1 times [2021-12-16 00:12:31,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 00:12:31,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073761089] [2021-12-16 00:12:31,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:31,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 00:12:31,402 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-16 00:12:31,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [573215525] [2021-12-16 00:12:31,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:31,411 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 00:12:31,412 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 00:12:31,413 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 00:12:31,414 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-16 00:12:31,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 00:12:31,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-16 00:12:31,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 00:12:31,525 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-16 00:12:31,525 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 00:12:31,525 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 00:12:31,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073761089] [2021-12-16 00:12:31,526 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-16 00:12:31,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573215525] [2021-12-16 00:12:31,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573215525] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 00:12:31,526 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 00:12:31,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-16 00:12:31,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428751413] [2021-12-16 00:12:31,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 00:12:31,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-16 00:12:31,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 00:12:31,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-16 00:12:31,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-16 00:12:31,529 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-16 00:12:31,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 00:12:31,544 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2021-12-16 00:12:31,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-16 00:12:31,545 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-12-16 00:12:31,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 00:12:31,546 INFO L225 Difference]: With dead ends: 48 [2021-12-16 00:12:31,546 INFO L226 Difference]: Without dead ends: 30 [2021-12-16 00:12:31,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-16 00:12:31,547 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-16 00:12:31,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 43 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 00:12:31,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-12-16 00:12:31,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-12-16 00:12:31,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 00:12:31,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-12-16 00:12:31,561 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 28 [2021-12-16 00:12:31,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 00:12:31,561 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-12-16 00:12:31,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-16 00:12:31,562 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-12-16 00:12:31,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-16 00:12:31,562 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 00:12:31,562 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 00:12:31,583 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-16 00:12:31,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 00:12:31,775 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 00:12:31,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 00:12:31,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1145312525, now seen corresponding path program 1 times [2021-12-16 00:12:31,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 00:12:31,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304377742] [2021-12-16 00:12:31,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:31,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 00:12:31,786 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-16 00:12:31,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [961544210] [2021-12-16 00:12:31,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:31,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 00:12:31,787 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 00:12:31,788 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 00:12:31,789 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-16 00:12:31,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 00:12:31,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-16 00:12:31,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 00:12:31,924 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 00:12:31,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 00:12:32,056 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 00:12:32,056 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-16 00:12:32,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304377742] [2021-12-16 00:12:32,057 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-16 00:12:32,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961544210] [2021-12-16 00:12:32,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961544210] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 00:12:32,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-16 00:12:32,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-12-16 00:12:32,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679759221] [2021-12-16 00:12:32,058 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-16 00:12:32,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-16 00:12:32,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-16 00:12:32,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-16 00:12:32,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-12-16 00:12:32,059 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-16 00:12:34,131 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-16 00:12:36,248 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-16 00:12:36,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 00:12:36,411 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2021-12-16 00:12:36,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-16 00:12:36,411 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2021-12-16 00:12:36,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 00:12:36,412 INFO L225 Difference]: With dead ends: 36 [2021-12-16 00:12:36,412 INFO L226 Difference]: Without dead ends: 29 [2021-12-16 00:12:36,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-12-16 00:12:36,413 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 16 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-12-16 00:12:36,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 88 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 37 Invalid, 2 Unknown, 0 Unchecked, 4.3s Time] [2021-12-16 00:12:36,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-12-16 00:12:36,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-12-16 00:12:36,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-16 00:12:36,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-12-16 00:12:36,418 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 28 [2021-12-16 00:12:36,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 00:12:36,419 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-12-16 00:12:36,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-16 00:12:36,419 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-12-16 00:12:36,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-16 00:12:36,420 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 00:12:36,420 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 00:12:36,437 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-16 00:12:36,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 00:12:36,625 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-16 00:12:36,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 00:12:36,626 INFO L85 PathProgramCache]: Analyzing trace with hash -444407410, now seen corresponding path program 1 times [2021-12-16 00:12:36,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-16 00:12:36,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063959787] [2021-12-16 00:12:36,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:36,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-16 00:12:36,635 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-16 00:12:36,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [579730014] [2021-12-16 00:12:36,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 00:12:36,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 00:12:36,636 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 00:12:36,637 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 00:12:36,643 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process