./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-fpi/eqn2.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/array-fpi/eqn2.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 1c480970927f1590d7067a3175d5980a643352bf ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis 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/array-fpi/eqn2.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.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 1c480970927f1590d7067a3175d5980a643352bf ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: UNKNOWN --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-25 19:04:53,583 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-25 19:04:53,585 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-25 19:04:53,609 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-25 19:04:53,610 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-25 19:04:53,611 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-25 19:04:53,612 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-25 19:04:53,614 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-25 19:04:53,615 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-25 19:04:53,616 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-25 19:04:53,617 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-25 19:04:53,619 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-25 19:04:53,619 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-25 19:04:53,620 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-25 19:04:53,621 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-25 19:04:53,622 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-25 19:04:53,623 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-25 19:04:53,624 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-25 19:04:53,625 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-25 19:04:53,627 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-25 19:04:53,628 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-25 19:04:53,629 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-25 19:04:53,630 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-25 19:04:53,631 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-25 19:04:53,633 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-25 19:04:53,633 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-25 19:04:53,634 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-25 19:04:53,634 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-25 19:04:53,635 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-25 19:04:53,636 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-25 19:04:53,636 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-25 19:04:53,637 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-25 19:04:53,637 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-25 19:04:53,638 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-25 19:04:53,639 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-25 19:04:53,639 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-25 19:04:53,640 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-25 19:04:53,640 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-25 19:04:53,641 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-25 19:04:53,642 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-25 19:04:53,642 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-25 19:04:53,643 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-25 19:04:53,669 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-25 19:04:53,670 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-25 19:04:53,670 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-25 19:04:53,670 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-25 19:04:53,672 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-25 19:04:53,672 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-25 19:04:53,672 INFO L138 SettingsManager]: * Use SBE=true [2021-08-25 19:04:53,672 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-25 19:04:53,673 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-25 19:04:53,673 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-25 19:04:53,673 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-25 19:04:53,673 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-25 19:04:53,673 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-25 19:04:53,674 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-25 19:04:53,674 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-25 19:04:53,674 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-25 19:04:53,674 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-25 19:04:53,674 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-25 19:04:53,675 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-25 19:04:53,675 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-25 19:04:53,675 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-25 19:04:53,675 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-25 19:04:53,675 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-25 19:04:53,676 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-25 19:04:53,686 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-25 19:04:53,687 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-25 19:04:53,687 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-25 19:04:53,687 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-25 19:04:53,687 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-25 19:04:53,687 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-25 19:04:53,688 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1c480970927f1590d7067a3175d5980a643352bf [2021-08-25 19:04:53,985 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-25 19:04:54,002 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-25 19:04:54,004 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-25 19:04:54,005 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-25 19:04:54,006 INFO L275 PluginConnector]: CDTParser initialized [2021-08-25 19:04:54,007 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/eqn2.c [2021-08-25 19:04:54,077 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de4fbc11a/2965362903a34ea1a607d4ffa7821efb/FLAG324f9d03c [2021-08-25 19:04:54,535 INFO L306 CDTParser]: Found 1 translation units. [2021-08-25 19:04:54,536 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/eqn2.c [2021-08-25 19:04:54,542 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de4fbc11a/2965362903a34ea1a607d4ffa7821efb/FLAG324f9d03c [2021-08-25 19:04:54,560 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de4fbc11a/2965362903a34ea1a607d4ffa7821efb [2021-08-25 19:04:54,565 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-25 19:04:54,567 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-25 19:04:54,569 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-25 19:04:54,570 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-25 19:04:54,572 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-25 19:04:54,573 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,574 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e10be8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54, skipping insertion in model container [2021-08-25 19:04:54,574 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,580 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-25 19:04:54,593 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-25 19:04:54,703 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/array-fpi/eqn2.c[587,600] [2021-08-25 19:04:54,717 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-25 19:04:54,724 INFO L203 MainTranslator]: Completed pre-run [2021-08-25 19:04:54,734 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/array-fpi/eqn2.c[587,600] [2021-08-25 19:04:54,741 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-25 19:04:54,751 INFO L208 MainTranslator]: Completed translation [2021-08-25 19:04:54,752 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54 WrapperNode [2021-08-25 19:04:54,752 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-25 19:04:54,753 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-25 19:04:54,753 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-25 19:04:54,753 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-25 19:04:54,763 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,769 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,814 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-25 19:04:54,815 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-25 19:04:54,815 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-25 19:04:54,815 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-25 19:04:54,822 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,823 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,838 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,839 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,844 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,853 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,859 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,868 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-25 19:04:54,869 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-25 19:04:54,870 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-25 19:04:54,870 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-25 19:04:54,870 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (1/1) ... [2021-08-25 19:04:54,876 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-25 19:04:54,885 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:04:54,894 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) [2021-08-25 19:04:54,896 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 [2021-08-25 19:04:54,929 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-25 19:04:54,929 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-25 19:04:54,931 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-08-25 19:04:54,931 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-08-25 19:04:54,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-25 19:04:54,932 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-25 19:04:54,932 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-08-25 19:04:55,246 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-25 19:04:55,247 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-08-25 19:04:55,248 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.08 07:04:55 BoogieIcfgContainer [2021-08-25 19:04:55,248 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-25 19:04:55,250 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-25 19:04:55,250 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-25 19:04:55,252 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-25 19:04:55,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.08 07:04:54" (1/3) ... [2021-08-25 19:04:55,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29f38152 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.08 07:04:55, skipping insertion in model container [2021-08-25 19:04:55,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:04:54" (2/3) ... [2021-08-25 19:04:55,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29f38152 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.08 07:04:55, skipping insertion in model container [2021-08-25 19:04:55,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.08 07:04:55" (3/3) ... [2021-08-25 19:04:55,254 INFO L111 eAbstractionObserver]: Analyzing ICFG eqn2.c [2021-08-25 19:04:55,258 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-25 19:04:55,258 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-25 19:04:55,292 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-25 19:04:55,297 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 [2021-08-25 19:04:55,297 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-25 19:04:55,314 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:55,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-08-25 19:04:55,318 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:55,318 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:55,319 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:04:55,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:04:55,323 INFO L82 PathProgramCache]: Analyzing trace with hash -1828546148, now seen corresponding path program 1 times [2021-08-25 19:04:55,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:04:55,331 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686877964] [2021-08-25 19:04:55,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:55,332 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:04:55,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:04:55,504 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:04:55,505 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:04:55,506 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686877964] [2021-08-25 19:04:55,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686877964] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-25 19:04:55,507 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:04:55,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-08-25 19:04:55,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337711899] [2021-08-25 19:04:55,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-08-25 19:04:55,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:04:55,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-08-25 19:04:55,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-08-25 19:04:55,543 INFO L87 Difference]: Start difference. First operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:55,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:04:55,555 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2021-08-25 19:04:55,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-08-25 19:04:55,556 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-08-25 19:04:55,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:04:55,562 INFO L225 Difference]: With dead ends: 38 [2021-08-25 19:04:55,562 INFO L226 Difference]: Without dead ends: 17 [2021-08-25 19:04:55,565 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-08-25 19:04:55,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-08-25 19:04:55,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-08-25 19:04:55,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:55,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-08-25 19:04:55,593 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-08-25 19:04:55,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:04:55,594 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-08-25 19:04:55,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:55,594 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-08-25 19:04:55,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-08-25 19:04:55,595 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:55,595 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:55,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-25 19:04:55,596 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:04:55,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:04:55,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1148487778, now seen corresponding path program 1 times [2021-08-25 19:04:55,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:04:55,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373630209] [2021-08-25 19:04:55,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:55,600 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:04:55,616 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:04:55,617 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [769435792] [2021-08-25 19:04:55,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:55,617 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:04:55,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:04:55,620 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) [2021-08-25 19:04:55,620 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-25 19:04:55,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:04:55,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-25 19:04:55,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:04:55,758 INFO L354 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-08-25 19:04:55,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 23 [2021-08-25 19:04:55,876 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:04:55,877 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:04:55,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373630209] [2021-08-25 19:04:55,877 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:04:55,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769435792] [2021-08-25 19:04:55,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769435792] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-25 19:04:55,878 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:04:55,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-25 19:04:55,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720471349] [2021-08-25 19:04:55,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-25 19:04:55,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:04:55,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-25 19:04:55,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-08-25 19:04:55,881 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:55,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:04:55,952 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-08-25 19:04:55,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-25 19:04:55,953 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-08-25 19:04:55,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:04:55,954 INFO L225 Difference]: With dead ends: 34 [2021-08-25 19:04:55,954 INFO L226 Difference]: Without dead ends: 32 [2021-08-25 19:04:55,955 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 27.0ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-08-25 19:04:55,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-08-25 19:04:55,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 23. [2021-08-25 19:04:55,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:55,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-08-25 19:04:55,959 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 12 [2021-08-25 19:04:55,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:04:55,960 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-08-25 19:04:55,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:55,960 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-08-25 19:04:55,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-08-25 19:04:55,961 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:55,961 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:55,983 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-25 19:04:56,169 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 [2021-08-25 19:04:56,169 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:04:56,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:04:56,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1755224028, now seen corresponding path program 1 times [2021-08-25 19:04:56,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:04:56,170 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260230129] [2021-08-25 19:04:56,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:56,171 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:04:56,190 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:04:56,191 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1194659201] [2021-08-25 19:04:56,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:56,191 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:04:56,192 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:04:56,193 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) [2021-08-25 19:04:56,195 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-25 19:04:56,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:04:56,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2021-08-25 19:04:56,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:04:56,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:04:56,331 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:04:56,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260230129] [2021-08-25 19:04:56,332 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:04:56,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194659201] [2021-08-25 19:04:56,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1194659201] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-25 19:04:56,332 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:04:56,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-25 19:04:56,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603703085] [2021-08-25 19:04:56,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-25 19:04:56,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:04:56,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-25 19:04:56,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-08-25 19:04:56,334 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:56,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:04:56,396 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2021-08-25 19:04:56,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-25 19:04:56,397 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-08-25 19:04:56,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:04:56,398 INFO L225 Difference]: With dead ends: 49 [2021-08-25 19:04:56,398 INFO L226 Difference]: Without dead ends: 40 [2021-08-25 19:04:56,398 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.8ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-08-25 19:04:56,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-08-25 19:04:56,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 23. [2021-08-25 19:04:56,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:56,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-08-25 19:04:56,402 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 14 [2021-08-25 19:04:56,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:04:56,403 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-08-25 19:04:56,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:56,403 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-08-25 19:04:56,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-08-25 19:04:56,404 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:56,404 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:56,429 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-25 19:04:56,619 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 [2021-08-25 19:04:56,619 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:04:56,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:04:56,620 INFO L82 PathProgramCache]: Analyzing trace with hash -1842440164, now seen corresponding path program 1 times [2021-08-25 19:04:56,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:04:56,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236839308] [2021-08-25 19:04:56,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:56,621 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:04:56,648 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:04:56,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1360698069] [2021-08-25 19:04:56,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:56,649 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:04:56,649 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:04:56,650 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) [2021-08-25 19:04:56,652 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-25 19:04:56,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:04:56,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2021-08-25 19:04:56,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:04:56,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:04:56,785 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:04:56,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236839308] [2021-08-25 19:04:56,785 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:04:56,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360698069] [2021-08-25 19:04:56,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360698069] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-25 19:04:56,786 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-25 19:04:56,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-08-25 19:04:56,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498923861] [2021-08-25 19:04:56,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-25 19:04:56,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:04:56,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-25 19:04:56,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-08-25 19:04:56,787 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:56,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:04:56,880 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2021-08-25 19:04:56,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-25 19:04:56,880 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-08-25 19:04:56,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:04:56,881 INFO L225 Difference]: With dead ends: 44 [2021-08-25 19:04:56,881 INFO L226 Difference]: Without dead ends: 37 [2021-08-25 19:04:56,881 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.7ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-08-25 19:04:56,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-08-25 19:04:56,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 24. [2021-08-25 19:04:56,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:56,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-08-25 19:04:56,885 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 14 [2021-08-25 19:04:56,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:04:56,885 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-08-25 19:04:56,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:56,885 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-08-25 19:04:56,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-25 19:04:56,886 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:56,886 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:56,912 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-25 19:04:57,097 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 [2021-08-25 19:04:57,097 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:04:57,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:04:57,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1667884396, now seen corresponding path program 1 times [2021-08-25 19:04:57,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:04:57,098 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853517980] [2021-08-25 19:04:57,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:57,098 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:04:57,113 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:04:57,124 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [21205603] [2021-08-25 19:04:57,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:57,125 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:04:57,125 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:04:57,132 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) [2021-08-25 19:04:57,140 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-25 19:04:57,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:04:57,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 5 conjunts are in the unsatisfiable core [2021-08-25 19:04:57,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:04:57,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:04:57,327 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:04:57,327 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853517980] [2021-08-25 19:04:57,327 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:04:57,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21205603] [2021-08-25 19:04:57,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21205603] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-25 19:04:57,328 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:04:57,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-08-25 19:04:57,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511741503] [2021-08-25 19:04:57,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-25 19:04:57,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:04:57,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-25 19:04:57,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-08-25 19:04:57,330 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:57,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:04:57,422 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-08-25 19:04:57,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-25 19:04:57,423 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-08-25 19:04:57,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:04:57,423 INFO L225 Difference]: With dead ends: 41 [2021-08-25 19:04:57,423 INFO L226 Difference]: Without dead ends: 27 [2021-08-25 19:04:57,424 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 57.0ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-08-25 19:04:57,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-25 19:04:57,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 19. [2021-08-25 19:04:57,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:57,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-08-25 19:04:57,426 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 16 [2021-08-25 19:04:57,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:04:57,427 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-08-25 19:04:57,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:57,427 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-08-25 19:04:57,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-25 19:04:57,427 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:57,427 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:57,474 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-08-25 19:04:57,641 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 [2021-08-25 19:04:57,642 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:04:57,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:04:57,642 INFO L82 PathProgramCache]: Analyzing trace with hash 586911962, now seen corresponding path program 1 times [2021-08-25 19:04:57,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:04:57,642 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174755481] [2021-08-25 19:04:57,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:57,643 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:04:57,661 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:04:57,661 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1315655298] [2021-08-25 19:04:57,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:57,662 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:04:57,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:04:57,663 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) [2021-08-25 19:04:57,669 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-25 19:04:57,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:04:57,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 16 conjunts are in the unsatisfiable core [2021-08-25 19:04:57,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:04:57,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-08-25 19:04:57,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-08-25 19:04:57,906 INFO L354 Elim1Store]: treesize reduction 23, result has 23.3 percent of original size [2021-08-25 19:04:57,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 32 [2021-08-25 19:04:58,069 INFO L354 Elim1Store]: treesize reduction 124, result has 16.2 percent of original size [2021-08-25 19:04:58,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 48 [2021-08-25 19:04:58,335 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:04:58,336 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:04:58,336 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174755481] [2021-08-25 19:04:58,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:04:58,336 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315655298] [2021-08-25 19:04:58,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315655298] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-25 19:04:58,337 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-25 19:04:58,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-08-25 19:04:58,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831537215] [2021-08-25 19:04:58,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-25 19:04:58,338 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:04:58,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-25 19:04:58,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-08-25 19:04:58,339 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:58,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:04:58,653 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2021-08-25 19:04:58,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-25 19:04:58,657 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-08-25 19:04:58,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:04:58,658 INFO L225 Difference]: With dead ends: 43 [2021-08-25 19:04:58,658 INFO L226 Difference]: Without dead ends: 41 [2021-08-25 19:04:58,658 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 217.4ms TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-08-25 19:04:58,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-08-25 19:04:58,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 32. [2021-08-25 19:04:58,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 31 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:58,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-08-25 19:04:58,663 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 16 [2021-08-25 19:04:58,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:04:58,663 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-08-25 19:04:58,663 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:58,663 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-08-25 19:04:58,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-08-25 19:04:58,664 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:58,664 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:58,688 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-25 19:04:58,874 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 [2021-08-25 19:04:58,875 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:04:58,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:04:58,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1267903976, now seen corresponding path program 2 times [2021-08-25 19:04:58,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:04:58,876 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084667140] [2021-08-25 19:04:58,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:58,876 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:04:58,908 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:04:58,909 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1575776500] [2021-08-25 19:04:58,909 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-25 19:04:58,909 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:04:58,909 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:04:58,912 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) [2021-08-25 19:04:58,914 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-25 19:04:59,029 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-25 19:04:59,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-25 19:04:59,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-25 19:04:59,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:04:59,131 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:04:59,132 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:04:59,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084667140] [2021-08-25 19:04:59,132 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:04:59,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575776500] [2021-08-25 19:04:59,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1575776500] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-25 19:04:59,132 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-25 19:04:59,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-08-25 19:04:59,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878308457] [2021-08-25 19:04:59,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-25 19:04:59,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:04:59,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-25 19:04:59,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-08-25 19:04:59,134 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:59,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:04:59,259 INFO L93 Difference]: Finished difference Result 65 states and 71 transitions. [2021-08-25 19:04:59,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-25 19:04:59,262 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-08-25 19:04:59,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:04:59,263 INFO L225 Difference]: With dead ends: 65 [2021-08-25 19:04:59,263 INFO L226 Difference]: Without dead ends: 56 [2021-08-25 19:04:59,264 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 60.2ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-08-25 19:04:59,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-08-25 19:04:59,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 32. [2021-08-25 19:04:59,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:59,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-08-25 19:04:59,274 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-08-25 19:04:59,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:04:59,274 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-08-25 19:04:59,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:59,274 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-08-25 19:04:59,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-08-25 19:04:59,275 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:59,275 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:59,302 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-25 19:04:59,499 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 [2021-08-25 19:04:59,499 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:04:59,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:04:59,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1174519208, now seen corresponding path program 3 times [2021-08-25 19:04:59,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:04:59,500 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559226139] [2021-08-25 19:04:59,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:04:59,500 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:04:59,514 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:04:59,514 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1707718502] [2021-08-25 19:04:59,514 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-25 19:04:59,515 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:04:59,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:04:59,523 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) [2021-08-25 19:04:59,524 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-25 19:04:59,648 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-08-25 19:04:59,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-25 19:04:59,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-25 19:04:59,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:04:59,749 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:04:59,750 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:04:59,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559226139] [2021-08-25 19:04:59,750 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:04:59,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707718502] [2021-08-25 19:04:59,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707718502] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-25 19:04:59,751 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-25 19:04:59,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-08-25 19:04:59,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396038499] [2021-08-25 19:04:59,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-25 19:04:59,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:04:59,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-25 19:04:59,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-08-25 19:04:59,753 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:59,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:04:59,862 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2021-08-25 19:04:59,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-25 19:04:59,863 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-08-25 19:04:59,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:04:59,864 INFO L225 Difference]: With dead ends: 60 [2021-08-25 19:04:59,864 INFO L226 Difference]: Without dead ends: 53 [2021-08-25 19:04:59,864 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 44.6ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-08-25 19:04:59,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-08-25 19:04:59,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 34. [2021-08-25 19:04:59,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.121212121212121) internal successors, (37), 33 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:59,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-08-25 19:04:59,869 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 18 [2021-08-25 19:04:59,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:04:59,869 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-08-25 19:04:59,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:04:59,869 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-08-25 19:04:59,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-25 19:04:59,870 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:04:59,870 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:04:59,897 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:00,095 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 [2021-08-25 19:05:00,095 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:00,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:00,096 INFO L82 PathProgramCache]: Analyzing trace with hash -1786143722, now seen corresponding path program 4 times [2021-08-25 19:05:00,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:05:00,096 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560311148] [2021-08-25 19:05:00,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:00,096 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:05:00,118 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:05:00,124 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1927114520] [2021-08-25 19:05:00,125 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-25 19:05:00,125 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:05:00,126 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:05:00,127 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) [2021-08-25 19:05:00,149 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-08-25 19:05:00,435 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-25 19:05:00,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-25 19:05:00,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 26 conjunts are in the unsatisfiable core [2021-08-25 19:05:00,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:00,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-08-25 19:05:00,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-08-25 19:05:00,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,559 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:00,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,566 INFO L354 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2021-08-25 19:05:00,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 4 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 8 new quantified variables, introduced 6 case distinctions, treesize of input 186 treesize of output 304 [2021-08-25 19:05:00,631 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-08-25 19:05:00,705 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-08-25 19:05:00,751 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:00,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,762 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-25 19:05:00,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 121 treesize of output 70 [2021-08-25 19:05:00,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,783 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:00,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,788 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-25 19:05:00,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 157 treesize of output 77 [2021-08-25 19:05:00,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,809 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:00,813 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-25 19:05:00,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 104 treesize of output 49 [2021-08-25 19:05:00,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:00,920 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-25 19:05:00,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 46 [2021-08-25 19:05:01,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,139 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,151 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,155 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,192 INFO L354 Elim1Store]: treesize reduction 86, result has 18.1 percent of original size [2021-08-25 19:05:01,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 4 stores, 8 select indices, 8 select index equivalence classes, 10 disjoint index pairs (out of 28 index pairs), introduced 12 new quantified variables, introduced 30 case distinctions, treesize of input 270 treesize of output 510 [2021-08-25 19:05:01,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,273 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,288 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 10 disjoint index pairs (out of 36 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 198 treesize of output 118 [2021-08-25 19:05:01,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,416 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 10 disjoint index pairs (out of 28 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 338 treesize of output 201 [2021-08-25 19:05:01,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 10 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 232 treesize of output 130 [2021-08-25 19:05:01,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,637 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,637 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:01,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:01,649 INFO L354 Elim1Store]: treesize reduction 35, result has 16.7 percent of original size [2021-08-25 19:05:01,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 11 case distinctions, treesize of input 69 treesize of output 66 [2021-08-25 19:05:01,870 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:01,871 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:05:01,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560311148] [2021-08-25 19:05:01,871 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:05:01,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927114520] [2021-08-25 19:05:01,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927114520] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-25 19:05:01,871 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-25 19:05:01,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-08-25 19:05:01,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771270734] [2021-08-25 19:05:01,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-25 19:05:01,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:05:01,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-25 19:05:01,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-08-25 19:05:01,873 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:02,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:02,475 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2021-08-25 19:05:02,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-25 19:05:02,475 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-08-25 19:05:02,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:02,476 INFO L225 Difference]: With dead ends: 64 [2021-08-25 19:05:02,476 INFO L226 Difference]: Without dead ends: 62 [2021-08-25 19:05:02,477 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 514.8ms TimeCoverageRelationStatistics Valid=92, Invalid=288, Unknown=0, NotChecked=0, Total=380 [2021-08-25 19:05:02,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-08-25 19:05:02,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 47. [2021-08-25 19:05:02,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 46 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:02,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2021-08-25 19:05:02,482 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 20 [2021-08-25 19:05:02,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:02,482 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2021-08-25 19:05:02,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:02,482 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2021-08-25 19:05:02,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-25 19:05:02,483 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:02,483 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:02,511 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:02,704 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 [2021-08-25 19:05:02,705 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:02,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:02,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1146782124, now seen corresponding path program 5 times [2021-08-25 19:05:02,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:05:02,705 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799803509] [2021-08-25 19:05:02,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:02,706 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:05:02,731 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:05:02,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1560374727] [2021-08-25 19:05:02,732 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-25 19:05:02,732 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:05:02,732 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:05:02,749 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) [2021-08-25 19:05:02,750 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-08-25 19:05:06,024 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-08-25 19:05:06,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-25 19:05:06,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-25 19:05:06,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:06,169 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:06,170 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:05:06,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799803509] [2021-08-25 19:05:06,170 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:05:06,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560374727] [2021-08-25 19:05:06,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560374727] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-25 19:05:06,170 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-25 19:05:06,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-08-25 19:05:06,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754358121] [2021-08-25 19:05:06,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-25 19:05:06,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:05:06,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-25 19:05:06,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-08-25 19:05:06,172 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:06,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:06,334 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2021-08-25 19:05:06,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-25 19:05:06,335 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-08-25 19:05:06,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:06,336 INFO L225 Difference]: With dead ends: 97 [2021-08-25 19:05:06,336 INFO L226 Difference]: Without dead ends: 88 [2021-08-25 19:05:06,336 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 75.3ms TimeCoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2021-08-25 19:05:06,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-08-25 19:05:06,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 47. [2021-08-25 19:05:06,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:06,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2021-08-25 19:05:06,342 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 22 [2021-08-25 19:05:06,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:06,342 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2021-08-25 19:05:06,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:06,342 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2021-08-25 19:05:06,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-25 19:05:06,343 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:06,343 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:06,353 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:06,543 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 [2021-08-25 19:05:06,544 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:06,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:06,544 INFO L82 PathProgramCache]: Analyzing trace with hash -1598333292, now seen corresponding path program 6 times [2021-08-25 19:05:06,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:05:06,544 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185805826] [2021-08-25 19:05:06,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:06,545 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:05:06,582 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:05:06,583 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [588613298] [2021-08-25 19:05:06,583 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-25 19:05:06,583 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:05:06,583 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:05:06,589 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) [2021-08-25 19:05:06,590 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-08-25 19:05:06,793 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-08-25 19:05:06,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-25 19:05:06,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-25 19:05:06,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:06,925 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:06,926 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:05:06,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185805826] [2021-08-25 19:05:06,926 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:05:06,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588613298] [2021-08-25 19:05:06,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588613298] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-25 19:05:06,926 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-25 19:05:06,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-08-25 19:05:06,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310727513] [2021-08-25 19:05:06,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-25 19:05:06,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:05:06,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-25 19:05:06,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-08-25 19:05:06,927 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:07,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:07,127 INFO L93 Difference]: Finished difference Result 81 states and 86 transitions. [2021-08-25 19:05:07,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-25 19:05:07,128 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-08-25 19:05:07,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:07,129 INFO L225 Difference]: With dead ends: 81 [2021-08-25 19:05:07,129 INFO L226 Difference]: Without dead ends: 74 [2021-08-25 19:05:07,129 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 65.7ms TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2021-08-25 19:05:07,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-08-25 19:05:07,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 49. [2021-08-25 19:05:07,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 48 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:07,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-08-25 19:05:07,134 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 22 [2021-08-25 19:05:07,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:07,135 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-08-25 19:05:07,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:07,135 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-08-25 19:05:07,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-25 19:05:07,135 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:07,136 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:07,161 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:07,348 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 [2021-08-25 19:05:07,349 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:07,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:07,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1197174726, now seen corresponding path program 1 times [2021-08-25 19:05:07,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:05:07,349 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871179044] [2021-08-25 19:05:07,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:07,350 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:05:07,360 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:05:07,360 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [397515751] [2021-08-25 19:05:07,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:07,360 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:05:07,360 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:05:07,361 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) [2021-08-25 19:05:07,365 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-08-25 19:05:07,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:05:07,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 7 conjunts are in the unsatisfiable core [2021-08-25 19:05:07,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:07,714 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-25 19:05:07,715 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:05:07,715 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871179044] [2021-08-25 19:05:07,715 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:05:07,715 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397515751] [2021-08-25 19:05:07,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397515751] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-25 19:05:07,715 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-08-25 19:05:07,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-08-25 19:05:07,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076213392] [2021-08-25 19:05:07,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-25 19:05:07,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-25 19:05:07,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-25 19:05:07,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-08-25 19:05:07,717 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:07,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:07,817 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2021-08-25 19:05:07,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-25 19:05:07,817 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-08-25 19:05:07,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:07,818 INFO L225 Difference]: With dead ends: 76 [2021-08-25 19:05:07,818 INFO L226 Difference]: Without dead ends: 56 [2021-08-25 19:05:07,818 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 58.3ms TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-08-25 19:05:07,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-08-25 19:05:07,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 44. [2021-08-25 19:05:07,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 43 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:07,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-08-25 19:05:07,822 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 24 [2021-08-25 19:05:07,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:07,822 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-08-25 19:05:07,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:07,823 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-08-25 19:05:07,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-08-25 19:05:07,823 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:07,823 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:07,848 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-08-25 19:05:08,047 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 [2021-08-25 19:05:08,048 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:08,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:08,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1049585326, now seen corresponding path program 7 times [2021-08-25 19:05:08,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-25 19:05:08,048 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182069115] [2021-08-25 19:05:08,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:08,049 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-25 19:05:08,063 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-08-25 19:05:08,063 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [174044621] [2021-08-25 19:05:08,064 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-25 19:05:08,064 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:05:08,064 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:05:08,065 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) [2021-08-25 19:05:08,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-08-25 19:05:08,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:05:08,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 30 conjunts are in the unsatisfiable core [2021-08-25 19:05:08,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:08,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-08-25 19:05:08,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-08-25 19:05:08,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,649 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:08,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,656 INFO L354 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2021-08-25 19:05:08,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 4 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 8 new quantified variables, introduced 6 case distinctions, treesize of input 186 treesize of output 304 [2021-08-25 19:05:08,693 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-08-25 19:05:08,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,731 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:08,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 103 treesize of output 59 [2021-08-25 19:05:08,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,782 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:08,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 165 treesize of output 82 [2021-08-25 19:05:08,794 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:08,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,800 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-25 19:05:08,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 114 treesize of output 54 [2021-08-25 19:05:08,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:08,909 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-08-25 19:05:08,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 46 [2021-08-25 19:05:09,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,422 INFO L354 Elim1Store]: treesize reduction 1177, result has 19.5 percent of original size [2021-08-25 19:05:09,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 4 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 10 new quantified variables, introduced 39 case distinctions, treesize of input 218 treesize of output 418 [2021-08-25 19:05:09,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,573 INFO L354 Elim1Store]: treesize reduction 52, result has 1.9 percent of original size [2021-08-25 19:05:09,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 13 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 3 case distinctions, treesize of input 127 treesize of output 71 [2021-08-25 19:05:09,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 127 treesize of output 71 [2021-08-25 19:05:09,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:09,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 127 treesize of output 72 [2021-08-25 19:05:10,124 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-08-25 19:05:10,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:10,342 INFO L354 Elim1Store]: treesize reduction 60, result has 29.4 percent of original size [2021-08-25 19:05:10,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 11 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 5 case distinctions, treesize of input 151 treesize of output 120 [2021-08-25 19:05:11,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-25 19:05:11,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182069115] [2021-08-25 19:05:11,821 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:05:11,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174044621] [2021-08-25 19:05:11,821 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Alternating quantifiers not yet supported [2021-08-25 19:05:11,821 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:05:11,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-08-25 19:05:11,822 ERROR L172 FreeRefinementEngine]: Strategy CAMEL failed to provide any proof altough trace is infeasible [2021-08-25 19:05:11,822 INFO L626 BasicCegarLoop]: Counterexample might be feasible [2021-08-25 19:05:11,826 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-25 19:05:11,853 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:12,040 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 [2021-08-25 19:05:12,045 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-25 19:05:12,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.08 07:05:12 BoogieIcfgContainer [2021-08-25 19:05:12,060 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-25 19:05:12,060 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-25 19:05:12,060 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-25 19:05:12,061 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-25 19:05:12,061 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.08 07:04:55" (3/4) ... [2021-08-25 19:05:12,078 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-08-25 19:05:12,078 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-25 19:05:12,079 INFO L168 Benchmark]: Toolchain (without parser) took 17512.06 ms. Allocated memory was 54.5 MB in the beginning and 144.7 MB in the end (delta: 90.2 MB). Free memory was 32.0 MB in the beginning and 91.5 MB in the end (delta: -59.5 MB). Peak memory consumption was 31.7 MB. Max. memory is 16.1 GB. [2021-08-25 19:05:12,079 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 54.5 MB. Free memory was 37.1 MB in the beginning and 37.0 MB in the end (delta: 71.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-25 19:05:12,080 INFO L168 Benchmark]: CACSL2BoogieTranslator took 182.76 ms. Allocated memory is still 54.5 MB. Free memory was 31.7 MB in the beginning and 35.5 MB in the end (delta: -3.7 MB). Peak memory consumption was 7.2 MB. Max. memory is 16.1 GB. [2021-08-25 19:05:12,080 INFO L168 Benchmark]: Boogie Procedure Inliner took 61.10 ms. Allocated memory was 54.5 MB in the beginning and 67.1 MB in the end (delta: 12.6 MB). Free memory was 35.3 MB in the beginning and 50.0 MB in the end (delta: -14.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-08-25 19:05:12,080 INFO L168 Benchmark]: Boogie Preprocessor took 53.77 ms. Allocated memory is still 67.1 MB. Free memory was 50.0 MB in the beginning and 48.9 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-25 19:05:12,080 INFO L168 Benchmark]: RCFGBuilder took 379.12 ms. Allocated memory is still 67.1 MB. Free memory was 48.7 MB in the beginning and 33.1 MB in the end (delta: 15.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-08-25 19:05:12,081 INFO L168 Benchmark]: TraceAbstraction took 16810.22 ms. Allocated memory was 67.1 MB in the beginning and 144.7 MB in the end (delta: 77.6 MB). Free memory was 32.7 MB in the beginning and 92.6 MB in the end (delta: -59.9 MB). Peak memory consumption was 70.9 MB. Max. memory is 16.1 GB. [2021-08-25 19:05:12,081 INFO L168 Benchmark]: Witness Printer took 17.98 ms. Allocated memory is still 144.7 MB. Free memory was 92.6 MB in the beginning and 91.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-25 19:05:12,082 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 54.5 MB. Free memory was 37.1 MB in the beginning and 37.0 MB in the end (delta: 71.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 182.76 ms. Allocated memory is still 54.5 MB. Free memory was 31.7 MB in the beginning and 35.5 MB in the end (delta: -3.7 MB). Peak memory consumption was 7.2 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 61.10 ms. Allocated memory was 54.5 MB in the beginning and 67.1 MB in the end (delta: 12.6 MB). Free memory was 35.3 MB in the beginning and 50.0 MB in the end (delta: -14.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 53.77 ms. Allocated memory is still 67.1 MB. Free memory was 50.0 MB in the beginning and 48.9 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 379.12 ms. Allocated memory is still 67.1 MB. Free memory was 48.7 MB in the beginning and 33.1 MB in the end (delta: 15.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 16810.22 ms. Allocated memory was 67.1 MB in the beginning and 144.7 MB in the end (delta: 77.6 MB). Free memory was 32.7 MB in the beginning and 92.6 MB in the end (delta: -59.9 MB). Peak memory consumption was 70.9 MB. Max. memory is 16.1 GB. * Witness Printer took 17.98 ms. Allocated memory is still 144.7 MB. Free memory was 92.6 MB in the beginning and 91.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 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 - UnprovableResult [Line: 15]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L19] int N; [L23] N = __VERIFIER_nondet_int() [L24] COND FALSE !(N <= 0) [L13] COND FALSE !(!cond) [L27] long long i; [L28] long long *a = malloc(sizeof(long long)*N); [L29] long long *b = malloc(sizeof(long long)*N); [L31] a[0] = 4 [L32] b[0] = 1 [L34] i=1 [L34] COND TRUE i 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 -> 1c480970927f1590d7067a3175d5980a643352bf [2021-08-25 19:05:14,381 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-25 19:05:14,399 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-25 19:05:14,402 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-25 19:05:14,403 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-25 19:05:14,403 INFO L275 PluginConnector]: CDTParser initialized [2021-08-25 19:05:14,406 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/eqn2.c [2021-08-25 19:05:14,469 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0dccedeae/32b7de0df37d4f2fbc927ddcbdc151e3/FLAG7577044d8 [2021-08-25 19:05:14,932 INFO L306 CDTParser]: Found 1 translation units. [2021-08-25 19:05:14,933 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/eqn2.c [2021-08-25 19:05:14,939 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0dccedeae/32b7de0df37d4f2fbc927ddcbdc151e3/FLAG7577044d8 [2021-08-25 19:05:15,335 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0dccedeae/32b7de0df37d4f2fbc927ddcbdc151e3 [2021-08-25 19:05:15,338 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-25 19:05:15,340 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-25 19:05:15,343 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-25 19:05:15,343 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-25 19:05:15,346 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-25 19:05:15,347 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,348 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58913cc8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15, skipping insertion in model container [2021-08-25 19:05:15,348 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,354 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-25 19:05:15,368 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-25 19:05:15,489 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/array-fpi/eqn2.c[587,600] [2021-08-25 19:05:15,505 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-25 19:05:15,515 INFO L203 MainTranslator]: Completed pre-run [2021-08-25 19:05:15,527 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/array-fpi/eqn2.c[587,600] [2021-08-25 19:05:15,535 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-25 19:05:15,582 INFO L208 MainTranslator]: Completed translation [2021-08-25 19:05:15,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15 WrapperNode [2021-08-25 19:05:15,584 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-25 19:05:15,585 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-25 19:05:15,585 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-25 19:05:15,585 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-25 19:05:15,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,597 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,622 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-25 19:05:15,623 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-25 19:05:15,623 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-25 19:05:15,623 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-25 19:05:15,629 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,629 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,631 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,631 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,637 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,641 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,642 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,644 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-25 19:05:15,649 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-25 19:05:15,649 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-25 19:05:15,652 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-25 19:05:15,653 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (1/1) ... [2021-08-25 19:05:15,659 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-25 19:05:15,667 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:05:15,686 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) [2021-08-25 19:05:15,696 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 [2021-08-25 19:05:15,730 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-08-25 19:05:15,730 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-25 19:05:15,730 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-08-25 19:05:15,730 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-08-25 19:05:15,731 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-25 19:05:15,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-25 19:05:15,731 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE8 [2021-08-25 19:05:16,074 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-25 19:05:16,075 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-08-25 19:05:16,076 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.08 07:05:16 BoogieIcfgContainer [2021-08-25 19:05:16,076 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-25 19:05:16,078 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-25 19:05:16,078 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-25 19:05:16,080 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-25 19:05:16,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.08 07:05:15" (1/3) ... [2021-08-25 19:05:16,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a075e78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.08 07:05:16, skipping insertion in model container [2021-08-25 19:05:16,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.08 07:05:15" (2/3) ... [2021-08-25 19:05:16,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a075e78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.08 07:05:16, skipping insertion in model container [2021-08-25 19:05:16,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.08 07:05:16" (3/3) ... [2021-08-25 19:05:16,082 INFO L111 eAbstractionObserver]: Analyzing ICFG eqn2.c [2021-08-25 19:05:16,086 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-25 19:05:16,086 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-25 19:05:16,117 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-25 19:05:16,122 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 [2021-08-25 19:05:16,122 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-25 19:05:16,145 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:16,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-08-25 19:05:16,149 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:16,150 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:16,150 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:16,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:16,154 INFO L82 PathProgramCache]: Analyzing trace with hash -1828546148, now seen corresponding path program 1 times [2021-08-25 19:05:16,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-08-25 19:05:16,164 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1377330741] [2021-08-25 19:05:16,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:16,165 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-08-25 19:05:16,165 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-08-25 19:05:16,167 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-08-25 19:05:16,168 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-08-25 19:05:16,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:05:16,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 1 conjunts are in the unsatisfiable core [2021-08-25 19:05:16,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:16,382 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:16,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-25 19:05:16,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:16,442 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-08-25 19:05:16,443 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1377330741] [2021-08-25 19:05:16,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1377330741] provided 2 perfect and 0 imperfect interpolant sequences [2021-08-25 19:05:16,443 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:05:16,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-08-25 19:05:16,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289333895] [2021-08-25 19:05:16,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-08-25 19:05:16,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-08-25 19:05:16,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-08-25 19:05:16,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-08-25 19:05:16,464 INFO L87 Difference]: Start difference. First operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:16,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:16,477 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2021-08-25 19:05:16,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-08-25 19:05:16,478 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-08-25 19:05:16,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:16,484 INFO L225 Difference]: With dead ends: 38 [2021-08-25 19:05:16,484 INFO L226 Difference]: Without dead ends: 17 [2021-08-25 19:05:16,487 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-08-25 19:05:16,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-08-25 19:05:16,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-08-25 19:05:16,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:16,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-08-25 19:05:16,510 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-08-25 19:05:16,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:16,511 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-08-25 19:05:16,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:16,512 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-08-25 19:05:16,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-08-25 19:05:16,512 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:16,512 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:16,528 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:16,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-08-25 19:05:16,724 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:16,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:16,724 INFO L82 PathProgramCache]: Analyzing trace with hash -1148487778, now seen corresponding path program 1 times [2021-08-25 19:05:16,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-08-25 19:05:16,725 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1718588651] [2021-08-25 19:05:16,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:16,726 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-08-25 19:05:16,726 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-08-25 19:05:16,727 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-08-25 19:05:16,729 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-08-25 19:05:16,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:05:16,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-25 19:05:16,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:16,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:16,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:16,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:16,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:16,937 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:16,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:17,030 INFO L354 Elim1Store]: treesize reduction 152, result has 24.0 percent of original size [2021-08-25 19:05:17,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 54 treesize of output 68 [2021-08-25 19:05:17,221 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:17,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:17,223 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:17,233 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-08-25 19:05:17,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 103 treesize of output 65 [2021-08-25 19:05:17,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:17,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-25 19:05:18,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:18,049 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-08-25 19:05:18,049 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1718588651] [2021-08-25 19:05:18,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1718588651] provided 2 perfect and 0 imperfect interpolant sequences [2021-08-25 19:05:18,050 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:05:18,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-08-25 19:05:18,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713379720] [2021-08-25 19:05:18,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-25 19:05:18,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-08-25 19:05:18,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-25 19:05:18,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-08-25 19:05:18,053 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:19,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:19,047 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-08-25 19:05:19,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-25 19:05:19,057 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-08-25 19:05:19,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:19,058 INFO L225 Difference]: With dead ends: 35 [2021-08-25 19:05:19,058 INFO L226 Difference]: Without dead ends: 33 [2021-08-25 19:05:19,059 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 887.2ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-08-25 19:05:19,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-08-25 19:05:19,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 23. [2021-08-25 19:05:19,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:19,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-08-25 19:05:19,063 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 12 [2021-08-25 19:05:19,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:19,064 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-08-25 19:05:19,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:19,064 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-08-25 19:05:19,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-08-25 19:05:19,065 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:19,065 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:19,075 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:19,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-08-25 19:05:19,266 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:19,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:19,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1755224028, now seen corresponding path program 1 times [2021-08-25 19:05:19,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-08-25 19:05:19,267 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [770748839] [2021-08-25 19:05:19,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:19,267 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-08-25 19:05:19,268 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-08-25 19:05:19,269 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-08-25 19:05:19,296 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-08-25 19:05:19,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:05:19,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-25 19:05:19,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:19,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:19,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-25 19:05:19,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:19,739 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-08-25 19:05:19,740 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [770748839] [2021-08-25 19:05:19,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [770748839] provided 2 perfect and 0 imperfect interpolant sequences [2021-08-25 19:05:19,740 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:05:19,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 5] imperfect sequences [] total 10 [2021-08-25 19:05:19,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012676791] [2021-08-25 19:05:19,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-25 19:05:19,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-08-25 19:05:19,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-25 19:05:19,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-08-25 19:05:19,745 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:20,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:20,295 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-08-25 19:05:20,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-25 19:05:20,302 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-08-25 19:05:20,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:20,302 INFO L225 Difference]: With dead ends: 43 [2021-08-25 19:05:20,303 INFO L226 Difference]: Without dead ends: 34 [2021-08-25 19:05:20,303 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 366.2ms TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2021-08-25 19:05:20,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-08-25 19:05:20,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 23. [2021-08-25 19:05:20,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:20,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-08-25 19:05:20,307 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 14 [2021-08-25 19:05:20,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:20,307 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-08-25 19:05:20,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:20,308 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-08-25 19:05:20,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-08-25 19:05:20,308 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:20,308 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:20,317 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:20,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-08-25 19:05:20,513 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:20,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:20,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1842440164, now seen corresponding path program 1 times [2021-08-25 19:05:20,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-08-25 19:05:20,514 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1978245045] [2021-08-25 19:05:20,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:20,514 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-08-25 19:05:20,514 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-08-25 19:05:20,515 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-08-25 19:05:20,516 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-08-25 19:05:20,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:05:20,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2021-08-25 19:05:20,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:20,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:20,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-25 19:05:21,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:21,156 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-08-25 19:05:21,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1978245045] [2021-08-25 19:05:21,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1978245045] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-25 19:05:21,156 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-25 19:05:21,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2021-08-25 19:05:21,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174993623] [2021-08-25 19:05:21,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-25 19:05:21,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-08-25 19:05:21,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-25 19:05:21,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-08-25 19:05:21,157 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:21,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:21,992 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2021-08-25 19:05:21,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-08-25 19:05:21,996 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-08-25 19:05:21,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:21,996 INFO L225 Difference]: With dead ends: 58 [2021-08-25 19:05:21,996 INFO L226 Difference]: Without dead ends: 49 [2021-08-25 19:05:21,997 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 680.7ms TimeCoverageRelationStatistics Valid=200, Invalid=450, Unknown=0, NotChecked=0, Total=650 [2021-08-25 19:05:21,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-08-25 19:05:22,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 30. [2021-08-25 19:05:22,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:22,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-08-25 19:05:22,002 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 14 [2021-08-25 19:05:22,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:22,002 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-08-25 19:05:22,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:22,003 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-08-25 19:05:22,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-25 19:05:22,003 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:22,003 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:22,016 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-08-25 19:05:22,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-08-25 19:05:22,214 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:22,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:22,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1667884396, now seen corresponding path program 1 times [2021-08-25 19:05:22,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-08-25 19:05:22,215 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [265909250] [2021-08-25 19:05:22,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:22,215 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-08-25 19:05:22,215 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-08-25 19:05:22,216 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-08-25 19:05:22,220 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-08-25 19:05:22,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:05:22,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 9 conjunts are in the unsatisfiable core [2021-08-25 19:05:22,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:22,710 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:22,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-25 19:05:22,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:22,892 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-08-25 19:05:22,892 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [265909250] [2021-08-25 19:05:22,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [265909250] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-25 19:05:22,893 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-25 19:05:22,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2021-08-25 19:05:22,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096591823] [2021-08-25 19:05:22,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-25 19:05:22,893 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-08-25 19:05:22,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-25 19:05:22,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-08-25 19:05:22,894 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:23,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:05:23,419 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2021-08-25 19:05:23,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-25 19:05:23,428 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-08-25 19:05:23,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:05:23,429 INFO L225 Difference]: With dead ends: 41 [2021-08-25 19:05:23,429 INFO L226 Difference]: Without dead ends: 27 [2021-08-25 19:05:23,429 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 398.2ms TimeCoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2021-08-25 19:05:23,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-25 19:05:23,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-08-25 19:05:23,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:23,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-08-25 19:05:23,433 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 16 [2021-08-25 19:05:23,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:05:23,433 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-08-25 19:05:23,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:05:23,434 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-08-25 19:05:23,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-25 19:05:23,434 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:05:23,434 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:05:23,451 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-08-25 19:05:23,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-08-25 19:05:23,646 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:05:23,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:05:23,647 INFO L82 PathProgramCache]: Analyzing trace with hash 586911962, now seen corresponding path program 1 times [2021-08-25 19:05:23,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-08-25 19:05:23,647 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1985883197] [2021-08-25 19:05:23,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:05:23,647 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-08-25 19:05:23,647 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-08-25 19:05:23,648 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-08-25 19:05:23,650 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-08-25 19:05:23,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:05:23,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 13 conjunts are in the unsatisfiable core [2021-08-25 19:05:23,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:05:23,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 10 [2021-08-25 19:05:23,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:23,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:23,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:23,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:23,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:23,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:23,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:23,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 41 [2021-08-25 19:05:24,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:24,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:24,081 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:24,368 INFO L354 Elim1Store]: treesize reduction 883, result has 10.4 percent of original size [2021-08-25 19:05:24,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 22 case distinctions, treesize of input 132 treesize of output 141 [2021-08-25 19:05:25,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,305 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:25,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,307 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:25,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,309 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:25,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:25,312 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:25,313 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:25,627 INFO L354 Elim1Store]: treesize reduction 1444, result has 3.5 percent of original size [2021-08-25 19:05:25,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 12 select indices, 12 select index equivalence classes, 6 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 70 case distinctions, treesize of input 290 treesize of output 247 [2021-08-25 19:05:28,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:28,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:28,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:28,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:28,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:28,593 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:28,596 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:28,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:28,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:28,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:05:28,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:05:29,070 INFO L354 Elim1Store]: treesize reduction 1186, result has 6.2 percent of original size [2021-08-25 19:05:29,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 6 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 363 treesize of output 203 [2021-08-25 19:05:29,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:29,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-25 19:05:36,758 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:05:36,758 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-08-25 19:05:36,758 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1985883197] [2021-08-25 19:05:36,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1985883197] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-25 19:05:36,758 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-25 19:05:36,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-08-25 19:05:36,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239673777] [2021-08-25 19:05:36,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-08-25 19:05:36,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-08-25 19:05:36,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-08-25 19:05:36,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=116, Unknown=3, NotChecked=0, Total=156 [2021-08-25 19:05:36,760 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:06:32,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:06:32,223 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2021-08-25 19:06:32,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-08-25 19:06:32,223 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-08-25 19:06:32,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:06:32,224 INFO L225 Difference]: With dead ends: 72 [2021-08-25 19:06:32,224 INFO L226 Difference]: Without dead ends: 70 [2021-08-25 19:06:32,225 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 45554.2ms TimeCoverageRelationStatistics Valid=199, Invalid=598, Unknown=15, NotChecked=0, Total=812 [2021-08-25 19:06:32,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-08-25 19:06:32,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 36. [2021-08-25 19:06:32,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:06:32,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-08-25 19:06:32,232 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 16 [2021-08-25 19:06:32,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:06:32,233 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-08-25 19:06:32,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:06:32,233 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-08-25 19:06:32,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-25 19:06:32,234 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:06:32,234 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:06:32,245 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-08-25 19:06:32,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-08-25 19:06:32,435 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:06:32,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:06:32,435 INFO L82 PathProgramCache]: Analyzing trace with hash 798963152, now seen corresponding path program 1 times [2021-08-25 19:06:32,436 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-08-25 19:06:32,436 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1023877216] [2021-08-25 19:06:32,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-25 19:06:32,436 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-08-25 19:06:32,436 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-08-25 19:06:32,437 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-08-25 19:06:32,438 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-08-25 19:06:32,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-25 19:06:32,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 15 conjunts are in the unsatisfiable core [2021-08-25 19:06:32,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:06:32,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-08-25 19:06:32,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:32,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:32,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:32,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:32,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:32,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:32,944 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:32,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 41 [2021-08-25 19:06:33,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,130 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,139 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,139 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,147 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-08-25 19:06:33,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 6 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 138 treesize of output 127 [2021-08-25 19:06:33,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,560 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,565 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,574 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,577 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,579 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:33,582 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,582 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:33,629 INFO L354 Elim1Store]: treesize reduction 132, result has 15.9 percent of original size [2021-08-25 19:06:33,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 6 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 47 case distinctions, treesize of input 278 treesize of output 201 [2021-08-25 19:06:34,535 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:34,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,549 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:34,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,560 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:34,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:06:34,563 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:06:34,660 INFO L354 Elim1Store]: treesize reduction 92, result has 20.0 percent of original size [2021-08-25 19:06:34,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 6 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 371 treesize of output 141 [2021-08-25 19:06:34,712 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:06:34,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-08-25 19:06:38,951 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-25 19:06:38,952 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-08-25 19:06:38,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1023877216] [2021-08-25 19:06:38,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1023877216] provided 0 perfect and 2 imperfect interpolant sequences [2021-08-25 19:06:38,952 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-25 19:06:38,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-08-25 19:06:38,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966285570] [2021-08-25 19:06:38,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-08-25 19:06:38,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-08-25 19:06:38,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-08-25 19:06:38,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-08-25 19:06:38,954 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:07:08,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-25 19:07:08,176 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2021-08-25 19:07:08,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-08-25 19:07:08,178 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-08-25 19:07:08,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-25 19:07:08,180 INFO L225 Difference]: With dead ends: 83 [2021-08-25 19:07:08,180 INFO L226 Difference]: Without dead ends: 81 [2021-08-25 19:07:08,181 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 17558.6ms TimeCoverageRelationStatistics Valid=220, Invalid=710, Unknown=0, NotChecked=0, Total=930 [2021-08-25 19:07:08,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-08-25 19:07:08,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 50. [2021-08-25 19:07:08,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2040816326530612) internal successors, (59), 49 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:07:08,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2021-08-25 19:07:08,192 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 20 [2021-08-25 19:07:08,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-25 19:07:08,193 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2021-08-25 19:07:08,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-25 19:07:08,193 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2021-08-25 19:07:08,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-08-25 19:07:08,194 INFO L504 BasicCegarLoop]: Found error trace [2021-08-25 19:07:08,194 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-25 19:07:08,204 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-08-25 19:07:08,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-08-25 19:07:08,401 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-25 19:07:08,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-25 19:07:08,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1786143722, now seen corresponding path program 2 times [2021-08-25 19:07:08,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-08-25 19:07:08,403 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1693919171] [2021-08-25 19:07:08,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-25 19:07:08,403 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-08-25 19:07:08,403 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-08-25 19:07:08,404 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-08-25 19:07:08,404 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-08-25 19:07:08,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-25 19:07:08,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-25 19:07:08,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 16 conjunts are in the unsatisfiable core [2021-08-25 19:07:08,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:07:08,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 10 [2021-08-25 19:07:08,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:08,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:08,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:08,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:08,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:08,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:08,883 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:07:08,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 41 [2021-08-25 19:07:08,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:08,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:08,980 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-25 19:07:09,308 INFO L354 Elim1Store]: treesize reduction 883, result has 10.4 percent of original size [2021-08-25 19:07:09,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 22 case distinctions, treesize of input 132 treesize of output 141 [2021-08-25 19:07:09,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:07:09,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-25 19:08:03,347 WARN L207 SmtUtils]: Spent 53.55 s on a formula simplification. DAG size of input: 247 DAG size of output: 103 [2021-08-25 19:08:03,348 INFO L354 Elim1Store]: treesize reduction 1365, result has 19.5 percent of original size [2021-08-25 19:08:03,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 3 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 36 case distinctions, treesize of input 237 treesize of output 417 [2021-08-25 19:10:48,712 WARN L224 Executor]: External (MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-08-25 19:10:48,715 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 101 [2021-08-25 19:10:48,725 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-08-25 19:10:48,725 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1693919171] [2021-08-25 19:10:48,726 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") [2021-08-25 19:10:48,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1855013050] [2021-08-25 19:10:48,726 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-25 19:10:48,726 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-08-25 19:10:48,726 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-08-25 19:10:48,727 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-08-25 19:10:48,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-08-25 19:10:49,366 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-08-25 19:10:49,366 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797287347] [2021-08-25 19:10:49,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-25 19:10:49,366 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-25 19:10:49,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-25 19:10:49,372 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) [2021-08-25 19:10:49,376 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 1 [2021-08-25 19:10:49,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-08-25 19:10:49,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-25 19:10:49,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-25 19:10:49,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 21 conjunts are in the unsatisfiable core [2021-08-25 19:10:49,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-25 19:10:49,767 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken [2021-08-25 19:10:49,767 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2021-08-25 19:10:49,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-08-25 19:10:49,767 ERROR L172 FreeRefinementEngine]: Strategy WOLF failed to provide any proof altough trace is infeasible [2021-08-25 19:10:49,767 INFO L626 BasicCegarLoop]: Counterexample might be feasible [2021-08-25 19:10:49,770 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-25 19:10:49,792 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-08-25 19:10:49,981 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-08-25 19:10:50,172 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,9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-08-25 19:10:50,176 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-25 19:10:50,191 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.08 07:10:50 BoogieIcfgContainer [2021-08-25 19:10:50,191 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-25 19:10:50,192 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-25 19:10:50,192 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-25 19:10:50,192 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-25 19:10:50,193 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.08 07:05:16" (3/4) ... [2021-08-25 19:10:50,195 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-08-25 19:10:50,195 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-25 19:10:50,196 INFO L168 Benchmark]: Toolchain (without parser) took 334855.92 ms. Allocated memory was 56.6 MB in the beginning and 88.1 MB in the end (delta: 31.5 MB). Free memory was 35.2 MB in the beginning and 24.4 MB in the end (delta: 10.9 MB). Peak memory consumption was 42.2 MB. Max. memory is 16.1 GB. [2021-08-25 19:10:50,196 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 56.6 MB. Free memory was 38.9 MB in the beginning and 38.9 MB in the end (delta: 42.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-25 19:10:50,197 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.68 ms. Allocated memory is still 56.6 MB. Free memory was 35.0 MB in the beginning and 40.9 MB in the end (delta: -5.9 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-08-25 19:10:50,197 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.60 ms. Allocated memory is still 56.6 MB. Free memory was 40.8 MB in the beginning and 39.2 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-25 19:10:50,197 INFO L168 Benchmark]: Boogie Preprocessor took 21.30 ms. Allocated memory is still 56.6 MB. Free memory was 39.0 MB in the beginning and 37.6 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-25 19:10:50,198 INFO L168 Benchmark]: RCFGBuilder took 427.22 ms. Allocated memory was 56.6 MB in the beginning and 69.2 MB in the end (delta: 12.6 MB). Free memory was 37.6 MB in the beginning and 49.0 MB in the end (delta: -11.3 MB). Peak memory consumption was 18.1 MB. Max. memory is 16.1 GB. [2021-08-25 19:10:50,198 INFO L168 Benchmark]: TraceAbstraction took 334113.71 ms. Allocated memory was 69.2 MB in the beginning and 88.1 MB in the end (delta: 18.9 MB). Free memory was 48.4 MB in the beginning and 24.4 MB in the end (delta: 24.1 MB). Peak memory consumption was 43.7 MB. Max. memory is 16.1 GB. [2021-08-25 19:10:50,198 INFO L168 Benchmark]: Witness Printer took 3.47 ms. Allocated memory is still 88.1 MB. Free memory is still 24.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-08-25 19:10:50,200 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 56.6 MB. Free memory was 38.9 MB in the beginning and 38.9 MB in the end (delta: 42.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 240.68 ms. Allocated memory is still 56.6 MB. Free memory was 35.0 MB in the beginning and 40.9 MB in the end (delta: -5.9 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 37.60 ms. Allocated memory is still 56.6 MB. Free memory was 40.8 MB in the beginning and 39.2 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 21.30 ms. Allocated memory is still 56.6 MB. Free memory was 39.0 MB in the beginning and 37.6 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 427.22 ms. Allocated memory was 56.6 MB in the beginning and 69.2 MB in the end (delta: 12.6 MB). Free memory was 37.6 MB in the beginning and 49.0 MB in the end (delta: -11.3 MB). Peak memory consumption was 18.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 334113.71 ms. Allocated memory was 69.2 MB in the beginning and 88.1 MB in the end (delta: 18.9 MB). Free memory was 48.4 MB in the beginning and 24.4 MB in the end (delta: 24.1 MB). Peak memory consumption was 43.7 MB. Max. memory is 16.1 GB. * Witness Printer took 3.47 ms. Allocated memory is still 88.1 MB. Free memory is still 24.4 MB. There was no memory consumed. 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 - UnprovableResult [Line: 15]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L19] int N; [L23] N = __VERIFIER_nondet_int() [L24] COND FALSE !(N <= 0) [L13] COND FALSE !(!cond) [L27] long long i; [L28] long long *a = malloc(sizeof(long long)*N); [L29] long long *b = malloc(sizeof(long long)*N); [L31] a[0] = 4 [L32] b[0] = 1 [L34] i=1 [L34] COND TRUE i