./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_o20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/id_o20.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a54fd98af675d3e485f3e615c8444fd8c5970ebc ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-26 09:01:02,737 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-26 09:01:02,739 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-26 09:01:02,771 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-26 09:01:02,771 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-26 09:01:02,772 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-26 09:01:02,773 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-26 09:01:02,774 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-26 09:01:02,789 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-26 09:01:02,790 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-26 09:01:02,791 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-26 09:01:02,792 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-26 09:01:02,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-26 09:01:02,793 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-26 09:01:02,794 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-26 09:01:02,795 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-26 09:01:02,795 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-26 09:01:02,796 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-26 09:01:02,797 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-26 09:01:02,799 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-26 09:01:02,800 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-26 09:01:02,803 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-26 09:01:02,804 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-26 09:01:02,805 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-26 09:01:02,807 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-26 09:01:02,807 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-26 09:01:02,807 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-26 09:01:02,808 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-26 09:01:02,808 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-26 09:01:02,808 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-26 09:01:02,809 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-26 09:01:02,809 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-26 09:01:02,810 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-26 09:01:02,810 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-26 09:01:02,811 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-26 09:01:02,811 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-26 09:01:02,812 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-26 09:01:02,812 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-26 09:01:02,812 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-26 09:01:02,813 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-26 09:01:02,813 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-26 09:01:02,818 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-08-26 09:01:02,860 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-26 09:01:02,860 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-26 09:01:02,876 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-26 09:01:02,877 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-26 09:01:02,878 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-26 09:01:02,878 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-26 09:01:02,878 INFO L138 SettingsManager]: * Use SBE=true [2021-08-26 09:01:02,878 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-26 09:01:02,878 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-26 09:01:02,879 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-26 09:01:02,879 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-26 09:01:02,879 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-26 09:01:02,879 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-26 09:01:02,879 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-26 09:01:02,880 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-26 09:01:02,880 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-26 09:01:02,880 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-26 09:01:02,880 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-26 09:01:02,880 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-26 09:01:02,881 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-26 09:01:02,881 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-26 09:01:02,881 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-26 09:01:02,881 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:01:02,881 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-26 09:01:02,882 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-26 09:01:02,882 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-26 09:01:02,888 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-26 09:01:02,888 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-26 09:01:02,888 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-26 09:01:02,888 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-26 09:01:02,888 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a54fd98af675d3e485f3e615c8444fd8c5970ebc [2021-08-26 09:01:03,144 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-26 09:01:03,173 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-26 09:01:03,175 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-26 09:01:03,175 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-26 09:01:03,176 INFO L275 PluginConnector]: CDTParser initialized [2021-08-26 09:01:03,176 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_o20.c [2021-08-26 09:01:03,259 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bcb8576f1/bdb0dbb19b7a43548d5c3ace8a35e5c0/FLAGb9e43b81b [2021-08-26 09:01:03,584 INFO L306 CDTParser]: Found 1 translation units. [2021-08-26 09:01:03,585 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_o20.c [2021-08-26 09:01:03,591 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bcb8576f1/bdb0dbb19b7a43548d5c3ace8a35e5c0/FLAGb9e43b81b [2021-08-26 09:01:04,041 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bcb8576f1/bdb0dbb19b7a43548d5c3ace8a35e5c0 [2021-08-26 09:01:04,043 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-26 09:01:04,044 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-08-26 09:01:04,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-26 09:01:04,050 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-26 09:01:04,056 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-26 09:01:04,056 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,057 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b01d968 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04, skipping insertion in model container [2021-08-26 09:01:04,057 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,071 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-26 09:01:04,088 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-26 09:01:04,257 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_o20.c[516,529] [2021-08-26 09:01:04,259 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:01:04,264 INFO L203 MainTranslator]: Completed pre-run [2021-08-26 09:01:04,276 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_o20.c[516,529] [2021-08-26 09:01:04,276 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-26 09:01:04,285 INFO L208 MainTranslator]: Completed translation [2021-08-26 09:01:04,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04 WrapperNode [2021-08-26 09:01:04,286 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-26 09:01:04,287 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-26 09:01:04,287 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-26 09:01:04,287 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-26 09:01:04,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,296 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,318 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-26 09:01:04,319 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-26 09:01:04,319 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-26 09:01:04,319 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-26 09:01:04,323 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,323 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,324 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,324 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,328 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,328 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,331 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,332 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-26 09:01:04,334 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-26 09:01:04,334 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-26 09:01:04,334 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-26 09:01:04,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (1/1) ... [2021-08-26 09:01:04,347 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-26 09:01:04,353 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:04,371 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-26 09:01:04,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-26 09:01:04,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-26 09:01:04,405 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-26 09:01:04,405 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-26 09:01:04,406 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-08-26 09:01:04,406 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-08-26 09:01:04,406 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-26 09:01:04,546 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-26 09:01:04,546 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-08-26 09:01:04,547 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:04 BoogieIcfgContainer [2021-08-26 09:01:04,547 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-26 09:01:04,548 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-26 09:01:04,548 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-26 09:01:04,551 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-26 09:01:04,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 09:01:04" (1/3) ... [2021-08-26 09:01:04,551 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@568c754a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:01:04, skipping insertion in model container [2021-08-26 09:01:04,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 09:01:04" (2/3) ... [2021-08-26 09:01:04,552 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@568c754a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 09:01:04, skipping insertion in model container [2021-08-26 09:01:04,552 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:04" (3/3) ... [2021-08-26 09:01:04,552 INFO L111 eAbstractionObserver]: Analyzing ICFG id_o20.c [2021-08-26 09:01:04,556 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-26 09:01:04,556 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-26 09:01:04,584 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-26 09:01:04,588 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-26 09:01:04,588 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-08-26 09:01:04,601 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-26 09:01:04,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-26 09:01:04,604 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:04,604 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:04,605 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:04,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:04,608 INFO L82 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2021-08-26 09:01:04,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:04,613 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124351958] [2021-08-26 09:01:04,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:04,614 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:04,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:04,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:04,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:04,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-26 09:01:04,841 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:04,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124351958] [2021-08-26 09:01:04,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124351958] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-26 09:01:04,842 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-26 09:01:04,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-26 09:01:04,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707556554] [2021-08-26 09:01:04,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-08-26 09:01:04,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:04,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-26 09:01:04,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:01:04,854 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-26 09:01:04,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:04,897 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-08-26 09:01:04,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-26 09:01:04,899 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-08-26 09:01:04,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:04,903 INFO L225 Difference]: With dead ends: 28 [2021-08-26 09:01:04,903 INFO L226 Difference]: Without dead ends: 15 [2021-08-26 09:01:04,905 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.5ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-08-26 09:01:04,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-08-26 09:01:04,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-08-26 09:01:04,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 11 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-26 09:01:04,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-08-26 09:01:04,926 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-08-26 09:01:04,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:04,926 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-08-26 09:01:04,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-26 09:01:04,926 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-08-26 09:01:04,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-08-26 09:01:04,927 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:04,927 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:04,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-26 09:01:04,928 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:04,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:04,930 INFO L82 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2021-08-26 09:01:04,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:04,931 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546633600] [2021-08-26 09:01:04,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:04,931 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:04,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:05,051 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:05,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:05,084 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:05,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:05,103 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:01:05,103 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:05,104 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546633600] [2021-08-26 09:01:05,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546633600] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:05,104 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795324690] [2021-08-26 09:01:05,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:05,104 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:05,104 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:05,105 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:05,106 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-26 09:01:05,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:05,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-26 09:01:05,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:05,268 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-26 09:01:05,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795324690] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:05,269 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:05,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-08-26 09:01:05,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826014099] [2021-08-26 09:01:05,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-26 09:01:05,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:05,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-26 09:01:05,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-08-26 09:01:05,271 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-26 09:01:05,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:05,289 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-08-26 09:01:05,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-26 09:01:05,290 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 16 [2021-08-26 09:01:05,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:05,290 INFO L225 Difference]: With dead ends: 22 [2021-08-26 09:01:05,290 INFO L226 Difference]: Without dead ends: 18 [2021-08-26 09:01:05,291 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 57.7ms TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-08-26 09:01:05,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-08-26 09:01:05,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-08-26 09:01:05,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 13 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-08-26 09:01:05,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-08-26 09:01:05,294 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2021-08-26 09:01:05,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:05,295 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-08-26 09:01:05,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-26 09:01:05,295 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-08-26 09:01:05,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-26 09:01:05,295 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:05,295 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:05,316 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:05,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:05,498 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:05,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:05,498 INFO L82 PathProgramCache]: Analyzing trace with hash -41010676, now seen corresponding path program 2 times [2021-08-26 09:01:05,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:05,498 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504036736] [2021-08-26 09:01:05,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:05,499 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:05,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:05,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:05,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:05,609 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:05,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:05,670 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:05,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:05,690 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-26 09:01:05,690 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:05,690 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504036736] [2021-08-26 09:01:05,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504036736] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:05,691 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1232160422] [2021-08-26 09:01:05,691 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:01:05,691 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:05,691 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:05,692 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:05,693 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-26 09:01:05,741 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:01:05,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:05,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 16 conjunts are in the unsatisfiable core [2021-08-26 09:01:05,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:05,859 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-08-26 09:01:05,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1232160422] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:05,859 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:05,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-08-26 09:01:05,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412693520] [2021-08-26 09:01:05,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-26 09:01:05,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:05,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-26 09:01:05,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-08-26 09:01:05,860 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 10 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 09:01:05,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:05,884 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-08-26 09:01:05,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-26 09:01:05,885 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2021-08-26 09:01:05,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:05,885 INFO L225 Difference]: With dead ends: 25 [2021-08-26 09:01:05,885 INFO L226 Difference]: Without dead ends: 21 [2021-08-26 09:01:05,885 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 93.1ms TimeCoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-08-26 09:01:05,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-26 09:01:05,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-26 09:01:05,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 15 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-08-26 09:01:05,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-08-26 09:01:05,889 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2021-08-26 09:01:05,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:05,889 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-08-26 09:01:05,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 7 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-26 09:01:05,889 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-08-26 09:01:05,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-08-26 09:01:05,890 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:05,890 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:05,908 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:06,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-08-26 09:01:06,107 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:06,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:06,107 INFO L82 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 3 times [2021-08-26 09:01:06,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:06,108 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848545997] [2021-08-26 09:01:06,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:06,108 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:06,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,270 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-26 09:01:06,270 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:06,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848545997] [2021-08-26 09:01:06,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848545997] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:06,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34276453] [2021-08-26 09:01:06,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 09:01:06,270 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:06,270 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:06,285 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:06,349 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-26 09:01:06,417 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-08-26 09:01:06,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:06,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 20 conjunts are in the unsatisfiable core [2021-08-26 09:01:06,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:06,553 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-26 09:01:06,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34276453] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:06,553 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:06,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-08-26 09:01:06,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520575615] [2021-08-26 09:01:06,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-26 09:01:06,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:06,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-26 09:01:06,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-08-26 09:01:06,554 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 8 states have internal predecessors, (17), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) [2021-08-26 09:01:06,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:06,587 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-08-26 09:01:06,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-26 09:01:06,587 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 8 states have internal predecessors, (17), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2021-08-26 09:01:06,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:06,588 INFO L225 Difference]: With dead ends: 28 [2021-08-26 09:01:06,588 INFO L226 Difference]: Without dead ends: 24 [2021-08-26 09:01:06,588 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 89.2ms TimeCoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-08-26 09:01:06,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-08-26 09:01:06,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-08-26 09:01:06,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (6), 5 states have call predecessors, (6), 2 states have call successors, (6) [2021-08-26 09:01:06,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-08-26 09:01:06,591 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 28 [2021-08-26 09:01:06,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:06,591 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-08-26 09:01:06,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 8 states have internal predecessors, (17), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) [2021-08-26 09:01:06,591 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-08-26 09:01:06,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-08-26 09:01:06,592 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:06,592 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:06,608 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:06,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:06,808 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:06,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:06,809 INFO L82 PathProgramCache]: Analyzing trace with hash 371264716, now seen corresponding path program 4 times [2021-08-26 09:01:06,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:06,809 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042537638] [2021-08-26 09:01:06,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:06,809 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:06,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,914 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:06,985 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:06,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:07,003 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-08-26 09:01:07,003 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:07,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042537638] [2021-08-26 09:01:07,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042537638] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:07,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1060919752] [2021-08-26 09:01:07,003 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 09:01:07,004 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:07,004 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:07,004 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:07,005 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-26 09:01:07,086 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 09:01:07,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:07,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 24 conjunts are in the unsatisfiable core [2021-08-26 09:01:07,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:07,275 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-08-26 09:01:07,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1060919752] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:07,276 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:07,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2021-08-26 09:01:07,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122568926] [2021-08-26 09:01:07,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-26 09:01:07,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:07,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-26 09:01:07,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-08-26 09:01:07,277 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (5), 5 states have call predecessors, (5), 1 states have call successors, (5) [2021-08-26 09:01:07,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:07,321 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-08-26 09:01:07,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-26 09:01:07,321 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (5), 5 states have call predecessors, (5), 1 states have call successors, (5) Word has length 34 [2021-08-26 09:01:07,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:07,322 INFO L225 Difference]: With dead ends: 31 [2021-08-26 09:01:07,322 INFO L226 Difference]: Without dead ends: 27 [2021-08-26 09:01:07,322 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 115.4ms TimeCoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-08-26 09:01:07,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-08-26 09:01:07,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-08-26 09:01:07,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 19 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (7), 6 states have call predecessors, (7), 2 states have call successors, (7) [2021-08-26 09:01:07,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-08-26 09:01:07,325 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 34 [2021-08-26 09:01:07,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:07,325 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-08-26 09:01:07,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (5), 5 states have call predecessors, (5), 1 states have call successors, (5) [2021-08-26 09:01:07,326 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-08-26 09:01:07,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-08-26 09:01:07,326 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:07,326 INFO L512 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:07,349 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:07,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:07,543 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:07,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:07,544 INFO L82 PathProgramCache]: Analyzing trace with hash -886339242, now seen corresponding path program 5 times [2021-08-26 09:01:07,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:07,544 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879544755] [2021-08-26 09:01:07,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:07,544 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:07,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:07,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:07,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:07,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:07,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:07,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:07,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:07,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:07,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:07,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:07,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:07,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:07,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:07,756 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-08-26 09:01:07,757 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:07,757 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879544755] [2021-08-26 09:01:07,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879544755] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:07,757 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909132942] [2021-08-26 09:01:07,757 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 09:01:07,757 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:07,757 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:07,758 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:07,759 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-26 09:01:07,886 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-08-26 09:01:07,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:07,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 28 conjunts are in the unsatisfiable core [2021-08-26 09:01:07,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:08,080 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-08-26 09:01:08,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909132942] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:08,080 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:08,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2021-08-26 09:01:08,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311658238] [2021-08-26 09:01:08,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-08-26 09:01:08,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:08,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-08-26 09:01:08,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2021-08-26 09:01:08,081 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 16 states, 16 states have (on average 1.3125) internal successors, (21), 10 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (6), 6 states have call predecessors, (6), 1 states have call successors, (6) [2021-08-26 09:01:08,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:08,141 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-08-26 09:01:08,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-08-26 09:01:08,141 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.3125) internal successors, (21), 10 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (6), 6 states have call predecessors, (6), 1 states have call successors, (6) Word has length 40 [2021-08-26 09:01:08,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:08,142 INFO L225 Difference]: With dead ends: 34 [2021-08-26 09:01:08,142 INFO L226 Difference]: Without dead ends: 30 [2021-08-26 09:01:08,142 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 134.9ms TimeCoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2021-08-26 09:01:08,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-08-26 09:01:08,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-08-26 09:01:08,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.05) internal successors, (21), 21 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (8), 7 states have call predecessors, (8), 2 states have call successors, (8) [2021-08-26 09:01:08,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-08-26 09:01:08,146 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 40 [2021-08-26 09:01:08,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:08,146 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-08-26 09:01:08,146 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.3125) internal successors, (21), 10 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (6), 6 states have call predecessors, (6), 1 states have call successors, (6) [2021-08-26 09:01:08,146 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-08-26 09:01:08,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-08-26 09:01:08,147 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:08,147 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:08,166 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:08,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:08,360 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:08,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:08,361 INFO L82 PathProgramCache]: Analyzing trace with hash -918712436, now seen corresponding path program 6 times [2021-08-26 09:01:08,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:08,361 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334955477] [2021-08-26 09:01:08,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:08,361 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:08,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:08,403 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:08,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:08,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:08,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:08,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:08,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:08,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:08,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:08,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:08,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:08,597 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:08,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:08,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:08,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:08,665 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-08-26 09:01:08,665 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:08,665 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334955477] [2021-08-26 09:01:08,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334955477] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:08,665 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966048696] [2021-08-26 09:01:08,666 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-26 09:01:08,666 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:08,666 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:08,666 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:08,667 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-26 09:01:08,814 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-08-26 09:01:08,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:08,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 32 conjunts are in the unsatisfiable core [2021-08-26 09:01:08,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:09,038 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-08-26 09:01:09,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966048696] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:09,039 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:09,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-08-26 09:01:09,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460536263] [2021-08-26 09:01:09,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-26 09:01:09,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:09,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-26 09:01:09,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-08-26 09:01:09,041 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 11 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (7), 7 states have call predecessors, (7), 1 states have call successors, (7) [2021-08-26 09:01:09,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:09,126 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-08-26 09:01:09,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-26 09:01:09,126 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 11 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (7), 7 states have call predecessors, (7), 1 states have call successors, (7) Word has length 46 [2021-08-26 09:01:09,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:09,128 INFO L225 Difference]: With dead ends: 37 [2021-08-26 09:01:09,128 INFO L226 Difference]: Without dead ends: 33 [2021-08-26 09:01:09,129 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 168.8ms TimeCoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-08-26 09:01:09,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-08-26 09:01:09,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-08-26 09:01:09,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 23 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2021-08-26 09:01:09,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-08-26 09:01:09,136 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 46 [2021-08-26 09:01:09,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:09,137 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-08-26 09:01:09,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 11 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (7), 7 states have call predecessors, (7), 1 states have call successors, (7) [2021-08-26 09:01:09,137 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-08-26 09:01:09,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-08-26 09:01:09,137 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:09,137 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:09,156 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:09,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:09,354 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:09,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:09,354 INFO L82 PathProgramCache]: Analyzing trace with hash -626238314, now seen corresponding path program 7 times [2021-08-26 09:01:09,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:09,354 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185799252] [2021-08-26 09:01:09,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:09,354 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:09,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,398 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:09,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,425 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:09,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:09,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,484 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:09,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:09,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:09,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,587 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:09,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:09,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,646 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-26 09:01:09,646 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:09,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185799252] [2021-08-26 09:01:09,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185799252] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:09,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063677660] [2021-08-26 09:01:09,647 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-26 09:01:09,647 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:09,647 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:09,647 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:09,648 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-26 09:01:09,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:09,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 36 conjunts are in the unsatisfiable core [2021-08-26 09:01:09,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:10,060 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-08-26 09:01:10,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063677660] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:10,060 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:10,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2021-08-26 09:01:10,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703555642] [2021-08-26 09:01:10,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-08-26 09:01:10,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:10,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-08-26 09:01:10,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2021-08-26 09:01:10,061 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 20 states, 20 states have (on average 1.25) internal successors, (25), 12 states have internal predecessors, (25), 1 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (8), 8 states have call predecessors, (8), 1 states have call successors, (8) [2021-08-26 09:01:10,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:10,153 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2021-08-26 09:01:10,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-08-26 09:01:10,153 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 12 states have internal predecessors, (25), 1 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (8), 8 states have call predecessors, (8), 1 states have call successors, (8) Word has length 52 [2021-08-26 09:01:10,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:10,154 INFO L225 Difference]: With dead ends: 40 [2021-08-26 09:01:10,154 INFO L226 Difference]: Without dead ends: 36 [2021-08-26 09:01:10,155 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 189.5ms TimeCoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2021-08-26 09:01:10,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-08-26 09:01:10,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-08-26 09:01:10,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 25 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (10), 9 states have call predecessors, (10), 2 states have call successors, (10) [2021-08-26 09:01:10,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-08-26 09:01:10,158 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 52 [2021-08-26 09:01:10,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:10,158 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-08-26 09:01:10,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.25) internal successors, (25), 12 states have internal predecessors, (25), 1 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (8), 8 states have call predecessors, (8), 1 states have call successors, (8) [2021-08-26 09:01:10,158 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-08-26 09:01:10,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-08-26 09:01:10,158 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:10,158 INFO L512 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:10,200 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:10,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:10,377 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:10,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:10,377 INFO L82 PathProgramCache]: Analyzing trace with hash -960511412, now seen corresponding path program 8 times [2021-08-26 09:01:10,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:10,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089233076] [2021-08-26 09:01:10,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:10,378 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:10,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,418 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,511 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,543 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,694 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:10,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:10,718 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-26 09:01:10,718 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:10,718 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089233076] [2021-08-26 09:01:10,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089233076] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:10,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1198569230] [2021-08-26 09:01:10,719 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:01:10,719 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:10,719 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:10,720 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:10,721 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-08-26 09:01:10,907 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:01:10,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:10,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 40 conjunts are in the unsatisfiable core [2021-08-26 09:01:10,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:11,172 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-08-26 09:01:11,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1198569230] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:11,173 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:11,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2021-08-26 09:01:11,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957109226] [2021-08-26 09:01:11,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-08-26 09:01:11,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:11,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-08-26 09:01:11,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-08-26 09:01:11,174 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (9), 9 states have call predecessors, (9), 1 states have call successors, (9) [2021-08-26 09:01:11,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:11,287 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2021-08-26 09:01:11,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-08-26 09:01:11,287 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (9), 9 states have call predecessors, (9), 1 states have call successors, (9) Word has length 58 [2021-08-26 09:01:11,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:11,288 INFO L225 Difference]: With dead ends: 43 [2021-08-26 09:01:11,288 INFO L226 Difference]: Without dead ends: 39 [2021-08-26 09:01:11,289 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 224.4ms TimeCoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-08-26 09:01:11,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-08-26 09:01:11,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-08-26 09:01:11,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 27 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (11), 10 states have call predecessors, (11), 2 states have call successors, (11) [2021-08-26 09:01:11,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-08-26 09:01:11,291 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 58 [2021-08-26 09:01:11,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:11,292 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-08-26 09:01:11,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 13 states have internal predecessors, (27), 1 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (9), 9 states have call predecessors, (9), 1 states have call successors, (9) [2021-08-26 09:01:11,292 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-08-26 09:01:11,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-08-26 09:01:11,293 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:11,293 INFO L512 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:11,314 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:11,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-08-26 09:01:11,514 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:11,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:11,514 INFO L82 PathProgramCache]: Analyzing trace with hash -366706730, now seen corresponding path program 9 times [2021-08-26 09:01:11,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:11,515 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146868441] [2021-08-26 09:01:11,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:11,515 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:11,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,887 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:11,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:11,910 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-08-26 09:01:11,910 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:11,911 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146868441] [2021-08-26 09:01:11,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146868441] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:11,911 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365251491] [2021-08-26 09:01:11,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 09:01:11,911 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:11,911 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:11,912 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:11,913 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-08-26 09:01:12,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-08-26 09:01:12,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:12,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 44 conjunts are in the unsatisfiable core [2021-08-26 09:01:12,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:12,515 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-08-26 09:01:12,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365251491] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:12,515 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:12,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2021-08-26 09:01:12,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572541293] [2021-08-26 09:01:12,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-08-26 09:01:12,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:12,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-08-26 09:01:12,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2021-08-26 09:01:12,517 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 14 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (10), 10 states have call predecessors, (10), 1 states have call successors, (10) [2021-08-26 09:01:12,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:12,652 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2021-08-26 09:01:12,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-08-26 09:01:12,653 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 14 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (10), 10 states have call predecessors, (10), 1 states have call successors, (10) Word has length 64 [2021-08-26 09:01:12,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:12,654 INFO L225 Difference]: With dead ends: 46 [2021-08-26 09:01:12,654 INFO L226 Difference]: Without dead ends: 42 [2021-08-26 09:01:12,654 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 272.2ms TimeCoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2021-08-26 09:01:12,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-08-26 09:01:12,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-08-26 09:01:12,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 29 states have internal predecessors, (29), 2 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (12), 11 states have call predecessors, (12), 2 states have call successors, (12) [2021-08-26 09:01:12,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-08-26 09:01:12,665 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 64 [2021-08-26 09:01:12,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:12,673 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-08-26 09:01:12,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 14 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (10), 10 states have call predecessors, (10), 1 states have call successors, (10) [2021-08-26 09:01:12,674 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-08-26 09:01:12,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-08-26 09:01:12,674 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:12,675 INFO L512 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:12,680 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-08-26 09:01:12,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-08-26 09:01:12,879 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:12,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:12,880 INFO L82 PathProgramCache]: Analyzing trace with hash -1719425780, now seen corresponding path program 10 times [2021-08-26 09:01:12,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:12,880 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685571574] [2021-08-26 09:01:12,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:12,880 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:12,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:12,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:12,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:12,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:12,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,047 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,161 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,298 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:13,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:13,412 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-08-26 09:01:13,412 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:13,412 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685571574] [2021-08-26 09:01:13,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685571574] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:13,413 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99003711] [2021-08-26 09:01:13,413 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 09:01:13,413 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:13,413 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:13,414 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:13,452 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-08-26 09:01:13,781 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 09:01:13,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:13,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 48 conjunts are in the unsatisfiable core [2021-08-26 09:01:13,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:14,129 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-08-26 09:01:14,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99003711] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:14,129 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:14,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2021-08-26 09:01:14,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561084809] [2021-08-26 09:01:14,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-08-26 09:01:14,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:14,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-08-26 09:01:14,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=600, Unknown=0, NotChecked=0, Total=650 [2021-08-26 09:01:14,132 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 26 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 15 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (11), 11 states have call predecessors, (11), 1 states have call successors, (11) [2021-08-26 09:01:14,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:14,281 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2021-08-26 09:01:14,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-08-26 09:01:14,281 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 15 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (11), 11 states have call predecessors, (11), 1 states have call successors, (11) Word has length 70 [2021-08-26 09:01:14,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:14,282 INFO L225 Difference]: With dead ends: 49 [2021-08-26 09:01:14,282 INFO L226 Difference]: Without dead ends: 45 [2021-08-26 09:01:14,282 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 341.6ms TimeCoverageRelationStatistics Valid=50, Invalid=600, Unknown=0, NotChecked=0, Total=650 [2021-08-26 09:01:14,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-08-26 09:01:14,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-08-26 09:01:14,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 31 states have internal predecessors, (31), 2 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (13), 12 states have call predecessors, (13), 2 states have call successors, (13) [2021-08-26 09:01:14,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-08-26 09:01:14,285 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 70 [2021-08-26 09:01:14,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:14,286 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-08-26 09:01:14,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 15 states have internal predecessors, (31), 1 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (11), 11 states have call predecessors, (11), 1 states have call successors, (11) [2021-08-26 09:01:14,286 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-08-26 09:01:14,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-08-26 09:01:14,287 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:14,287 INFO L512 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:14,306 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:14,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-08-26 09:01:14,501 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:14,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:14,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1354232598, now seen corresponding path program 11 times [2021-08-26 09:01:14,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:14,501 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693427355] [2021-08-26 09:01:14,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:14,502 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:14,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,644 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,679 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,791 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,922 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:14,980 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:14,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:15,007 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-08-26 09:01:15,007 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:15,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693427355] [2021-08-26 09:01:15,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693427355] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:15,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969479692] [2021-08-26 09:01:15,008 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 09:01:15,008 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:15,008 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:15,021 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:15,041 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-08-26 09:01:15,689 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-08-26 09:01:15,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:15,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 52 conjunts are in the unsatisfiable core [2021-08-26 09:01:15,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:16,028 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-08-26 09:01:16,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1969479692] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:16,028 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:16,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2021-08-26 09:01:16,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579773991] [2021-08-26 09:01:16,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-08-26 09:01:16,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:16,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-08-26 09:01:16,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=702, Unknown=0, NotChecked=0, Total=756 [2021-08-26 09:01:16,030 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 16 states have internal predecessors, (33), 1 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (12), 12 states have call predecessors, (12), 1 states have call successors, (12) [2021-08-26 09:01:16,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:16,236 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2021-08-26 09:01:16,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-08-26 09:01:16,236 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 16 states have internal predecessors, (33), 1 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (12), 12 states have call predecessors, (12), 1 states have call successors, (12) Word has length 76 [2021-08-26 09:01:16,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:16,237 INFO L225 Difference]: With dead ends: 52 [2021-08-26 09:01:16,237 INFO L226 Difference]: Without dead ends: 48 [2021-08-26 09:01:16,239 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 351.2ms TimeCoverageRelationStatistics Valid=54, Invalid=702, Unknown=0, NotChecked=0, Total=756 [2021-08-26 09:01:16,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-08-26 09:01:16,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-08-26 09:01:16,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.03125) internal successors, (33), 33 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 13 states have return successors, (14), 13 states have call predecessors, (14), 2 states have call successors, (14) [2021-08-26 09:01:16,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-08-26 09:01:16,248 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 76 [2021-08-26 09:01:16,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:16,248 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-08-26 09:01:16,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 16 states have internal predecessors, (33), 1 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (12), 12 states have call predecessors, (12), 1 states have call successors, (12) [2021-08-26 09:01:16,249 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-08-26 09:01:16,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-08-26 09:01:16,251 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:16,251 INFO L512 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:16,262 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:16,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-08-26 09:01:16,456 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:16,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:16,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1734686668, now seen corresponding path program 12 times [2021-08-26 09:01:16,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:16,457 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180251417] [2021-08-26 09:01:16,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:16,457 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:16,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,512 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:16,951 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:16,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:17,016 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:17,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:17,071 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:17,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:17,163 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-08-26 09:01:17,163 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:17,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180251417] [2021-08-26 09:01:17,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180251417] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:17,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432282002] [2021-08-26 09:01:17,164 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-26 09:01:17,164 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:17,164 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:17,165 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:17,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-08-26 09:01:17,698 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-08-26 09:01:17,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:17,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 56 conjunts are in the unsatisfiable core [2021-08-26 09:01:17,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:18,065 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-08-26 09:01:18,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432282002] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:18,066 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:18,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2021-08-26 09:01:18,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836571087] [2021-08-26 09:01:18,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-08-26 09:01:18,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:18,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-08-26 09:01:18,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2021-08-26 09:01:18,067 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (2), 1 states have call predecessors, (2), 13 states have return successors, (13), 13 states have call predecessors, (13), 1 states have call successors, (13) [2021-08-26 09:01:18,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:18,264 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2021-08-26 09:01:18,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-08-26 09:01:18,265 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (2), 1 states have call predecessors, (2), 13 states have return successors, (13), 13 states have call predecessors, (13), 1 states have call successors, (13) Word has length 82 [2021-08-26 09:01:18,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:18,265 INFO L225 Difference]: With dead ends: 55 [2021-08-26 09:01:18,265 INFO L226 Difference]: Without dead ends: 51 [2021-08-26 09:01:18,266 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 473.8ms TimeCoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2021-08-26 09:01:18,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-08-26 09:01:18,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-08-26 09:01:18,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 35 states have internal predecessors, (35), 2 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (15), 14 states have call predecessors, (15), 2 states have call successors, (15) [2021-08-26 09:01:18,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-08-26 09:01:18,268 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 82 [2021-08-26 09:01:18,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:18,269 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-08-26 09:01:18,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 17 states have internal predecessors, (35), 1 states have call successors, (2), 1 states have call predecessors, (2), 13 states have return successors, (13), 13 states have call predecessors, (13), 1 states have call successors, (13) [2021-08-26 09:01:18,269 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-08-26 09:01:18,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-08-26 09:01:18,269 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:18,269 INFO L512 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:18,277 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:18,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-08-26 09:01:18,475 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:18,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:18,475 INFO L82 PathProgramCache]: Analyzing trace with hash -1433749930, now seen corresponding path program 13 times [2021-08-26 09:01:18,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:18,475 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809697578] [2021-08-26 09:01:18,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:18,476 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:18,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,889 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:18,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:18,999 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:19,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:19,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:19,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:19,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:19,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:19,226 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-08-26 09:01:19,226 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:19,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809697578] [2021-08-26 09:01:19,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809697578] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:19,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912832418] [2021-08-26 09:01:19,226 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-26 09:01:19,227 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:19,227 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:19,227 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:19,253 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-08-26 09:01:19,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:19,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 60 conjunts are in the unsatisfiable core [2021-08-26 09:01:19,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:20,032 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-08-26 09:01:20,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912832418] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:20,033 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:20,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2021-08-26 09:01:20,033 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309215730] [2021-08-26 09:01:20,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-08-26 09:01:20,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:20,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-08-26 09:01:20,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=930, Unknown=0, NotChecked=0, Total=992 [2021-08-26 09:01:20,034 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 32 states, 32 states have (on average 1.15625) internal successors, (37), 18 states have internal predecessors, (37), 1 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (14), 14 states have call predecessors, (14), 1 states have call successors, (14) [2021-08-26 09:01:20,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:20,279 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2021-08-26 09:01:20,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-08-26 09:01:20,280 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.15625) internal successors, (37), 18 states have internal predecessors, (37), 1 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (14), 14 states have call predecessors, (14), 1 states have call successors, (14) Word has length 88 [2021-08-26 09:01:20,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:20,280 INFO L225 Difference]: With dead ends: 58 [2021-08-26 09:01:20,280 INFO L226 Difference]: Without dead ends: 54 [2021-08-26 09:01:20,281 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 528.9ms TimeCoverageRelationStatistics Valid=62, Invalid=930, Unknown=0, NotChecked=0, Total=992 [2021-08-26 09:01:20,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-08-26 09:01:20,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-08-26 09:01:20,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 37 states have internal predecessors, (37), 2 states have call successors, (2), 1 states have call predecessors, (2), 15 states have return successors, (16), 15 states have call predecessors, (16), 2 states have call successors, (16) [2021-08-26 09:01:20,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-08-26 09:01:20,284 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 88 [2021-08-26 09:01:20,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:20,284 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-08-26 09:01:20,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.15625) internal successors, (37), 18 states have internal predecessors, (37), 1 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (14), 14 states have call predecessors, (14), 1 states have call successors, (14) [2021-08-26 09:01:20,284 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-08-26 09:01:20,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-08-26 09:01:20,285 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:20,285 INFO L512 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:20,327 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:20,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-08-26 09:01:20,504 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:20,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:20,505 INFO L82 PathProgramCache]: Analyzing trace with hash -1321174388, now seen corresponding path program 14 times [2021-08-26 09:01:20,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:20,505 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734399799] [2021-08-26 09:01:20,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:20,505 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:20,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,655 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,690 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,736 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,775 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,859 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,903 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:20,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:20,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:21,000 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:21,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:21,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:21,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:21,118 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:21,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:21,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:21,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:21,212 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-08-26 09:01:21,213 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:21,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734399799] [2021-08-26 09:01:21,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734399799] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:21,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347727677] [2021-08-26 09:01:21,213 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-26 09:01:21,213 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:21,213 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:21,214 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:21,215 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-08-26 09:01:21,660 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-26 09:01:21,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:21,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 64 conjunts are in the unsatisfiable core [2021-08-26 09:01:21,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:22,093 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-08-26 09:01:22,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347727677] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:22,093 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:22,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2021-08-26 09:01:22,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115591076] [2021-08-26 09:01:22,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-08-26 09:01:22,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:22,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-08-26 09:01:22,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=1056, Unknown=0, NotChecked=0, Total=1122 [2021-08-26 09:01:22,095 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 19 states have internal predecessors, (39), 1 states have call successors, (2), 1 states have call predecessors, (2), 15 states have return successors, (15), 15 states have call predecessors, (15), 1 states have call successors, (15) [2021-08-26 09:01:22,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:22,417 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2021-08-26 09:01:22,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-08-26 09:01:22,417 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 19 states have internal predecessors, (39), 1 states have call successors, (2), 1 states have call predecessors, (2), 15 states have return successors, (15), 15 states have call predecessors, (15), 1 states have call successors, (15) Word has length 94 [2021-08-26 09:01:22,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:22,418 INFO L225 Difference]: With dead ends: 61 [2021-08-26 09:01:22,418 INFO L226 Difference]: Without dead ends: 57 [2021-08-26 09:01:22,419 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 123 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 513.9ms TimeCoverageRelationStatistics Valid=66, Invalid=1056, Unknown=0, NotChecked=0, Total=1122 [2021-08-26 09:01:22,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-08-26 09:01:22,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-08-26 09:01:22,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 39 states have internal predecessors, (39), 2 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (17), 16 states have call predecessors, (17), 2 states have call successors, (17) [2021-08-26 09:01:22,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-08-26 09:01:22,424 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 94 [2021-08-26 09:01:22,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:22,424 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-08-26 09:01:22,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 19 states have internal predecessors, (39), 1 states have call successors, (2), 1 states have call predecessors, (2), 15 states have return successors, (15), 15 states have call predecessors, (15), 1 states have call successors, (15) [2021-08-26 09:01:22,425 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-08-26 09:01:22,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-08-26 09:01:22,425 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:22,426 INFO L512 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:22,455 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:22,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:22,642 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:22,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:22,642 INFO L82 PathProgramCache]: Analyzing trace with hash 415287702, now seen corresponding path program 15 times [2021-08-26 09:01:22,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:22,642 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335962336] [2021-08-26 09:01:22,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:22,642 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:22,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:22,721 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:22,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:22,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:22,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:22,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:22,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:22,879 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:22,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:22,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:22,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,228 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,323 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:23,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:23,577 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-08-26 09:01:23,577 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:23,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335962336] [2021-08-26 09:01:23,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335962336] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:23,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062149358] [2021-08-26 09:01:23,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-08-26 09:01:23,577 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:23,577 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:23,593 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) [2021-08-26 09:01:23,625 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-08-26 09:01:24,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-08-26 09:01:24,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:24,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 68 conjunts are in the unsatisfiable core [2021-08-26 09:01:24,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:24,762 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-08-26 09:01:24,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062149358] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:24,762 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:24,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2021-08-26 09:01:24,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689406027] [2021-08-26 09:01:24,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-08-26 09:01:24,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:24,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-08-26 09:01:24,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=1190, Unknown=0, NotChecked=0, Total=1260 [2021-08-26 09:01:24,765 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 20 states have internal predecessors, (41), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) [2021-08-26 09:01:25,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:25,128 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2021-08-26 09:01:25,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-08-26 09:01:25,129 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 20 states have internal predecessors, (41), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) Word has length 100 [2021-08-26 09:01:25,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:25,130 INFO L225 Difference]: With dead ends: 64 [2021-08-26 09:01:25,130 INFO L226 Difference]: Without dead ends: 60 [2021-08-26 09:01:25,131 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 131 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 563.1ms TimeCoverageRelationStatistics Valid=70, Invalid=1190, Unknown=0, NotChecked=0, Total=1260 [2021-08-26 09:01:25,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-08-26 09:01:25,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-08-26 09:01:25,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.025) internal successors, (41), 41 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (18), 17 states have call predecessors, (18), 2 states have call successors, (18) [2021-08-26 09:01:25,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-08-26 09:01:25,141 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 100 [2021-08-26 09:01:25,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:25,142 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-08-26 09:01:25,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 20 states have internal predecessors, (41), 1 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (16), 16 states have call predecessors, (16), 1 states have call successors, (16) [2021-08-26 09:01:25,143 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-08-26 09:01:25,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-08-26 09:01:25,154 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:25,154 INFO L512 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:25,164 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:25,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-08-26 09:01:25,360 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:25,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:25,368 INFO L82 PathProgramCache]: Analyzing trace with hash 317812044, now seen corresponding path program 16 times [2021-08-26 09:01:25,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:25,368 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937644607] [2021-08-26 09:01:25,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:25,368 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:25,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,418 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,497 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,655 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,863 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:25,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:25,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:26,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:26,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:26,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:26,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:26,170 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:26,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:26,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:26,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:26,284 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-08-26 09:01:26,285 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:26,285 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937644607] [2021-08-26 09:01:26,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937644607] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:26,285 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401638381] [2021-08-26 09:01:26,285 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-08-26 09:01:26,285 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:26,285 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:26,286 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) [2021-08-26 09:01:26,287 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-08-26 09:01:26,871 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-08-26 09:01:26,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:26,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 72 conjunts are in the unsatisfiable core [2021-08-26 09:01:26,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:27,304 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-08-26 09:01:27,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401638381] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:27,304 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:27,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2021-08-26 09:01:27,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027177180] [2021-08-26 09:01:27,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-08-26 09:01:27,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:27,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-08-26 09:01:27,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=1332, Unknown=0, NotChecked=0, Total=1406 [2021-08-26 09:01:27,306 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 21 states have internal predecessors, (43), 1 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (17), 17 states have call predecessors, (17), 1 states have call successors, (17) [2021-08-26 09:01:27,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:27,612 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2021-08-26 09:01:27,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-08-26 09:01:27,612 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 21 states have internal predecessors, (43), 1 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (17), 17 states have call predecessors, (17), 1 states have call successors, (17) Word has length 106 [2021-08-26 09:01:27,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:27,613 INFO L225 Difference]: With dead ends: 67 [2021-08-26 09:01:27,613 INFO L226 Difference]: Without dead ends: 63 [2021-08-26 09:01:27,629 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 646.9ms TimeCoverageRelationStatistics Valid=74, Invalid=1332, Unknown=0, NotChecked=0, Total=1406 [2021-08-26 09:01:27,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-08-26 09:01:27,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-08-26 09:01:27,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 43 states have internal predecessors, (43), 2 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (19), 18 states have call predecessors, (19), 2 states have call successors, (19) [2021-08-26 09:01:27,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-08-26 09:01:27,639 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 106 [2021-08-26 09:01:27,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:27,639 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-08-26 09:01:27,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.131578947368421) internal successors, (43), 21 states have internal predecessors, (43), 1 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (17), 17 states have call predecessors, (17), 1 states have call successors, (17) [2021-08-26 09:01:27,639 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-08-26 09:01:27,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-08-26 09:01:27,640 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:27,640 INFO L512 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:27,661 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:27,840 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,SelfDestructingSolverStorable16 [2021-08-26 09:01:27,840 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:27,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:27,841 INFO L82 PathProgramCache]: Analyzing trace with hash -2122437418, now seen corresponding path program 17 times [2021-08-26 09:01:27,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:27,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092675175] [2021-08-26 09:01:27,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:27,841 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:27,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:27,930 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:27,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:27,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:27,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,024 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,062 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,141 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,277 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,375 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,750 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:28,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:28,853 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-08-26 09:01:28,854 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:28,854 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092675175] [2021-08-26 09:01:28,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092675175] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:28,854 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934672441] [2021-08-26 09:01:28,854 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-08-26 09:01:28,854 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:28,854 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:28,855 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) [2021-08-26 09:01:28,856 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-08-26 09:01:30,157 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-08-26 09:01:30,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:30,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 76 conjunts are in the unsatisfiable core [2021-08-26 09:01:30,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:30,610 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-08-26 09:01:30,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934672441] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:30,611 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:30,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2021-08-26 09:01:30,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086328246] [2021-08-26 09:01:30,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-08-26 09:01:30,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:30,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-08-26 09:01:30,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=1482, Unknown=0, NotChecked=0, Total=1560 [2021-08-26 09:01:30,630 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 40 states, 40 states have (on average 1.125) internal successors, (45), 22 states have internal predecessors, (45), 1 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (18), 18 states have call predecessors, (18), 1 states have call successors, (18) [2021-08-26 09:01:31,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:31,022 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2021-08-26 09:01:31,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-08-26 09:01:31,022 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.125) internal successors, (45), 22 states have internal predecessors, (45), 1 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (18), 18 states have call predecessors, (18), 1 states have call successors, (18) Word has length 112 [2021-08-26 09:01:31,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:31,023 INFO L225 Difference]: With dead ends: 70 [2021-08-26 09:01:31,023 INFO L226 Difference]: Without dead ends: 66 [2021-08-26 09:01:31,024 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 147 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 632.1ms TimeCoverageRelationStatistics Valid=78, Invalid=1482, Unknown=0, NotChecked=0, Total=1560 [2021-08-26 09:01:31,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-08-26 09:01:31,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-08-26 09:01:31,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 45 states have internal predecessors, (45), 2 states have call successors, (2), 1 states have call predecessors, (2), 19 states have return successors, (20), 19 states have call predecessors, (20), 2 states have call successors, (20) [2021-08-26 09:01:31,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-08-26 09:01:31,026 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 112 [2021-08-26 09:01:31,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:31,027 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-08-26 09:01:31,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.125) internal successors, (45), 22 states have internal predecessors, (45), 1 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (18), 18 states have call predecessors, (18), 1 states have call successors, (18) [2021-08-26 09:01:31,027 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-08-26 09:01:31,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-08-26 09:01:31,027 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:31,028 INFO L512 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:31,041 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:31,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-08-26 09:01:31,239 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:31,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:31,239 INFO L82 PathProgramCache]: Analyzing trace with hash 55840780, now seen corresponding path program 18 times [2021-08-26 09:01:31,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:31,240 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940696638] [2021-08-26 09:01:31,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:31,240 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:31,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,342 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,724 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:31,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:31,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:32,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:32,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:32,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:32,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:32,124 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:32,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:32,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:32,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:32,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:32,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:32,323 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:32,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:32,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:32,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:32,443 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-08-26 09:01:32,444 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:32,444 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940696638] [2021-08-26 09:01:32,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940696638] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:32,444 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721710399] [2021-08-26 09:01:32,444 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-08-26 09:01:32,444 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:32,444 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:32,445 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) [2021-08-26 09:01:32,446 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-08-26 09:01:33,685 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-08-26 09:01:33,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-26 09:01:33,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 80 conjunts are in the unsatisfiable core [2021-08-26 09:01:33,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:34,140 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-08-26 09:01:34,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1721710399] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:34,140 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:34,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2021-08-26 09:01:34,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214789738] [2021-08-26 09:01:34,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-08-26 09:01:34,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:34,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-08-26 09:01:34,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=1640, Unknown=0, NotChecked=0, Total=1722 [2021-08-26 09:01:34,142 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 23 states have internal predecessors, (47), 1 states have call successors, (2), 1 states have call predecessors, (2), 19 states have return successors, (19), 19 states have call predecessors, (19), 1 states have call successors, (19) [2021-08-26 09:01:34,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:34,616 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2021-08-26 09:01:34,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-08-26 09:01:34,616 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 23 states have internal predecessors, (47), 1 states have call successors, (2), 1 states have call predecessors, (2), 19 states have return successors, (19), 19 states have call predecessors, (19), 1 states have call successors, (19) Word has length 118 [2021-08-26 09:01:34,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:34,617 INFO L225 Difference]: With dead ends: 73 [2021-08-26 09:01:34,617 INFO L226 Difference]: Without dead ends: 69 [2021-08-26 09:01:34,618 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 757.1ms TimeCoverageRelationStatistics Valid=82, Invalid=1640, Unknown=0, NotChecked=0, Total=1722 [2021-08-26 09:01:34,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-08-26 09:01:34,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-08-26 09:01:34,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 47 states have internal predecessors, (47), 2 states have call successors, (2), 1 states have call predecessors, (2), 20 states have return successors, (21), 20 states have call predecessors, (21), 2 states have call successors, (21) [2021-08-26 09:01:34,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2021-08-26 09:01:34,623 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 118 [2021-08-26 09:01:34,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:34,623 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2021-08-26 09:01:34,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.119047619047619) internal successors, (47), 23 states have internal predecessors, (47), 1 states have call successors, (2), 1 states have call predecessors, (2), 19 states have return successors, (19), 19 states have call predecessors, (19), 1 states have call successors, (19) [2021-08-26 09:01:34,624 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2021-08-26 09:01:34,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-08-26 09:01:34,625 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:34,625 INFO L512 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:34,634 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:34,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:34,833 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:34,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:34,833 INFO L82 PathProgramCache]: Analyzing trace with hash -806952938, now seen corresponding path program 19 times [2021-08-26 09:01:34,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:34,834 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781109959] [2021-08-26 09:01:34,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:34,834 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:34,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:34,879 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:34,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:34,918 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:34,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:34,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:34,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,004 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,048 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,190 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,350 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,435 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,578 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:35,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:35,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-08-26 09:01:36,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-08-26 09:01:36,056 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-26 09:01:36,056 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781109959] [2021-08-26 09:01:36,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1781109959] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:36,056 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148508461] [2021-08-26 09:01:36,056 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-08-26 09:01:36,056 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:36,056 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-26 09:01:36,057 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-26 09:01:36,090 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-08-26 09:01:36,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-26 09:01:36,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 84 conjunts are in the unsatisfiable core [2021-08-26 09:01:36,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-26 09:01:37,323 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-08-26 09:01:37,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148508461] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-26 09:01:37,323 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-26 09:01:37,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2021-08-26 09:01:37,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458914496] [2021-08-26 09:01:37,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-08-26 09:01:37,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-26 09:01:37,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-08-26 09:01:37,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=1806, Unknown=0, NotChecked=0, Total=1892 [2021-08-26 09:01:37,325 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 24 states have internal predecessors, (49), 1 states have call successors, (2), 1 states have call predecessors, (2), 20 states have return successors, (20), 20 states have call predecessors, (20), 1 states have call successors, (20) [2021-08-26 09:01:37,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-26 09:01:37,830 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2021-08-26 09:01:37,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-08-26 09:01:37,831 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 24 states have internal predecessors, (49), 1 states have call successors, (2), 1 states have call predecessors, (2), 20 states have return successors, (20), 20 states have call predecessors, (20), 1 states have call successors, (20) Word has length 124 [2021-08-26 09:01:37,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-26 09:01:37,832 INFO L225 Difference]: With dead ends: 76 [2021-08-26 09:01:37,832 INFO L226 Difference]: Without dead ends: 72 [2021-08-26 09:01:37,832 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 163 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 886.7ms TimeCoverageRelationStatistics Valid=86, Invalid=1806, Unknown=0, NotChecked=0, Total=1892 [2021-08-26 09:01:37,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-08-26 09:01:37,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-08-26 09:01:37,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 49 states have internal predecessors, (49), 2 states have call successors, (2), 1 states have call predecessors, (2), 21 states have return successors, (22), 21 states have call predecessors, (22), 2 states have call successors, (22) [2021-08-26 09:01:37,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-08-26 09:01:37,834 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 124 [2021-08-26 09:01:37,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-26 09:01:37,835 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-08-26 09:01:37,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 24 states have internal predecessors, (49), 1 states have call successors, (2), 1 states have call predecessors, (2), 20 states have return successors, (20), 20 states have call predecessors, (20), 1 states have call successors, (20) [2021-08-26 09:01:37,835 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-08-26 09:01:37,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-08-26 09:01:37,836 INFO L504 BasicCegarLoop]: Found error trace [2021-08-26 09:01:37,836 INFO L512 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-26 09:01:37,854 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-08-26 09:01:38,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-26 09:01:38,055 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-08-26 09:01:38,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-26 09:01:38,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1807457588, now seen corresponding path program 20 times [2021-08-26 09:01:38,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-26 09:01:38,055 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278225919] [2021-08-26 09:01:38,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-26 09:01:38,056 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-26 09:01:38,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:01:38,147 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-26 09:01:38,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-26 09:01:38,230 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-26 09:01:38,230 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-08-26 09:01:38,231 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-08-26 09:01:38,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-08-26 09:01:38,237 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-26 09:01:38,280 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.08 09:01:38 BoogieIcfgContainer [2021-08-26 09:01:38,280 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-26 09:01:38,281 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-26 09:01:38,281 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-26 09:01:38,281 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-26 09:01:38,281 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 09:01:04" (3/4) ... [2021-08-26 09:01:38,282 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-26 09:01:38,313 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-26 09:01:38,314 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-26 09:01:38,314 INFO L168 Benchmark]: Toolchain (without parser) took 34270.43 ms. Allocated memory was 58.7 MB in the beginning and 717.2 MB in the end (delta: 658.5 MB). Free memory was 38.4 MB in the beginning and 614.0 MB in the end (delta: -575.6 MB). Peak memory consumption was 83.9 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:38,315 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 58.7 MB. Free memory was 41.4 MB in the beginning and 41.3 MB in the end (delta: 44.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:01:38,315 INFO L168 Benchmark]: CACSL2BoogieTranslator took 236.39 ms. Allocated memory is still 58.7 MB. Free memory was 38.3 MB in the beginning and 29.1 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:38,315 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.98 ms. Allocated memory is still 58.7 MB. Free memory was 29.0 MB in the beginning and 43.5 MB in the end (delta: -14.5 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:38,315 INFO L168 Benchmark]: Boogie Preprocessor took 13.94 ms. Allocated memory is still 58.7 MB. Free memory was 43.5 MB in the beginning and 42.6 MB in the end (delta: 905.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-26 09:01:38,316 INFO L168 Benchmark]: RCFGBuilder took 213.80 ms. Allocated memory was 58.7 MB in the beginning and 77.6 MB in the end (delta: 18.9 MB). Free memory was 42.6 MB in the beginning and 51.3 MB in the end (delta: -8.6 MB). Peak memory consumption was 10.7 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:38,316 INFO L168 Benchmark]: TraceAbstraction took 33731.77 ms. Allocated memory was 77.6 MB in the beginning and 717.2 MB in the end (delta: 639.6 MB). Free memory was 50.8 MB in the beginning and 620.3 MB in the end (delta: -569.5 MB). Peak memory consumption was 72.4 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:38,316 INFO L168 Benchmark]: Witness Printer took 33.06 ms. Allocated memory is still 717.2 MB. Free memory was 620.3 MB in the beginning and 614.0 MB in the end (delta: 6.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-08-26 09:01:38,317 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 58.7 MB. Free memory was 41.4 MB in the beginning and 41.3 MB in the end (delta: 44.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 236.39 ms. Allocated memory is still 58.7 MB. Free memory was 38.3 MB in the beginning and 29.1 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 30.98 ms. Allocated memory is still 58.7 MB. Free memory was 29.0 MB in the beginning and 43.5 MB in the end (delta: -14.5 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 13.94 ms. Allocated memory is still 58.7 MB. Free memory was 43.5 MB in the beginning and 42.6 MB in the end (delta: 905.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 213.80 ms. Allocated memory was 58.7 MB in the beginning and 77.6 MB in the end (delta: 18.9 MB). Free memory was 42.6 MB in the beginning and 51.3 MB in the end (delta: -8.6 MB). Peak memory consumption was 10.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 33731.77 ms. Allocated memory was 77.6 MB in the beginning and 717.2 MB in the end (delta: 639.6 MB). Free memory was 50.8 MB in the beginning and 620.3 MB in the end (delta: -569.5 MB). Peak memory consumption was 72.4 MB. Max. memory is 16.1 GB. * Witness Printer took 33.06 ms. Allocated memory is still 717.2 MB. Free memory was 620.3 MB in the beginning and 614.0 MB in the end (delta: 6.3 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] unsigned int input = __VERIFIER_nondet_uint(); [L13] CALL, EXPR id(input) VAL [\old(x)=20] [L7] COND FALSE !(x==0) VAL [\old(x)=20, x=20] [L8] CALL, EXPR id(x-1) VAL [\old(x)=19] [L7] COND FALSE !(x==0) VAL [\old(x)=19, x=19] [L8] CALL, EXPR id(x-1) VAL [\old(x)=18] [L7] COND FALSE !(x==0) VAL [\old(x)=18, x=18] [L8] CALL, EXPR id(x-1) VAL [\old(x)=17] [L7] COND FALSE !(x==0) VAL [\old(x)=17, x=17] [L8] CALL, EXPR id(x-1) VAL [\old(x)=16] [L7] COND FALSE !(x==0) VAL [\old(x)=16, x=16] [L8] CALL, EXPR id(x-1) VAL [\old(x)=15] [L7] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L8] CALL, EXPR id(x-1) VAL [\old(x)=14] [L7] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L8] CALL, EXPR id(x-1) VAL [\old(x)=13] [L7] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L8] CALL, EXPR id(x-1) VAL [\old(x)=12] [L7] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L8] CALL, EXPR id(x-1) VAL [\old(x)=11] [L7] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L8] CALL, EXPR id(x-1) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=16, id(x-1)=15, x=16] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=17, id(x-1)=16, x=17] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=18, id(x-1)=17, x=18] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=19, id(x-1)=18, x=19] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=20, id(x-1)=19, x=20] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] unsigned int result = id(input); [L14] COND TRUE result == 20 [L15] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 33652.7ms, OverallIterations: 21, TraceHistogramMax: 21, EmptinessCheckTime: 34.9ms, AutomataDifference: 3900.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 6.5ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 623 SDtfs, 3 SDslu, 13431 SDs, 0 SdLazy, 8807 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2852.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2211 GetRequests, 1733 SyntacticMatches, 19 SemanticMatches, 459 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7067.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=20, InterpolantAutomatonStates: 480, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 103.1ms AutomataMinimizationTime, 20 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 159.4ms SsaConstructionTime, 2915.8ms SatisfiabilityAnalysisTime, 16520.2ms InterpolantComputationTime, 2800 NumberOfCodeBlocks, 2800 NumberOfCodeBlocksAsserted, 142 NumberOfCheckSat, 2631 ConstructedInterpolants, 0 QuantifiedInterpolants, 10475 SizeOfPredicates, 19 NumberOfNonLiveVariables, 3249 ConjunctsInSsa, 912 ConjunctsInUnsatCore, 39 InterpolantComputations, 1 PerfectInterpolantSequences, 7600/15200 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-26 09:01:38,346 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...