./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-invgen/half_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 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/loop-invgen/half_2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 12:18:58,384 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 12:18:58,385 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 12:18:58,446 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 12:18:58,447 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 12:18:58,449 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 12:18:58,453 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 12:18:58,458 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 12:18:58,460 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 12:18:58,464 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 12:18:58,465 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 12:18:58,466 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 12:18:58,466 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 12:18:58,468 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 12:18:58,470 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 12:18:58,471 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 12:18:58,472 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 12:18:58,472 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 12:18:58,476 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 12:18:58,481 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 12:18:58,482 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 12:18:58,483 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 12:18:58,484 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 12:18:58,485 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 12:18:58,490 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 12:18:58,491 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 12:18:58,491 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 12:18:58,492 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 12:18:58,493 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 12:18:58,493 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 12:18:58,494 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 12:18:58,495 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 12:18:58,496 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 12:18:58,497 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 12:18:58,498 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 12:18:58,499 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 12:18:58,499 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 12:18:58,499 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 12:18:58,500 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 12:18:58,500 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 12:18:58,501 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 12:18:58,503 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 12:18:58,532 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 12:18:58,532 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 12:18:58,533 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 12:18:58,533 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 12:18:58,534 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 12:18:58,534 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 12:18:58,535 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 12:18:58,535 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 12:18:58,535 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 12:18:58,535 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 12:18:58,536 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 12:18:58,536 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 12:18:58,536 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 12:18:58,537 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 12:18:58,537 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 12:18:58,537 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 12:18:58,537 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 12:18:58,537 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 12:18:58,538 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 12:18:58,538 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 12:18:58,538 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 12:18:58,538 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 12:18:58,538 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 12:18:58,538 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 12:18:58,539 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:18:58,539 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 12:18:58,539 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 12:18:58,540 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 12:18:58,540 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 12:18:58,541 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 12:18:58,541 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 12:18:58,541 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 12:18:58,541 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 12:18:58,541 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 12:18:58,542 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 [2021-12-21 12:18:58,735 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 12:18:58,760 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 12:18:58,763 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 12:18:58,764 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 12:18:58,764 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 12:18:58,765 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-invgen/half_2.i [2021-12-21 12:18:58,822 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/252a67330/417116ebc1d94504a3e1c1235c70f2d8/FLAG32710199d [2021-12-21 12:18:59,172 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 12:18:59,173 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-invgen/half_2.i [2021-12-21 12:18:59,177 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/252a67330/417116ebc1d94504a3e1c1235c70f2d8/FLAG32710199d [2021-12-21 12:18:59,607 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/252a67330/417116ebc1d94504a3e1c1235c70f2d8 [2021-12-21 12:18:59,609 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 12:18:59,611 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 12:18:59,614 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 12:18:59,614 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 12:18:59,617 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 12:18:59,617 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,618 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58112638 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59, skipping insertion in model container [2021-12-21 12:18:59,618 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,624 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 12:18:59,636 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 12:18:59,766 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2021-12-21 12:18:59,774 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:18:59,778 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 12:18:59,787 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2021-12-21 12:18:59,790 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:18:59,800 INFO L208 MainTranslator]: Completed translation [2021-12-21 12:18:59,800 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59 WrapperNode [2021-12-21 12:18:59,800 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 12:18:59,801 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 12:18:59,801 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 12:18:59,802 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 12:18:59,807 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,813 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,824 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2021-12-21 12:18:59,825 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 12:18:59,825 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 12:18:59,825 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 12:18:59,826 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 12:18:59,832 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,832 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,833 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,833 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,835 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,837 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,844 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,845 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 12:18:59,846 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 12:18:59,846 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 12:18:59,846 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 12:18:59,847 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (1/1) ... [2021-12-21 12:18:59,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:18:59,863 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:18:59,876 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 12:18:59,891 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 12:18:59,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 12:18:59,908 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 12:18:59,908 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 12:18:59,908 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 12:18:59,952 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 12:18:59,953 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 12:19:00,031 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 12:19:00,036 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 12:19:00,036 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-21 12:19:00,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:19:00 BoogieIcfgContainer [2021-12-21 12:19:00,037 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 12:19:00,039 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 12:19:00,039 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 12:19:00,051 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 12:19:00,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 12:18:59" (1/3) ... [2021-12-21 12:19:00,052 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c59661a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:19:00, skipping insertion in model container [2021-12-21 12:19:00,052 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:18:59" (2/3) ... [2021-12-21 12:19:00,052 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c59661a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:19:00, skipping insertion in model container [2021-12-21 12:19:00,053 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:19:00" (3/3) ... [2021-12-21 12:19:00,054 INFO L111 eAbstractionObserver]: Analyzing ICFG half_2.i [2021-12-21 12:19:00,058 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 12:19:00,058 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 12:19:00,089 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 12:19:00,095 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 12:19:00,095 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 12:19:00,105 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 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) [2021-12-21 12:19:00,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-21 12:19:00,109 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:00,110 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:00,110 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:00,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:00,115 INFO L85 PathProgramCache]: Analyzing trace with hash 185205049, now seen corresponding path program 1 times [2021-12-21 12:19:00,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:00,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977354444] [2021-12-21 12:19:00,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:00,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:00,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:00,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:00,235 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:00,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977354444] [2021-12-21 12:19:00,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977354444] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:19:00,237 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:19:00,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 12:19:00,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427970997] [2021-12-21 12:19:00,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:19:00,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-21 12:19:00,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:00,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-21 12:19:00,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:19:00,272 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 13 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) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2021-12-21 12:19:00,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:00,284 INFO L93 Difference]: Finished difference Result 24 states and 31 transitions. [2021-12-21 12:19:00,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-21 12:19:00,285 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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 8 [2021-12-21 12:19:00,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:00,292 INFO L225 Difference]: With dead ends: 24 [2021-12-21 12:19:00,292 INFO L226 Difference]: Without dead ends: 10 [2021-12-21 12:19:00,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-21 12:19:00,299 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:00,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:00,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-12-21 12:19:00,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-12-21 12:19:00,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 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) [2021-12-21 12:19:00,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-12-21 12:19:00,329 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2021-12-21 12:19:00,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:00,330 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-12-21 12:19:00,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2021-12-21 12:19:00,330 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-12-21 12:19:00,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-21 12:19:00,331 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:00,331 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:00,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 12:19:00,332 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:00,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:00,335 INFO L85 PathProgramCache]: Analyzing trace with hash 181510965, now seen corresponding path program 1 times [2021-12-21 12:19:00,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:00,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993045182] [2021-12-21 12:19:00,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:00,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:00,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:00,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:00,490 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:00,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993045182] [2021-12-21 12:19:00,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993045182] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:19:00,491 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:19:00,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 12:19:00,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128520852] [2021-12-21 12:19:00,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:19:00,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:19:00,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:00,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:19:00,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-21 12:19:00,494 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 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) [2021-12-21 12:19:00,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:00,526 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2021-12-21 12:19:00,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 12:19:00,527 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 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 8 [2021-12-21 12:19:00,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:00,528 INFO L225 Difference]: With dead ends: 18 [2021-12-21 12:19:00,528 INFO L226 Difference]: Without dead ends: 16 [2021-12-21 12:19:00,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-12-21 12:19:00,530 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:00,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 17 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:00,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-12-21 12:19:00,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2021-12-21 12:19:00,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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) [2021-12-21 12:19:00,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-12-21 12:19:00,534 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2021-12-21 12:19:00,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:00,534 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-12-21 12:19:00,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 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) [2021-12-21 12:19:00,535 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-12-21 12:19:00,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-12-21 12:19:00,535 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:00,535 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:00,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 12:19:00,536 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:00,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:00,537 INFO L85 PathProgramCache]: Analyzing trace with hash 1383318765, now seen corresponding path program 1 times [2021-12-21 12:19:00,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:00,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362684341] [2021-12-21 12:19:00,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:00,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:00,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:00,613 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:00,614 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:00,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362684341] [2021-12-21 12:19:00,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362684341] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:00,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100110764] [2021-12-21 12:19:00,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:00,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:00,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:00,617 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:00,624 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 12:19:00,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:00,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-21 12:19:00,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:00,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:00,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:01,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:01,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100110764] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:01,120 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:01,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-12-21 12:19:01,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559492724] [2021-12-21 12:19:01,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:01,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-21 12:19:01,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:01,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-21 12:19:01,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:19:01,127 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 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) [2021-12-21 12:19:01,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:01,553 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-12-21 12:19:01,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-21 12:19:01,553 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 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 9 [2021-12-21 12:19:01,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:01,554 INFO L225 Difference]: With dead ends: 41 [2021-12-21 12:19:01,554 INFO L226 Difference]: Without dead ends: 39 [2021-12-21 12:19:01,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=153, Invalid=447, Unknown=0, NotChecked=0, Total=600 [2021-12-21 12:19:01,556 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 38 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:01,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 56 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:01,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-12-21 12:19:01,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 20. [2021-12-21 12:19:01,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 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) [2021-12-21 12:19:01,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-12-21 12:19:01,579 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 9 [2021-12-21 12:19:01,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:01,579 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-12-21 12:19:01,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 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) [2021-12-21 12:19:01,579 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-12-21 12:19:01,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 12:19:01,580 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:01,580 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:01,597 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-21 12:19:01,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:01,781 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:01,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:01,782 INFO L85 PathProgramCache]: Analyzing trace with hash -424251923, now seen corresponding path program 2 times [2021-12-21 12:19:01,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:01,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111159155] [2021-12-21 12:19:01,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:01,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:01,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:01,874 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:01,874 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:01,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111159155] [2021-12-21 12:19:01,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111159155] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:01,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940753291] [2021-12-21 12:19:01,875 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:01,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:01,876 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:01,877 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:01,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 12:19:01,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:01,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:01,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 12:19:01,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:01,984 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:01,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:02,084 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:02,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940753291] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:02,085 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:02,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2021-12-21 12:19:02,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424979775] [2021-12-21 12:19:02,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:02,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 12:19:02,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:02,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 12:19:02,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-12-21 12:19:02,087 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 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) [2021-12-21 12:19:02,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:02,347 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2021-12-21 12:19:02,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 12:19:02,348 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 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 11 [2021-12-21 12:19:02,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:02,349 INFO L225 Difference]: With dead ends: 51 [2021-12-21 12:19:02,349 INFO L226 Difference]: Without dead ends: 49 [2021-12-21 12:19:02,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:19:02,350 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 55 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:02,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 85 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:02,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-12-21 12:19:02,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 19. [2021-12-21 12:19:02,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 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) [2021-12-21 12:19:02,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-12-21 12:19:02,358 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 11 [2021-12-21 12:19:02,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:02,358 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-12-21 12:19:02,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 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) [2021-12-21 12:19:02,359 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-12-21 12:19:02,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 12:19:02,359 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:02,359 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:02,383 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-21 12:19:02,581 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,SelfDestructingSolverStorable3 [2021-12-21 12:19:02,582 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:02,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:02,582 INFO L85 PathProgramCache]: Analyzing trace with hash 34157897, now seen corresponding path program 1 times [2021-12-21 12:19:02,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:02,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815822105] [2021-12-21 12:19:02,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:02,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:02,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:02,692 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:02,692 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:02,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815822105] [2021-12-21 12:19:02,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815822105] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:02,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431145755] [2021-12-21 12:19:02,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:02,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:02,693 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:02,694 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:02,701 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 12:19:02,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:02,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 12:19:02,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:02,782 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:02,782 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:19:02,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431145755] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:19:02,783 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:19:02,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2021-12-21 12:19:02,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956288941] [2021-12-21 12:19:02,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:19:02,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:19:02,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:02,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:19:02,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:19:02,785 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 12:19:02,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:02,820 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-12-21 12:19:02,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 12:19:02,821 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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 11 [2021-12-21 12:19:02,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:02,823 INFO L225 Difference]: With dead ends: 27 [2021-12-21 12:19:02,823 INFO L226 Difference]: Without dead ends: 19 [2021-12-21 12:19:02,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:19:02,825 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 5 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:02,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 24 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:02,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-12-21 12:19:02,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-12-21 12:19:02,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 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) [2021-12-21 12:19:02,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-12-21 12:19:02,835 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 11 [2021-12-21 12:19:02,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:02,836 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-12-21 12:19:02,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 12:19:02,836 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-12-21 12:19:02,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 12:19:02,837 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:02,837 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:02,863 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:03,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:03,049 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:03,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:03,050 INFO L85 PathProgramCache]: Analyzing trace with hash -1874485687, now seen corresponding path program 1 times [2021-12-21 12:19:03,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:03,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104733181] [2021-12-21 12:19:03,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:03,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:03,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:03,177 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:03,177 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:03,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104733181] [2021-12-21 12:19:03,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2104733181] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:03,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626301655] [2021-12-21 12:19:03,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:03,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:03,178 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:03,179 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:03,209 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 12:19:03,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:03,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 12:19:03,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:03,367 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:03,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:03,617 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:03,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626301655] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:03,618 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:03,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2021-12-21 12:19:03,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993323114] [2021-12-21 12:19:03,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:03,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-21 12:19:03,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:03,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-21 12:19:03,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-12-21 12:19:03,620 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 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) [2021-12-21 12:19:04,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:04,125 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2021-12-21 12:19:04,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:19:04,125 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 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 13 [2021-12-21 12:19:04,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:04,126 INFO L225 Difference]: With dead ends: 47 [2021-12-21 12:19:04,126 INFO L226 Difference]: Without dead ends: 28 [2021-12-21 12:19:04,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=240, Invalid=882, Unknown=0, NotChecked=0, Total=1122 [2021-12-21 12:19:04,127 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 66 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:04,127 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 42 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:04,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-12-21 12:19:04,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 18. [2021-12-21 12:19:04,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 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) [2021-12-21 12:19:04,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-12-21 12:19:04,133 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2021-12-21 12:19:04,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:04,133 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-12-21 12:19:04,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 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) [2021-12-21 12:19:04,133 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-12-21 12:19:04,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-21 12:19:04,133 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:04,134 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:04,158 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:04,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:04,334 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:04,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:04,335 INFO L85 PathProgramCache]: Analyzing trace with hash -17212563, now seen corresponding path program 2 times [2021-12-21 12:19:04,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:04,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395424421] [2021-12-21 12:19:04,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:04,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:04,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:04,533 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:04,534 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:04,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395424421] [2021-12-21 12:19:04,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395424421] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:04,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264485497] [2021-12-21 12:19:04,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:04,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:04,534 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:04,536 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:04,565 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 12:19:04,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:04,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:04,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 12:19:04,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:04,767 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:04,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:05,103 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:05,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1264485497] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:05,104 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:05,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 23 [2021-12-21 12:19:05,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672293440] [2021-12-21 12:19:05,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:05,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-21 12:19:05,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:05,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-21 12:19:05,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:19:05,109 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 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) [2021-12-21 12:19:05,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:05,738 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2021-12-21 12:19:05,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-21 12:19:05,739 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 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 17 [2021-12-21 12:19:05,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:05,740 INFO L225 Difference]: With dead ends: 49 [2021-12-21 12:19:05,740 INFO L226 Difference]: Without dead ends: 34 [2021-12-21 12:19:05,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=297, Invalid=1343, Unknown=0, NotChecked=0, Total=1640 [2021-12-21 12:19:05,741 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 61 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:05,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 55 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:05,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-12-21 12:19:05,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-12-21 12:19:05,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 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) [2021-12-21 12:19:05,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-12-21 12:19:05,748 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 17 [2021-12-21 12:19:05,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:05,748 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-12-21 12:19:05,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 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) [2021-12-21 12:19:05,749 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-12-21 12:19:05,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-21 12:19:05,749 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:05,749 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:05,776 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:05,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:05,969 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:05,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:05,969 INFO L85 PathProgramCache]: Analyzing trace with hash 38169965, now seen corresponding path program 3 times [2021-12-21 12:19:05,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:05,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525447209] [2021-12-21 12:19:05,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:05,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:05,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:06,086 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:06,087 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:06,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525447209] [2021-12-21 12:19:06,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525447209] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:06,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334539698] [2021-12-21 12:19:06,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:06,087 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:06,087 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:06,089 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:06,090 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 12:19:06,120 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-21 12:19:06,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:06,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-21 12:19:06,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:06,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:06,506 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:06,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334539698] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:06,507 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:06,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 31 [2021-12-21 12:19:06,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763733877] [2021-12-21 12:19:06,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:06,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-21 12:19:06,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:06,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-21 12:19:06,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=726, Unknown=0, NotChecked=0, Total=930 [2021-12-21 12:19:06,508 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 31 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 31 states have internal predecessors, (48), 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) [2021-12-21 12:19:07,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:07,051 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2021-12-21 12:19:07,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-21 12:19:07,052 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 31 states have internal predecessors, (48), 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 21 [2021-12-21 12:19:07,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:07,052 INFO L225 Difference]: With dead ends: 82 [2021-12-21 12:19:07,052 INFO L226 Difference]: Without dead ends: 80 [2021-12-21 12:19:07,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=750, Invalid=2220, Unknown=0, NotChecked=0, Total=2970 [2021-12-21 12:19:07,054 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 103 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 368 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:07,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 105 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 368 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:19:07,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-12-21 12:19:07,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 37. [2021-12-21 12:19:07,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 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) [2021-12-21 12:19:07,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-12-21 12:19:07,069 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 21 [2021-12-21 12:19:07,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:07,069 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-12-21 12:19:07,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 31 states have internal predecessors, (48), 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) [2021-12-21 12:19:07,070 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-12-21 12:19:07,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-12-21 12:19:07,070 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:07,070 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:07,101 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:07,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:07,293 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:07,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:07,293 INFO L85 PathProgramCache]: Analyzing trace with hash -756727863, now seen corresponding path program 4 times [2021-12-21 12:19:07,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:07,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040683828] [2021-12-21 12:19:07,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:07,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:07,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:07,501 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:07,502 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:07,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040683828] [2021-12-21 12:19:07,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040683828] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:07,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946227004] [2021-12-21 12:19:07,502 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:19:07,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:07,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:07,503 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:07,527 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 12:19:07,549 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:19:07,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:07,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:19:07,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:07,785 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:07,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:08,236 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:08,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946227004] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:08,236 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:08,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 32 [2021-12-21 12:19:08,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319126900] [2021-12-21 12:19:08,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:08,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-21 12:19:08,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:08,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-21 12:19:08,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=824, Unknown=0, NotChecked=0, Total=992 [2021-12-21 12:19:08,238 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 32 states, 32 states have (on average 1.75) internal successors, (56), 32 states have internal predecessors, (56), 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) [2021-12-21 12:19:08,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:08,635 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2021-12-21 12:19:08,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 12:19:08,635 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.75) internal successors, (56), 32 states have internal predecessors, (56), 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 21 [2021-12-21 12:19:08,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:08,636 INFO L225 Difference]: With dead ends: 56 [2021-12-21 12:19:08,636 INFO L226 Difference]: Without dead ends: 38 [2021-12-21 12:19:08,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=260, Invalid=1300, Unknown=0, NotChecked=0, Total=1560 [2021-12-21 12:19:08,637 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 25 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:08,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 46 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:08,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-12-21 12:19:08,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2021-12-21 12:19:08,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 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) [2021-12-21 12:19:08,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-12-21 12:19:08,649 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 21 [2021-12-21 12:19:08,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:08,650 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-12-21 12:19:08,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.75) internal successors, (56), 32 states have internal predecessors, (56), 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) [2021-12-21 12:19:08,650 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-12-21 12:19:08,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-21 12:19:08,651 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:08,651 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:08,677 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:08,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:08,874 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:08,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:08,875 INFO L85 PathProgramCache]: Analyzing trace with hash -946138643, now seen corresponding path program 5 times [2021-12-21 12:19:08,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:08,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810255115] [2021-12-21 12:19:08,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:08,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:08,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:09,172 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:09,172 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:09,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810255115] [2021-12-21 12:19:09,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810255115] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:09,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99816436] [2021-12-21 12:19:09,172 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:19:09,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:09,172 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:09,173 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:09,174 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 12:19:09,219 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-21 12:19:09,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:09,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-21 12:19:09,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:09,488 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:09,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:10,065 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:10,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99816436] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:10,066 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:10,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 33 [2021-12-21 12:19:10,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764626785] [2021-12-21 12:19:10,066 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:10,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-21 12:19:10,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:10,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-21 12:19:10,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=882, Unknown=0, NotChecked=0, Total=1056 [2021-12-21 12:19:10,067 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 33 states have internal predecessors, (63), 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) [2021-12-21 12:19:11,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:11,132 INFO L93 Difference]: Finished difference Result 93 states and 101 transitions. [2021-12-21 12:19:11,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-12-21 12:19:11,133 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 33 states have internal predecessors, (63), 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 25 [2021-12-21 12:19:11,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:11,134 INFO L225 Difference]: With dead ends: 93 [2021-12-21 12:19:11,134 INFO L226 Difference]: Without dead ends: 72 [2021-12-21 12:19:11,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=554, Invalid=2868, Unknown=0, NotChecked=0, Total=3422 [2021-12-21 12:19:11,136 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 97 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:11,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 81 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:19:11,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-12-21 12:19:11,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 35. [2021-12-21 12:19:11,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 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) [2021-12-21 12:19:11,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-12-21 12:19:11,151 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 25 [2021-12-21 12:19:11,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:11,151 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-12-21 12:19:11,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 33 states have internal predecessors, (63), 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) [2021-12-21 12:19:11,152 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-12-21 12:19:11,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-21 12:19:11,152 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:11,152 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:11,175 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-12-21 12:19:11,367 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,SelfDestructingSolverStorable9 [2021-12-21 12:19:11,367 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:11,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:11,368 INFO L85 PathProgramCache]: Analyzing trace with hash 1059897673, now seen corresponding path program 6 times [2021-12-21 12:19:11,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:11,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570285307] [2021-12-21 12:19:11,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:11,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:11,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:11,681 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:11,681 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:11,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570285307] [2021-12-21 12:19:11,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570285307] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:11,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297446650] [2021-12-21 12:19:11,681 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:19:11,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:11,682 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:11,682 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:11,683 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 12:19:11,725 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-21 12:19:11,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:11,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:19:11,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:12,154 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:12,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:12,835 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:12,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297446650] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:12,835 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:12,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 44 [2021-12-21 12:19:12,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802108917] [2021-12-21 12:19:12,836 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:12,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-21 12:19:12,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:12,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-21 12:19:12,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1632, Unknown=0, NotChecked=0, Total=1892 [2021-12-21 12:19:12,837 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 44 states, 44 states have (on average 1.8181818181818181) internal successors, (80), 44 states have internal predecessors, (80), 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) [2021-12-21 12:19:13,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:13,617 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2021-12-21 12:19:13,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:19:13,618 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.8181818181818181) internal successors, (80), 44 states have internal predecessors, (80), 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 29 [2021-12-21 12:19:13,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:13,618 INFO L225 Difference]: With dead ends: 60 [2021-12-21 12:19:13,618 INFO L226 Difference]: Without dead ends: 36 [2021-12-21 12:19:13,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=493, Invalid=3167, Unknown=0, NotChecked=0, Total=3660 [2021-12-21 12:19:13,620 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 39 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:13,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 72 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:19:13,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-21 12:19:13,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2021-12-21 12:19:13,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 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) [2021-12-21 12:19:13,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-12-21 12:19:13,644 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2021-12-21 12:19:13,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:13,644 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-12-21 12:19:13,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.8181818181818181) internal successors, (80), 44 states have internal predecessors, (80), 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) [2021-12-21 12:19:13,644 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-12-21 12:19:13,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-21 12:19:13,645 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:13,646 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:13,662 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:13,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:13,847 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:13,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:13,848 INFO L85 PathProgramCache]: Analyzing trace with hash -138352531, now seen corresponding path program 7 times [2021-12-21 12:19:13,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:13,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736465380] [2021-12-21 12:19:13,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:13,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:13,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:14,218 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 35 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:14,218 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:14,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736465380] [2021-12-21 12:19:14,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736465380] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:14,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705521755] [2021-12-21 12:19:14,219 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:19:14,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:14,219 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:14,220 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:14,221 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 12:19:14,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:14,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-21 12:19:14,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:14,631 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:14,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:15,394 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:15,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705521755] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:15,394 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:15,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 43 [2021-12-21 12:19:15,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241084319] [2021-12-21 12:19:15,395 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:15,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-21 12:19:15,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:15,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-21 12:19:15,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1523, Unknown=0, NotChecked=0, Total=1806 [2021-12-21 12:19:15,396 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 43 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 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) [2021-12-21 12:19:16,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:16,995 INFO L93 Difference]: Finished difference Result 93 states and 104 transitions. [2021-12-21 12:19:16,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-12-21 12:19:16,995 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 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 33 [2021-12-21 12:19:16,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:16,996 INFO L225 Difference]: With dead ends: 93 [2021-12-21 12:19:16,996 INFO L226 Difference]: Without dead ends: 66 [2021-12-21 12:19:16,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1454 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=895, Invalid=4957, Unknown=0, NotChecked=0, Total=5852 [2021-12-21 12:19:16,998 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 144 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 809 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:16,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 116 Invalid, 809 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 12:19:16,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-12-21 12:19:17,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2021-12-21 12:19:17,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.2) internal successors, (54), 45 states have internal predecessors, (54), 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) [2021-12-21 12:19:17,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-12-21 12:19:17,016 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 33 [2021-12-21 12:19:17,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:17,016 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-12-21 12:19:17,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 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) [2021-12-21 12:19:17,016 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-12-21 12:19:17,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-21 12:19:17,017 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:17,017 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:17,034 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:17,218 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,SelfDestructingSolverStorable11 [2021-12-21 12:19:17,218 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:17,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:17,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1196154167, now seen corresponding path program 8 times [2021-12-21 12:19:17,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:17,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284902453] [2021-12-21 12:19:17,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:17,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:17,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:17,699 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:17,699 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:17,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284902453] [2021-12-21 12:19:17,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284902453] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:17,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28442432] [2021-12-21 12:19:17,699 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:17,699 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:17,699 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:17,701 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:17,736 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 12:19:17,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:17,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:17,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-21 12:19:17,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:18,194 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:18,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:19,102 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:19,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28442432] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:19,103 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:19,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 48 [2021-12-21 12:19:19,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294199439] [2021-12-21 12:19:19,103 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:19,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-12-21 12:19:19,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:19,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-12-21 12:19:19,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=1908, Unknown=0, NotChecked=0, Total=2256 [2021-12-21 12:19:19,104 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 48 states, 48 states have (on average 2.0) internal successors, (96), 48 states have internal predecessors, (96), 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) [2021-12-21 12:19:21,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:21,125 INFO L93 Difference]: Finished difference Result 124 states and 136 transitions. [2021-12-21 12:19:21,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-12-21 12:19:21,125 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 48 states have internal predecessors, (96), 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 37 [2021-12-21 12:19:21,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:21,127 INFO L225 Difference]: With dead ends: 124 [2021-12-21 12:19:21,127 INFO L226 Difference]: Without dead ends: 94 [2021-12-21 12:19:21,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1841 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1097, Invalid=6213, Unknown=0, NotChecked=0, Total=7310 [2021-12-21 12:19:21,130 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 164 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 795 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 938 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:21,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 132 Invalid, 938 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 795 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 12:19:21,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-12-21 12:19:21,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 72. [2021-12-21 12:19:21,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.1549295774647887) internal successors, (82), 71 states have internal predecessors, (82), 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) [2021-12-21 12:19:21,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 82 transitions. [2021-12-21 12:19:21,194 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 82 transitions. Word has length 37 [2021-12-21 12:19:21,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:21,194 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 82 transitions. [2021-12-21 12:19:21,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 48 states have internal predecessors, (96), 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) [2021-12-21 12:19:21,194 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 82 transitions. [2021-12-21 12:19:21,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-21 12:19:21,200 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:21,200 INFO L514 BasicCegarLoop]: trace histogram [15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:21,229 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:21,420 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,SelfDestructingSolverStorable12 [2021-12-21 12:19:21,421 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:21,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:21,421 INFO L85 PathProgramCache]: Analyzing trace with hash -826667923, now seen corresponding path program 9 times [2021-12-21 12:19:21,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:21,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703625999] [2021-12-21 12:19:21,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:21,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:21,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:21,700 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 91 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:21,701 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:21,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703625999] [2021-12-21 12:19:21,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703625999] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:21,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668102793] [2021-12-21 12:19:21,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:21,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:21,701 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:21,702 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:21,704 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 12:19:21,751 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-12-21 12:19:21,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:21,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 41 conjunts are in the unsatisfiable core [2021-12-21 12:19:21,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:22,157 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:22,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:22,682 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:22,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668102793] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:22,682 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:22,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 63 [2021-12-21 12:19:22,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360376806] [2021-12-21 12:19:22,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:22,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-12-21 12:19:22,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:22,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-12-21 12:19:22,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=834, Invalid=3072, Unknown=0, NotChecked=0, Total=3906 [2021-12-21 12:19:22,684 INFO L87 Difference]: Start difference. First operand 72 states and 82 transitions. Second operand has 63 states, 63 states have (on average 1.5238095238095237) internal successors, (96), 63 states have internal predecessors, (96), 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) [2021-12-21 12:19:24,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:24,019 INFO L93 Difference]: Finished difference Result 266 states and 288 transitions. [2021-12-21 12:19:24,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-12-21 12:19:24,020 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.5238095238095237) internal successors, (96), 63 states have internal predecessors, (96), 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 41 [2021-12-21 12:19:24,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:24,021 INFO L225 Difference]: With dead ends: 266 [2021-12-21 12:19:24,021 INFO L226 Difference]: Without dead ends: 264 [2021-12-21 12:19:24,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3999 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3111, Invalid=9771, Unknown=0, NotChecked=0, Total=12882 [2021-12-21 12:19:24,024 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 397 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 1033 mSolverCounterSat, 297 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 397 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 1330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 297 IncrementalHoareTripleChecker+Valid, 1033 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:24,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [397 Valid, 219 Invalid, 1330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [297 Valid, 1033 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 12:19:24,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-12-21 12:19:24,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 72. [2021-12-21 12:19:24,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.1126760563380282) internal successors, (79), 71 states have internal predecessors, (79), 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) [2021-12-21 12:19:24,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 79 transitions. [2021-12-21 12:19:24,071 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 79 transitions. Word has length 41 [2021-12-21 12:19:24,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:24,071 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 79 transitions. [2021-12-21 12:19:24,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.5238095238095237) internal successors, (96), 63 states have internal predecessors, (96), 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) [2021-12-21 12:19:24,072 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 79 transitions. [2021-12-21 12:19:24,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-21 12:19:24,072 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:24,072 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:24,092 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:24,283 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,SelfDestructingSolverStorable13 [2021-12-21 12:19:24,284 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:24,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:24,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1395466515, now seen corresponding path program 10 times [2021-12-21 12:19:24,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:24,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824954824] [2021-12-21 12:19:24,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:24,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:24,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:24,726 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 70 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:24,726 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:24,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824954824] [2021-12-21 12:19:24,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824954824] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:24,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857349113] [2021-12-21 12:19:24,726 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:19:24,726 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:24,727 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:24,728 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:24,733 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-21 12:19:24,767 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:19:24,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:24,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 41 conjunts are in the unsatisfiable core [2021-12-21 12:19:24,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:25,201 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:25,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:26,247 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:26,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857349113] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:26,247 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:26,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 53 [2021-12-21 12:19:26,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336653048] [2021-12-21 12:19:26,248 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:26,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-12-21 12:19:26,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:26,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-12-21 12:19:26,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2336, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 12:19:26,250 INFO L87 Difference]: Start difference. First operand 72 states and 79 transitions. Second operand has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 53 states have internal predecessors, (107), 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) [2021-12-21 12:19:28,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:28,768 INFO L93 Difference]: Finished difference Result 277 states and 289 transitions. [2021-12-21 12:19:28,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-12-21 12:19:28,769 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 53 states have internal predecessors, (107), 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 41 [2021-12-21 12:19:28,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:28,769 INFO L225 Difference]: With dead ends: 277 [2021-12-21 12:19:28,770 INFO L226 Difference]: Without dead ends: 244 [2021-12-21 12:19:28,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2272 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1320, Invalid=7610, Unknown=0, NotChecked=0, Total=8930 [2021-12-21 12:19:28,772 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 189 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 928 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 1097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 928 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:28,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 151 Invalid, 1097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 928 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 12:19:28,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-21 12:19:28,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 71. [2021-12-21 12:19:28,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.1) internal successors, (77), 70 states have internal predecessors, (77), 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) [2021-12-21 12:19:28,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 77 transitions. [2021-12-21 12:19:28,817 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 77 transitions. Word has length 41 [2021-12-21 12:19:28,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:28,817 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 77 transitions. [2021-12-21 12:19:28,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 53 states have internal predecessors, (107), 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) [2021-12-21 12:19:28,817 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 77 transitions. [2021-12-21 12:19:28,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-21 12:19:28,818 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:28,818 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:28,834 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-12-21 12:19:29,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-21 12:19:29,019 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:29,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:29,020 INFO L85 PathProgramCache]: Analyzing trace with hash 286483529, now seen corresponding path program 11 times [2021-12-21 12:19:29,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:29,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331093460] [2021-12-21 12:19:29,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:29,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:29,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:29,537 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 92 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:29,538 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:29,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331093460] [2021-12-21 12:19:29,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1331093460] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:29,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536444224] [2021-12-21 12:19:29,539 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:19:29,539 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:29,540 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:29,541 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:29,544 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-21 12:19:29,584 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-12-21 12:19:29,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:29,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 45 conjunts are in the unsatisfiable core [2021-12-21 12:19:29,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:30,078 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:30,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:31,217 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:31,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536444224] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:31,217 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:31,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 58 [2021-12-21 12:19:31,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376985750] [2021-12-21 12:19:31,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:31,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-12-21 12:19:31,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:31,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-12-21 12:19:31,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=2807, Unknown=0, NotChecked=0, Total=3306 [2021-12-21 12:19:31,219 INFO L87 Difference]: Start difference. First operand 71 states and 77 transitions. Second operand has 58 states, 58 states have (on average 2.0344827586206895) internal successors, (118), 58 states have internal predecessors, (118), 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) [2021-12-21 12:19:34,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:34,166 INFO L93 Difference]: Finished difference Result 268 states and 281 transitions. [2021-12-21 12:19:34,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-12-21 12:19:34,167 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.0344827586206895) internal successors, (118), 58 states have internal predecessors, (118), 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 45 [2021-12-21 12:19:34,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:34,168 INFO L225 Difference]: With dead ends: 268 [2021-12-21 12:19:34,168 INFO L226 Difference]: Without dead ends: 232 [2021-12-21 12:19:34,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2747 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1564, Invalid=9148, Unknown=0, NotChecked=0, Total=10712 [2021-12-21 12:19:34,170 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 204 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 1368 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 1573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 1368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:34,170 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 184 Invalid, 1573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 1368 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-21 12:19:34,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-12-21 12:19:34,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 70. [2021-12-21 12:19:34,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.0869565217391304) internal successors, (75), 69 states have internal predecessors, (75), 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) [2021-12-21 12:19:34,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 75 transitions. [2021-12-21 12:19:34,214 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 75 transitions. Word has length 45 [2021-12-21 12:19:34,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:34,214 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 75 transitions. [2021-12-21 12:19:34,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.0344827586206895) internal successors, (118), 58 states have internal predecessors, (118), 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) [2021-12-21 12:19:34,215 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 75 transitions. [2021-12-21 12:19:34,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-21 12:19:34,215 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:34,215 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:34,232 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:34,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:34,416 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:34,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:34,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1446573421, now seen corresponding path program 12 times [2021-12-21 12:19:34,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:34,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324075453] [2021-12-21 12:19:34,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:34,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:34,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:34,982 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 117 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:34,982 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:34,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324075453] [2021-12-21 12:19:34,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324075453] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:34,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892409316] [2021-12-21 12:19:34,982 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:19:34,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:34,983 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:34,985 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:34,986 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-21 12:19:35,029 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-12-21 12:19:35,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:35,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 39 conjunts are in the unsatisfiable core [2021-12-21 12:19:35,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:35,893 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:35,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:37,272 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:37,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892409316] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:37,273 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:37,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 74 [2021-12-21 12:19:37,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314645475] [2021-12-21 12:19:37,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:37,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-12-21 12:19:37,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:37,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-12-21 12:19:37,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=675, Invalid=4727, Unknown=0, NotChecked=0, Total=5402 [2021-12-21 12:19:37,275 INFO L87 Difference]: Start difference. First operand 70 states and 75 transitions. Second operand has 74 states, 74 states have (on average 1.8918918918918919) internal successors, (140), 74 states have internal predecessors, (140), 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) [2021-12-21 12:19:39,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:39,391 INFO L93 Difference]: Finished difference Result 117 states and 123 transitions. [2021-12-21 12:19:39,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-21 12:19:39,391 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.8918918918918919) internal successors, (140), 74 states have internal predecessors, (140), 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 49 [2021-12-21 12:19:39,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:39,392 INFO L225 Difference]: With dead ends: 117 [2021-12-21 12:19:39,392 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 12:19:39,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2479 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1233, Invalid=8867, Unknown=0, NotChecked=0, Total=10100 [2021-12-21 12:19:39,393 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 56 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 935 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 1062 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 935 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:39,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 100 Invalid, 1062 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 935 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 12:19:39,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 12:19:39,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 69. [2021-12-21 12:19:39,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 68 states have internal predecessors, (73), 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) [2021-12-21 12:19:39,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2021-12-21 12:19:39,445 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 49 [2021-12-21 12:19:39,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:39,445 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2021-12-21 12:19:39,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.8918918918918919) internal successors, (140), 74 states have internal predecessors, (140), 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) [2021-12-21 12:19:39,445 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2021-12-21 12:19:39,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-21 12:19:39,445 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:39,445 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:39,461 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:39,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-21 12:19:39,646 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:39,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:39,646 INFO L85 PathProgramCache]: Analyzing trace with hash -2015197751, now seen corresponding path program 13 times [2021-12-21 12:19:39,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:39,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608619576] [2021-12-21 12:19:39,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:39,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:39,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:40,283 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 145 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:40,283 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:40,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608619576] [2021-12-21 12:19:40,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608619576] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:40,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509774370] [2021-12-21 12:19:40,283 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:19:40,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:40,283 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:40,284 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:40,285 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-21 12:19:40,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:40,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 53 conjunts are in the unsatisfiable core [2021-12-21 12:19:40,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:40,958 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:40,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:42,383 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:42,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509774370] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:42,383 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:42,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 68 [2021-12-21 12:19:42,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166601993] [2021-12-21 12:19:42,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:42,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-12-21 12:19:42,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:42,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-12-21 12:19:42,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=3878, Unknown=0, NotChecked=0, Total=4556 [2021-12-21 12:19:42,385 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand has 68 states, 68 states have (on average 2.0588235294117645) internal successors, (140), 68 states have internal predecessors, (140), 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) [2021-12-21 12:19:46,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:46,218 INFO L93 Difference]: Finished difference Result 232 states and 247 transitions. [2021-12-21 12:19:46,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-12-21 12:19:46,219 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.0588235294117645) internal successors, (140), 68 states have internal predecessors, (140), 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 53 [2021-12-21 12:19:46,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:46,220 INFO L225 Difference]: With dead ends: 232 [2021-12-21 12:19:46,220 INFO L226 Difference]: Without dead ends: 190 [2021-12-21 12:19:46,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3829 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=2115, Invalid=12647, Unknown=0, NotChecked=0, Total=14762 [2021-12-21 12:19:46,222 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 261 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 1764 mSolverCounterSat, 268 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 2032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 1764 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:46,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 243 Invalid, 2032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [268 Valid, 1764 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-21 12:19:46,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-12-21 12:19:46,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 68. [2021-12-21 12:19:46,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0597014925373134) internal successors, (71), 67 states have internal predecessors, (71), 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) [2021-12-21 12:19:46,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2021-12-21 12:19:46,266 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 53 [2021-12-21 12:19:46,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:46,266 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2021-12-21 12:19:46,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.0588235294117645) internal successors, (140), 68 states have internal predecessors, (140), 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) [2021-12-21 12:19:46,266 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2021-12-21 12:19:46,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-21 12:19:46,266 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:46,266 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:46,285 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:46,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-21 12:19:46,471 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:46,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:46,471 INFO L85 PathProgramCache]: Analyzing trace with hash 895167469, now seen corresponding path program 14 times [2021-12-21 12:19:46,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:46,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128250858] [2021-12-21 12:19:46,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:46,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:46,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:47,235 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 176 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:47,235 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:47,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128250858] [2021-12-21 12:19:47,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128250858] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:47,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034105788] [2021-12-21 12:19:47,236 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:47,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:47,236 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:47,237 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:47,247 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-21 12:19:47,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:47,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:47,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 82 conjunts are in the unsatisfiable core [2021-12-21 12:19:47,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:48,393 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:48,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:50,145 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:50,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034105788] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:50,145 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:50,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 86 [2021-12-21 12:19:50,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202674808] [2021-12-21 12:19:50,146 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:50,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-12-21 12:19:50,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:50,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-12-21 12:19:50,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=997, Invalid=6313, Unknown=0, NotChecked=0, Total=7310 [2021-12-21 12:19:50,152 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand has 86 states, 86 states have (on average 1.9069767441860466) internal successors, (164), 86 states have internal predecessors, (164), 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) [2021-12-21 12:19:54,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:54,795 INFO L93 Difference]: Finished difference Result 205 states and 221 transitions. [2021-12-21 12:19:54,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-12-21 12:19:54,795 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.9069767441860466) internal successors, (164), 86 states have internal predecessors, (164), 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 57 [2021-12-21 12:19:54,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:54,799 INFO L225 Difference]: With dead ends: 205 [2021-12-21 12:19:54,799 INFO L226 Difference]: Without dead ends: 160 [2021-12-21 12:19:54,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6358 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=2842, Invalid=18038, Unknown=0, NotChecked=0, Total=20880 [2021-12-21 12:19:54,801 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 290 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 1910 mSolverCounterSat, 305 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 2215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 305 IncrementalHoareTripleChecker+Valid, 1910 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:54,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 269 Invalid, 2215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [305 Valid, 1910 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-21 12:19:54,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-12-21 12:19:54,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 67. [2021-12-21 12:19:54,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 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) [2021-12-21 12:19:54,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-12-21 12:19:54,853 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 57 [2021-12-21 12:19:54,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:54,853 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-12-21 12:19:54,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.9069767441860466) internal successors, (164), 86 states have internal predecessors, (164), 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) [2021-12-21 12:19:54,854 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-12-21 12:19:54,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-21 12:19:54,854 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:54,854 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:54,871 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:55,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:55,055 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:55,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:55,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1253672777, now seen corresponding path program 15 times [2021-12-21 12:19:55,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:55,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681568250] [2021-12-21 12:19:55,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:55,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:55,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:55,898 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 210 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:55,898 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:55,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681568250] [2021-12-21 12:19:55,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681568250] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:55,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017947139] [2021-12-21 12:19:55,898 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:55,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:55,899 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:55,899 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:55,901 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-21 12:19:55,954 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-12-21 12:19:55,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:55,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-21 12:19:55,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:57,164 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:57,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:59,073 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:59,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017947139] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:59,075 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:59,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 92 [2021-12-21 12:19:59,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155468660] [2021-12-21 12:19:59,075 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:59,075 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-12-21 12:19:59,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:59,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-12-21 12:19:59,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1020, Invalid=7352, Unknown=0, NotChecked=0, Total=8372 [2021-12-21 12:19:59,076 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 92 states, 92 states have (on average 1.9130434782608696) internal successors, (176), 92 states have internal predecessors, (176), 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)