./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e19ca921 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/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 00:15:02,210 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 00:15:02,211 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 00:15:02,250 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 00:15:02,259 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 00:15:02,260 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 00:15:02,261 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 00:15:02,262 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 00:15:02,264 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 00:15:02,264 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 00:15:02,265 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 00:15:02,266 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 00:15:02,266 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 00:15:02,267 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 00:15:02,268 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 00:15:02,268 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 00:15:02,269 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 00:15:02,270 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 00:15:02,274 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 00:15:02,280 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 00:15:02,284 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 00:15:02,286 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 00:15:02,288 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 00:15:02,300 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 00:15:02,302 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 00:15:02,303 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 00:15:02,304 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 00:15:02,304 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 00:15:02,305 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 00:15:02,306 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 00:15:02,306 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 00:15:02,306 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 00:15:02,307 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 00:15:02,308 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 00:15:02,309 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 00:15:02,309 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 00:15:02,310 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 00:15:02,311 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 00:15:02,311 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 00:15:02,312 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 00:15:02,312 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 00:15:02,313 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-22 00:15:02,341 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 00:15:02,342 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 00:15:02,342 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 00:15:02,342 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 00:15:02,343 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 00:15:02,343 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 00:15:02,343 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 00:15:02,344 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 00:15:02,344 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 00:15:02,351 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 00:15:02,351 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 00:15:02,352 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 00:15:02,352 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 00:15:02,352 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 00:15:02,352 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 00:15:02,352 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 00:15:02,352 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 00:15:02,353 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-22 00:15:02,353 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 00:15:02,353 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 00:15:02,353 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 00:15:02,353 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 00:15:02,353 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 00:15:02,354 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 00:15:02,354 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 00:15:02,354 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 00:15:02,354 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 00:15:02,354 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 00:15:02,355 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 00:15:02,355 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 00:15:02,356 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 00:15:02,356 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 [2021-12-22 00:15:02,551 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 00:15:02,570 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 00:15:02,572 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 00:15:02,573 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 00:15:02,573 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 00:15:02,574 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2021-12-22 00:15:02,623 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07323620d/875ed10759a440c1b4057dedc69d144a/FLAG2783ceaee [2021-12-22 00:15:03,071 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 00:15:03,074 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2021-12-22 00:15:03,084 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07323620d/875ed10759a440c1b4057dedc69d144a/FLAG2783ceaee [2021-12-22 00:15:03,098 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07323620d/875ed10759a440c1b4057dedc69d144a [2021-12-22 00:15:03,100 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 00:15:03,101 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 00:15:03,102 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 00:15:03,102 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 00:15:03,105 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 00:15:03,106 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,106 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@70e3efc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03, skipping insertion in model container [2021-12-22 00:15:03,107 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,111 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 00:15:03,131 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 00:15:03,405 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i[24640,24653] [2021-12-22 00:15:03,408 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 00:15:03,416 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 00:15:03,456 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i[24640,24653] [2021-12-22 00:15:03,456 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 00:15:03,478 INFO L208 MainTranslator]: Completed translation [2021-12-22 00:15:03,480 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03 WrapperNode [2021-12-22 00:15:03,480 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 00:15:03,481 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 00:15:03,481 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 00:15:03,481 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 00:15:03,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,510 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,536 INFO L137 Inliner]: procedures = 127, calls = 47, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 140 [2021-12-22 00:15:03,536 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 00:15:03,537 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 00:15:03,537 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 00:15:03,537 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 00:15:03,543 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,543 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,555 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,556 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,568 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,575 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,576 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,585 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 00:15:03,585 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 00:15:03,586 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 00:15:03,586 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 00:15:03,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (1/1) ... [2021-12-22 00:15:03,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 00:15:03,600 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:03,634 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 00:15:03,644 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 00:15:03,670 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-22 00:15:03,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-22 00:15:03,671 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-12-22 00:15:03,671 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-12-22 00:15:03,671 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 00:15:03,671 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 00:15:03,671 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-22 00:15:03,672 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 00:15:03,672 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 00:15:03,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 00:15:03,672 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-22 00:15:03,672 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 00:15:03,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 00:15:03,672 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 00:15:03,797 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 00:15:03,804 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 00:15:04,049 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 00:15:04,053 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 00:15:04,054 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-22 00:15:04,056 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 12:15:04 BoogieIcfgContainer [2021-12-22 00:15:04,056 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 00:15:04,057 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 00:15:04,057 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 00:15:04,059 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 00:15:04,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 12:15:03" (1/3) ... [2021-12-22 00:15:04,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@712b18d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 12:15:04, skipping insertion in model container [2021-12-22 00:15:04,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:03" (2/3) ... [2021-12-22 00:15:04,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@712b18d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 12:15:04, skipping insertion in model container [2021-12-22 00:15:04,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 12:15:04" (3/3) ... [2021-12-22 00:15:04,062 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_prepend_equal.i [2021-12-22 00:15:04,065 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 00:15:04,065 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 60 error locations. [2021-12-22 00:15:04,101 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 00:15:04,106 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 00:15:04,107 INFO L340 AbstractCegarLoop]: Starting to check reachability of 60 error locations. [2021-12-22 00:15:04,120 INFO L276 IsEmpty]: Start isEmpty. Operand has 130 states, 65 states have (on average 2.1076923076923078) internal successors, (137), 125 states have internal predecessors, (137), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:04,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-22 00:15:04,130 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:04,135 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-22 00:15:04,135 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:04,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:04,139 INFO L85 PathProgramCache]: Analyzing trace with hash 895303154, now seen corresponding path program 1 times [2021-12-22 00:15:04,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:04,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119666648] [2021-12-22 00:15:04,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:04,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:04,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:04,298 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:04,299 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:04,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119666648] [2021-12-22 00:15:04,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119666648] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:04,300 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:04,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 00:15:04,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816201292] [2021-12-22 00:15:04,302 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:04,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 00:15:04,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:04,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 00:15:04,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:04,333 INFO L87 Difference]: Start difference. First operand has 130 states, 65 states have (on average 2.1076923076923078) internal successors, (137), 125 states have internal predecessors, (137), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 00:15:04,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:04,497 INFO L93 Difference]: Finished difference Result 127 states and 136 transitions. [2021-12-22 00:15:04,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 00:15:04,499 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-22 00:15:04,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:04,506 INFO L225 Difference]: With dead ends: 127 [2021-12-22 00:15:04,506 INFO L226 Difference]: Without dead ends: 124 [2021-12-22 00:15:04,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:04,511 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 10 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:04,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 193 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 00:15:04,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-12-22 00:15:04,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-12-22 00:15:04,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 63 states have (on average 2.0) internal successors, (126), 119 states have internal predecessors, (126), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:04,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 132 transitions. [2021-12-22 00:15:04,550 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 132 transitions. Word has length 6 [2021-12-22 00:15:04,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:04,551 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 132 transitions. [2021-12-22 00:15:04,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 00:15:04,551 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 132 transitions. [2021-12-22 00:15:04,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-22 00:15:04,551 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:04,552 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-22 00:15:04,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 00:15:04,553 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:04,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:04,553 INFO L85 PathProgramCache]: Analyzing trace with hash 895303155, now seen corresponding path program 1 times [2021-12-22 00:15:04,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:04,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295918835] [2021-12-22 00:15:04,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:04,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:04,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:04,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:04,632 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:04,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295918835] [2021-12-22 00:15:04,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295918835] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:04,633 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:04,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 00:15:04,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413336527] [2021-12-22 00:15:04,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:04,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 00:15:04,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:04,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 00:15:04,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:04,636 INFO L87 Difference]: Start difference. First operand 124 states and 132 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 00:15:04,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:04,712 INFO L93 Difference]: Finished difference Result 121 states and 129 transitions. [2021-12-22 00:15:04,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 00:15:04,713 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-22 00:15:04,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:04,713 INFO L225 Difference]: With dead ends: 121 [2021-12-22 00:15:04,714 INFO L226 Difference]: Without dead ends: 121 [2021-12-22 00:15:04,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:04,715 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 5 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:04,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 195 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 00:15:04,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-12-22 00:15:04,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2021-12-22 00:15:04,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 116 states have internal predecessors, (123), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:04,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 129 transitions. [2021-12-22 00:15:04,724 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 129 transitions. Word has length 6 [2021-12-22 00:15:04,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:04,724 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 129 transitions. [2021-12-22 00:15:04,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 00:15:04,725 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 129 transitions. [2021-12-22 00:15:04,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-22 00:15:04,725 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:04,725 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:04,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-22 00:15:04,726 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:04,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:04,727 INFO L85 PathProgramCache]: Analyzing trace with hash -1495162356, now seen corresponding path program 1 times [2021-12-22 00:15:04,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:04,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963054250] [2021-12-22 00:15:04,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:04,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:04,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:04,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:04,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:04,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:04,812 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:04,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963054250] [2021-12-22 00:15:04,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963054250] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:04,813 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:04,813 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 00:15:04,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597913716] [2021-12-22 00:15:04,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:04,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 00:15:04,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:04,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 00:15:04,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 00:15:04,814 INFO L87 Difference]: Start difference. First operand 121 states and 129 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-12-22 00:15:04,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:04,931 INFO L93 Difference]: Finished difference Result 132 states and 142 transitions. [2021-12-22 00:15:04,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 00:15:04,932 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 14 [2021-12-22 00:15:04,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:04,933 INFO L225 Difference]: With dead ends: 132 [2021-12-22 00:15:04,935 INFO L226 Difference]: Without dead ends: 132 [2021-12-22 00:15:04,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 00:15:04,936 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 10 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:04,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 292 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 00:15:04,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-12-22 00:15:04,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 122. [2021-12-22 00:15:04,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 64 states have (on average 1.9375) internal successors, (124), 117 states have internal predecessors, (124), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:04,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2021-12-22 00:15:04,946 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 14 [2021-12-22 00:15:04,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:04,946 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2021-12-22 00:15:04,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-12-22 00:15:04,947 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2021-12-22 00:15:04,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-22 00:15:04,947 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:04,947 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:04,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-22 00:15:04,948 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:04,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:04,948 INFO L85 PathProgramCache]: Analyzing trace with hash 2091192736, now seen corresponding path program 1 times [2021-12-22 00:15:04,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:04,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783705713] [2021-12-22 00:15:04,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:04,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:04,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,000 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:05,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:05,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,054 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 00:15:05,054 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:05,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783705713] [2021-12-22 00:15:05,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783705713] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:05,055 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:05,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 00:15:05,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114908114] [2021-12-22 00:15:05,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:05,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 00:15:05,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:05,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 00:15:05,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:05,058 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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) [2021-12-22 00:15:05,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:05,282 INFO L93 Difference]: Finished difference Result 122 states and 131 transitions. [2021-12-22 00:15:05,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 00:15:05,282 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 24 [2021-12-22 00:15:05,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:05,284 INFO L225 Difference]: With dead ends: 122 [2021-12-22 00:15:05,284 INFO L226 Difference]: Without dead ends: 122 [2021-12-22 00:15:05,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-22 00:15:05,285 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 21 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:05,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 394 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 00:15:05,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-12-22 00:15:05,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-12-22 00:15:05,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 64 states have (on average 1.921875) internal successors, (123), 116 states have internal predecessors, (123), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:05,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 129 transitions. [2021-12-22 00:15:05,290 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 129 transitions. Word has length 24 [2021-12-22 00:15:05,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:05,290 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 129 transitions. [2021-12-22 00:15:05,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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) [2021-12-22 00:15:05,291 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 129 transitions. [2021-12-22 00:15:05,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-22 00:15:05,291 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:05,291 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:05,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-22 00:15:05,291 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:05,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:05,292 INFO L85 PathProgramCache]: Analyzing trace with hash 2091192737, now seen corresponding path program 1 times [2021-12-22 00:15:05,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:05,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000306146] [2021-12-22 00:15:05,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:05,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:05,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:05,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:05,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,436 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:05,436 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:05,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000306146] [2021-12-22 00:15:05,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000306146] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:05,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:05,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 00:15:05,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89304040] [2021-12-22 00:15:05,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:05,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 00:15:05,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:05,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 00:15:05,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:05,439 INFO L87 Difference]: Start difference. First operand 121 states and 129 transitions. Second operand has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-12-22 00:15:05,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:05,640 INFO L93 Difference]: Finished difference Result 121 states and 130 transitions. [2021-12-22 00:15:05,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 00:15:05,641 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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 24 [2021-12-22 00:15:05,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:05,642 INFO L225 Difference]: With dead ends: 121 [2021-12-22 00:15:05,642 INFO L226 Difference]: Without dead ends: 121 [2021-12-22 00:15:05,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-22 00:15:05,643 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 19 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:05,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 418 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 00:15:05,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-12-22 00:15:05,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2021-12-22 00:15:05,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 64 states have (on average 1.90625) internal successors, (122), 115 states have internal predecessors, (122), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:05,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 128 transitions. [2021-12-22 00:15:05,647 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 128 transitions. Word has length 24 [2021-12-22 00:15:05,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:05,647 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 128 transitions. [2021-12-22 00:15:05,648 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-12-22 00:15:05,648 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 128 transitions. [2021-12-22 00:15:05,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-22 00:15:05,648 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:05,648 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:05,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-22 00:15:05,648 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:05,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:05,649 INFO L85 PathProgramCache]: Analyzing trace with hash -408475519, now seen corresponding path program 1 times [2021-12-22 00:15:05,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:05,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593907052] [2021-12-22 00:15:05,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:05,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:05,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,705 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:05,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:05,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,774 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:05,775 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:05,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593907052] [2021-12-22 00:15:05,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593907052] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:05,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378507710] [2021-12-22 00:15:05,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:05,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:05,776 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:05,777 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 00:15:05,778 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-22 00:15:05,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:05,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-22 00:15:05,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:05,943 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:06,134 INFO L353 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-22 00:15:06,135 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-12-22 00:15:06,145 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:06,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:06,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378507710] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:06,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:06,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-12-22 00:15:06,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197399734] [2021-12-22 00:15:06,188 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:06,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-22 00:15:06,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:06,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-22 00:15:06,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-12-22 00:15:06,189 INFO L87 Difference]: Start difference. First operand 120 states and 128 transitions. Second operand has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:06,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:06,446 INFO L93 Difference]: Finished difference Result 145 states and 156 transitions. [2021-12-22 00:15:06,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 00:15:06,446 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-12-22 00:15:06,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:06,447 INFO L225 Difference]: With dead ends: 145 [2021-12-22 00:15:06,447 INFO L226 Difference]: Without dead ends: 145 [2021-12-22 00:15:06,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-12-22 00:15:06,448 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 102 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:06,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 414 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 388 Invalid, 0 Unknown, 75 Unchecked, 0.2s Time] [2021-12-22 00:15:06,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-12-22 00:15:06,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 125. [2021-12-22 00:15:06,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 68 states have (on average 1.8823529411764706) internal successors, (128), 119 states have internal predecessors, (128), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:06,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 136 transitions. [2021-12-22 00:15:06,453 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 136 transitions. Word has length 26 [2021-12-22 00:15:06,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:06,453 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 136 transitions. [2021-12-22 00:15:06,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:06,453 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 136 transitions. [2021-12-22 00:15:06,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-22 00:15:06,454 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:06,454 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:06,492 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:06,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-12-22 00:15:06,667 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:06,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:06,668 INFO L85 PathProgramCache]: Analyzing trace with hash -408475518, now seen corresponding path program 1 times [2021-12-22 00:15:06,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:06,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997447906] [2021-12-22 00:15:06,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:06,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:06,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:06,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:06,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:06,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:06,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:06,833 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:06,833 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:06,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997447906] [2021-12-22 00:15:06,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997447906] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:06,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197031865] [2021-12-22 00:15:06,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:06,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:06,834 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:06,835 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 00:15:06,836 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-22 00:15:06,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:06,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-22 00:15:06,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:06,960 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:06,964 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:07,183 INFO L353 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-12-22 00:15:07,184 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2021-12-22 00:15:07,202 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 00:15:07,202 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 00:15:07,257 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:07,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:07,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197031865] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:07,383 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:07,383 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-12-22 00:15:07,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321602783] [2021-12-22 00:15:07,383 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:07,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-22 00:15:07,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:07,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-22 00:15:07,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-12-22 00:15:07,384 INFO L87 Difference]: Start difference. First operand 125 states and 136 transitions. Second operand has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 14 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-22 00:15:07,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:07,835 INFO L93 Difference]: Finished difference Result 127 states and 137 transitions. [2021-12-22 00:15:07,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 00:15:07,835 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 14 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 26 [2021-12-22 00:15:07,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:07,836 INFO L225 Difference]: With dead ends: 127 [2021-12-22 00:15:07,836 INFO L226 Difference]: Without dead ends: 127 [2021-12-22 00:15:07,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-12-22 00:15:07,837 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 16 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:07,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 600 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 803 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 00:15:07,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-12-22 00:15:07,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2021-12-22 00:15:07,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 68 states have (on average 1.8676470588235294) internal successors, (127), 119 states have internal predecessors, (127), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:07,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 135 transitions. [2021-12-22 00:15:07,841 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 135 transitions. Word has length 26 [2021-12-22 00:15:07,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:07,842 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 135 transitions. [2021-12-22 00:15:07,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 14 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-22 00:15:07,842 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 135 transitions. [2021-12-22 00:15:07,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-22 00:15:07,842 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:07,843 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:07,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:08,043 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,SelfDestructingSolverStorable6 [2021-12-22 00:15:08,043 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:08,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:08,044 INFO L85 PathProgramCache]: Analyzing trace with hash -1702795689, now seen corresponding path program 1 times [2021-12-22 00:15:08,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:08,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799421513] [2021-12-22 00:15:08,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:08,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:08,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:08,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:08,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:08,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:08,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:08,134 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:08,135 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:08,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799421513] [2021-12-22 00:15:08,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799421513] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:08,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979376992] [2021-12-22 00:15:08,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:08,135 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:08,135 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:08,136 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 00:15:08,137 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-22 00:15:08,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:08,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-22 00:15:08,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:08,288 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:08,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:08,366 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:08,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979376992] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:15:08,367 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:15:08,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 7 [2021-12-22 00:15:08,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632042947] [2021-12-22 00:15:08,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:08,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 00:15:08,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:08,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 00:15:08,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:08,368 INFO L87 Difference]: Start difference. First operand 125 states and 135 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 00:15:08,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:08,463 INFO L93 Difference]: Finished difference Result 126 states and 135 transitions. [2021-12-22 00:15:08,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 00:15:08,464 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-12-22 00:15:08,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:08,465 INFO L225 Difference]: With dead ends: 126 [2021-12-22 00:15:08,465 INFO L226 Difference]: Without dead ends: 126 [2021-12-22 00:15:08,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-22 00:15:08,466 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 4 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 616 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:08,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 616 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 00:15:08,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-12-22 00:15:08,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-12-22 00:15:08,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 68 states have (on average 1.8529411764705883) internal successors, (126), 119 states have internal predecessors, (126), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:08,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2021-12-22 00:15:08,470 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 28 [2021-12-22 00:15:08,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:08,470 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2021-12-22 00:15:08,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 00:15:08,471 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2021-12-22 00:15:08,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 00:15:08,471 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:08,471 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:08,490 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:08,687 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:08,687 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:08,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:08,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1251839470, now seen corresponding path program 1 times [2021-12-22 00:15:08,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:08,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069739188] [2021-12-22 00:15:08,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:08,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:08,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:08,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:08,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:08,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:08,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:08,753 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-22 00:15:08,753 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:08,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069739188] [2021-12-22 00:15:08,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069739188] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:08,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2029436253] [2021-12-22 00:15:08,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:08,754 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:08,754 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:08,755 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 00:15:08,755 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-22 00:15:08,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:08,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-22 00:15:08,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:08,900 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-22 00:15:08,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:08,910 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 00:15:08,911 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 11 [2021-12-22 00:15:08,941 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-22 00:15:08,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2029436253] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:15:08,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:15:08,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 5 [2021-12-22 00:15:08,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284790409] [2021-12-22 00:15:08,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:08,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 00:15:08,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:08,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 00:15:08,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:15:08,943 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:09,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:09,077 INFO L93 Difference]: Finished difference Result 130 states and 141 transitions. [2021-12-22 00:15:09,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 00:15:09,077 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-12-22 00:15:09,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:09,078 INFO L225 Difference]: With dead ends: 130 [2021-12-22 00:15:09,078 INFO L226 Difference]: Without dead ends: 130 [2021-12-22 00:15:09,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-12-22 00:15:09,080 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 13 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:09,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 289 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 00:15:09,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-12-22 00:15:09,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 128. [2021-12-22 00:15:09,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 71 states have (on average 1.8450704225352113) internal successors, (131), 122 states have internal predecessors, (131), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:09,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 139 transitions. [2021-12-22 00:15:09,093 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 139 transitions. Word has length 29 [2021-12-22 00:15:09,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:09,094 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 139 transitions. [2021-12-22 00:15:09,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:09,094 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 139 transitions. [2021-12-22 00:15:09,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 00:15:09,096 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:09,097 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:09,117 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:09,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:09,307 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:09,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:09,308 INFO L85 PathProgramCache]: Analyzing trace with hash -1251839469, now seen corresponding path program 1 times [2021-12-22 00:15:09,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:09,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389893672] [2021-12-22 00:15:09,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:09,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:09,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:09,366 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:09,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:09,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:09,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:09,399 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:09,399 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:09,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389893672] [2021-12-22 00:15:09,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389893672] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:09,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231562997] [2021-12-22 00:15:09,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:09,400 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:09,400 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:09,401 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 00:15:09,402 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-22 00:15:09,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:09,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 00:15:09,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:09,640 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:09,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:09,673 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 00:15:09,673 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 24 [2021-12-22 00:15:09,785 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:09,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231562997] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:15:09,785 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 00:15:09,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 15 [2021-12-22 00:15:09,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899987954] [2021-12-22 00:15:09,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:09,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-22 00:15:09,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:09,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-22 00:15:09,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-12-22 00:15:09,787 INFO L87 Difference]: Start difference. First operand 128 states and 139 transitions. Second operand has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-22 00:15:09,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:09,984 INFO L93 Difference]: Finished difference Result 135 states and 147 transitions. [2021-12-22 00:15:09,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 00:15:09,985 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 29 [2021-12-22 00:15:09,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:09,985 INFO L225 Difference]: With dead ends: 135 [2021-12-22 00:15:09,985 INFO L226 Difference]: Without dead ends: 135 [2021-12-22 00:15:09,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-12-22 00:15:09,986 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 33 mSDsluCounter, 1093 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 1212 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:09,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 1212 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 00:15:09,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-22 00:15:09,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 128. [2021-12-22 00:15:09,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 71 states have (on average 1.8309859154929577) internal successors, (130), 122 states have internal predecessors, (130), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:09,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2021-12-22 00:15:09,989 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 29 [2021-12-22 00:15:09,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:09,989 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2021-12-22 00:15:09,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-22 00:15:09,989 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2021-12-22 00:15:09,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-22 00:15:09,990 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:09,990 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:10,010 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:10,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-22 00:15:10,191 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:10,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:10,192 INFO L85 PathProgramCache]: Analyzing trace with hash -152317901, now seen corresponding path program 1 times [2021-12-22 00:15:10,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:10,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117702637] [2021-12-22 00:15:10,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:10,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:10,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:10,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,239 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:10,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,257 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 00:15:10,257 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:10,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117702637] [2021-12-22 00:15:10,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117702637] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:10,257 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:10,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-22 00:15:10,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058454626] [2021-12-22 00:15:10,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:10,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 00:15:10,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:10,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 00:15:10,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-22 00:15:10,258 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 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) [2021-12-22 00:15:10,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:10,477 INFO L93 Difference]: Finished difference Result 128 states and 138 transitions. [2021-12-22 00:15:10,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 00:15:10,478 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 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 30 [2021-12-22 00:15:10,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:10,478 INFO L225 Difference]: With dead ends: 128 [2021-12-22 00:15:10,478 INFO L226 Difference]: Without dead ends: 128 [2021-12-22 00:15:10,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-12-22 00:15:10,479 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 23 mSDsluCounter, 325 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:10,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 438 Invalid, 426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 00:15:10,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-12-22 00:15:10,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2021-12-22 00:15:10,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 71 states have (on average 1.8169014084507042) internal successors, (129), 121 states have internal predecessors, (129), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:10,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 137 transitions. [2021-12-22 00:15:10,482 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 137 transitions. Word has length 30 [2021-12-22 00:15:10,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:10,482 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 137 transitions. [2021-12-22 00:15:10,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 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) [2021-12-22 00:15:10,482 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 137 transitions. [2021-12-22 00:15:10,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-22 00:15:10,483 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:10,483 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:10,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-12-22 00:15:10,483 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:10,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:10,483 INFO L85 PathProgramCache]: Analyzing trace with hash -152317900, now seen corresponding path program 1 times [2021-12-22 00:15:10,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:10,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105852551] [2021-12-22 00:15:10,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:10,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:10,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,530 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:10,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:10,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,565 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:10,566 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:10,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105852551] [2021-12-22 00:15:10,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105852551] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:10,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:10,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-22 00:15:10,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753732677] [2021-12-22 00:15:10,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:10,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 00:15:10,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:10,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 00:15:10,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-22 00:15:10,567 INFO L87 Difference]: Start difference. First operand 127 states and 137 transitions. Second operand has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-12-22 00:15:10,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:10,776 INFO L93 Difference]: Finished difference Result 126 states and 136 transitions. [2021-12-22 00:15:10,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 00:15:10,777 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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 30 [2021-12-22 00:15:10,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:10,777 INFO L225 Difference]: With dead ends: 126 [2021-12-22 00:15:10,777 INFO L226 Difference]: Without dead ends: 126 [2021-12-22 00:15:10,778 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-12-22 00:15:10,778 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 20 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:10,778 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 468 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 00:15:10,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-12-22 00:15:10,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-12-22 00:15:10,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 71 states have (on average 1.8028169014084507) internal successors, (128), 120 states have internal predecessors, (128), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:10,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 136 transitions. [2021-12-22 00:15:10,780 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 136 transitions. Word has length 30 [2021-12-22 00:15:10,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:10,781 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 136 transitions. [2021-12-22 00:15:10,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-12-22 00:15:10,781 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 136 transitions. [2021-12-22 00:15:10,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-22 00:15:10,781 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:10,781 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:10,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-12-22 00:15:10,781 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:10,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:10,782 INFO L85 PathProgramCache]: Analyzing trace with hash 1115824007, now seen corresponding path program 1 times [2021-12-22 00:15:10,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:10,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301924686] [2021-12-22 00:15:10,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:10,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:10,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:10,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:10,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,847 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-22 00:15:10,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:10,857 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-22 00:15:10,857 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:10,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301924686] [2021-12-22 00:15:10,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301924686] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:10,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225886709] [2021-12-22 00:15:10,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:10,857 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:10,857 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:10,858 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 00:15:10,899 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-22 00:15:11,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:11,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 00:15:11,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:11,060 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-22 00:15:11,060 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:11,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225886709] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:11,061 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 00:15:11,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2021-12-22 00:15:11,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177503844] [2021-12-22 00:15:11,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:11,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 00:15:11,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:11,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 00:15:11,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:15:11,062 INFO L87 Difference]: Start difference. First operand 126 states and 136 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:11,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:11,073 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2021-12-22 00:15:11,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 00:15:11,074 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-12-22 00:15:11,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:11,074 INFO L225 Difference]: With dead ends: 114 [2021-12-22 00:15:11,074 INFO L226 Difference]: Without dead ends: 114 [2021-12-22 00:15:11,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:15:11,075 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 196 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:11,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 133 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 00:15:11,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-12-22 00:15:11,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2021-12-22 00:15:11,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 64 states have (on average 1.78125) internal successors, (114), 109 states have internal predecessors, (114), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:11,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 120 transitions. [2021-12-22 00:15:11,079 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 120 transitions. Word has length 41 [2021-12-22 00:15:11,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:11,079 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 120 transitions. [2021-12-22 00:15:11,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:11,080 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 120 transitions. [2021-12-22 00:15:11,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-22 00:15:11,082 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:11,083 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:11,103 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:11,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:11,303 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:11,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:11,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1638195673, now seen corresponding path program 1 times [2021-12-22 00:15:11,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 00:15:11,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545436462] [2021-12-22 00:15:11,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:11,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 00:15:11,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:11,359 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 00:15:11,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:11,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 00:15:11,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:11,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-12-22 00:15:11,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:11,443 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-22 00:15:11,443 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 00:15:11,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545436462] [2021-12-22 00:15:11,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545436462] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:11,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025760424] [2021-12-22 00:15:11,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:11,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:11,444 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:11,448 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 00:15:11,449 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-22 00:15:11,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:11,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-22 00:15:11,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:11,624 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:11,639 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:11,745 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: line 102479 column 46: unknown constant v_#valid_BEFORE_CALL_6 [2021-12-22 00:15:11,745 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-22 00:15:11,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-12-22 00:15:11,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900715644] [2021-12-22 00:15:11,746 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:11,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 00:15:11,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 00:15:11,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 00:15:11,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-12-22 00:15:11,747 INFO L87 Difference]: Start difference. First operand 114 states and 120 transitions. Second operand has 10 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:11,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-22 00:15:11,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-12-22 00:15:11,747 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:11,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 00:15:11,765 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:11,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 00:15:11,966 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@654497f6 at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:206) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:131) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.checkInternal(ChainingHoareTripleChecker.java:455) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.checkInternal(ChainingHoareTripleChecker.java:103) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:95) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:357) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.addOtherSuccessors(DeterministicInterpolantAutomaton.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:78) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:868) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:784) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-12-22 00:15:11,969 INFO L158 Benchmark]: Toolchain (without parser) took 8868.41ms. Allocated memory was 92.3MB in the beginning and 180.4MB in the end (delta: 88.1MB). Free memory was 61.0MB in the beginning and 133.3MB in the end (delta: -72.3MB). Peak memory consumption was 15.7MB. Max. memory is 16.1GB. [2021-12-22 00:15:11,970 INFO L158 Benchmark]: CDTParser took 0.15ms. Allocated memory is still 92.3MB. Free memory was 49.8MB in the beginning and 49.8MB in the end (delta: 39.6kB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-22 00:15:11,970 INFO L158 Benchmark]: CACSL2BoogieTranslator took 378.75ms. Allocated memory was 92.3MB in the beginning and 111.1MB in the end (delta: 18.9MB). Free memory was 60.6MB in the beginning and 81.0MB in the end (delta: -20.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-22 00:15:11,970 INFO L158 Benchmark]: Boogie Procedure Inliner took 55.54ms. Allocated memory is still 111.1MB. Free memory was 81.0MB in the beginning and 78.5MB in the end (delta: 2.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-22 00:15:11,970 INFO L158 Benchmark]: Boogie Preprocessor took 47.89ms. Allocated memory is still 111.1MB. Free memory was 78.5MB in the beginning and 76.8MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-22 00:15:11,970 INFO L158 Benchmark]: RCFGBuilder took 470.52ms. Allocated memory is still 111.1MB. Free memory was 76.8MB in the beginning and 55.4MB in the end (delta: 21.4MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. [2021-12-22 00:15:11,971 INFO L158 Benchmark]: TraceAbstraction took 7911.64ms. Allocated memory was 111.1MB in the beginning and 180.4MB in the end (delta: 69.2MB). Free memory was 55.0MB in the beginning and 133.3MB in the end (delta: -78.3MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-22 00:15:11,972 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15ms. Allocated memory is still 92.3MB. Free memory was 49.8MB in the beginning and 49.8MB in the end (delta: 39.6kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 378.75ms. Allocated memory was 92.3MB in the beginning and 111.1MB in the end (delta: 18.9MB). Free memory was 60.6MB in the beginning and 81.0MB in the end (delta: -20.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 55.54ms. Allocated memory is still 111.1MB. Free memory was 81.0MB in the beginning and 78.5MB in the end (delta: 2.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 47.89ms. Allocated memory is still 111.1MB. Free memory was 78.5MB in the beginning and 76.8MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 470.52ms. Allocated memory is still 111.1MB. Free memory was 76.8MB in the beginning and 55.4MB in the end (delta: 21.4MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. * TraceAbstraction took 7911.64ms. Allocated memory was 111.1MB in the beginning and 180.4MB in the end (delta: 69.2MB). Free memory was 55.0MB in the beginning and 133.3MB in the end (delta: -78.3MB). There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@654497f6 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@654497f6: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-12-22 00:15:11,987 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 1 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### 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/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 00:15:13,615 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 00:15:13,616 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 00:15:13,654 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 00:15:13,656 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 00:15:13,659 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 00:15:13,662 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 00:15:13,665 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 00:15:13,667 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 00:15:13,669 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 00:15:13,670 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 00:15:13,671 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 00:15:13,671 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 00:15:13,675 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 00:15:13,675 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 00:15:13,676 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 00:15:13,676 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 00:15:13,677 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 00:15:13,678 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 00:15:13,679 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 00:15:13,680 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 00:15:13,680 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 00:15:13,681 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 00:15:13,682 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 00:15:13,684 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 00:15:13,684 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 00:15:13,684 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 00:15:13,684 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 00:15:13,685 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 00:15:13,685 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 00:15:13,685 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 00:15:13,686 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 00:15:13,686 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 00:15:13,687 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 00:15:13,687 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 00:15:13,687 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 00:15:13,688 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 00:15:13,688 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 00:15:13,688 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 00:15:13,688 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 00:15:13,689 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 00:15:13,690 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-12-22 00:15:13,710 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 00:15:13,710 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 00:15:13,711 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 00:15:13,711 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 00:15:13,711 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 00:15:13,711 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 00:15:13,712 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 00:15:13,712 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 00:15:13,712 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 00:15:13,712 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 00:15:13,712 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 00:15:13,712 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 00:15:13,713 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 00:15:13,713 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 00:15:13,713 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 00:15:13,713 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 00:15:13,713 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 00:15:13,713 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-22 00:15:13,713 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 00:15:13,713 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 00:15:13,714 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-22 00:15:13,714 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-22 00:15:13,714 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 00:15:13,714 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 00:15:13,714 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 00:15:13,714 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 00:15:13,714 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 00:15:13,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 00:15:13,724 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 00:15:13,724 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 00:15:13,724 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-22 00:15:13,724 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-22 00:15:13,724 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 00:15:13,725 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-22 00:15:13,725 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 [2021-12-22 00:15:13,967 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 00:15:13,987 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 00:15:13,988 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 00:15:13,989 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 00:15:13,990 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 00:15:13,991 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2021-12-22 00:15:14,053 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efe4ca888/177758abfdc547ffa43185035e2236b2/FLAGabe742dfe [2021-12-22 00:15:14,487 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 00:15:14,487 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2021-12-22 00:15:14,503 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efe4ca888/177758abfdc547ffa43185035e2236b2/FLAGabe742dfe [2021-12-22 00:15:14,515 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efe4ca888/177758abfdc547ffa43185035e2236b2 [2021-12-22 00:15:14,517 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 00:15:14,518 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 00:15:14,519 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 00:15:14,519 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 00:15:14,521 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 00:15:14,521 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,522 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61ba74c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14, skipping insertion in model container [2021-12-22 00:15:14,522 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,532 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 00:15:14,561 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 00:15:14,787 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i[24640,24653] [2021-12-22 00:15:14,790 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 00:15:14,800 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 00:15:14,845 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i[24640,24653] [2021-12-22 00:15:14,845 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 00:15:14,868 INFO L208 MainTranslator]: Completed translation [2021-12-22 00:15:14,868 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14 WrapperNode [2021-12-22 00:15:14,868 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 00:15:14,869 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 00:15:14,869 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 00:15:14,869 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 00:15:14,874 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,897 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,925 INFO L137 Inliner]: procedures = 130, calls = 47, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 141 [2021-12-22 00:15:14,926 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 00:15:14,926 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 00:15:14,927 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 00:15:14,927 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 00:15:14,932 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,932 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,952 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,952 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,958 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,973 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,975 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,979 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 00:15:14,980 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 00:15:14,980 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 00:15:14,980 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 00:15:14,981 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (1/1) ... [2021-12-22 00:15:14,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 00:15:15,000 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 00:15:15,009 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 00:15:15,015 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 00:15:15,047 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-22 00:15:15,047 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-12-22 00:15:15,047 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-12-22 00:15:15,047 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-22 00:15:15,048 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 00:15:15,048 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 00:15:15,164 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 00:15:15,165 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 00:15:15,585 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 00:15:15,590 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 00:15:15,591 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-22 00:15:15,593 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 12:15:15 BoogieIcfgContainer [2021-12-22 00:15:15,593 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 00:15:15,594 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 00:15:15,594 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 00:15:15,596 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 00:15:15,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 12:15:14" (1/3) ... [2021-12-22 00:15:15,597 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fd1424e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 12:15:15, skipping insertion in model container [2021-12-22 00:15:15,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 12:15:14" (2/3) ... [2021-12-22 00:15:15,597 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fd1424e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 12:15:15, skipping insertion in model container [2021-12-22 00:15:15,598 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 12:15:15" (3/3) ... [2021-12-22 00:15:15,598 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_prepend_equal.i [2021-12-22 00:15:15,603 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 00:15:15,603 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 60 error locations. [2021-12-22 00:15:15,630 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 00:15:15,634 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 00:15:15,635 INFO L340 AbstractCegarLoop]: Starting to check reachability of 60 error locations. [2021-12-22 00:15:15,644 INFO L276 IsEmpty]: Start isEmpty. Operand has 130 states, 65 states have (on average 2.1076923076923078) internal successors, (137), 125 states have internal predecessors, (137), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:15,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-22 00:15:15,651 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:15,651 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-22 00:15:15,651 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:15,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:15,658 INFO L85 PathProgramCache]: Analyzing trace with hash 895303154, now seen corresponding path program 1 times [2021-12-22 00:15:15,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:15,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [467303611] [2021-12-22 00:15:15,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:15,666 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:15,666 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:15,668 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:15,669 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-22 00:15:15,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:15,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-22 00:15:15,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:15,811 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:15,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:15,831 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:15,832 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:15,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [467303611] [2021-12-22 00:15:15,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [467303611] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:15,832 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:15,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 00:15:15,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755341049] [2021-12-22 00:15:15,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:15,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 00:15:15,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:15,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 00:15:15,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:15,858 INFO L87 Difference]: Start difference. First operand has 130 states, 65 states have (on average 2.1076923076923078) internal successors, (137), 125 states have internal predecessors, (137), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 00:15:16,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:16,050 INFO L93 Difference]: Finished difference Result 127 states and 136 transitions. [2021-12-22 00:15:16,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 00:15:16,051 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-22 00:15:16,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:16,056 INFO L225 Difference]: With dead ends: 127 [2021-12-22 00:15:16,057 INFO L226 Difference]: Without dead ends: 124 [2021-12-22 00:15:16,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:16,060 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 10 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:16,060 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 193 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 00:15:16,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-12-22 00:15:16,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-12-22 00:15:16,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 63 states have (on average 2.0) internal successors, (126), 119 states have internal predecessors, (126), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:16,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 132 transitions. [2021-12-22 00:15:16,100 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 132 transitions. Word has length 6 [2021-12-22 00:15:16,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:16,100 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 132 transitions. [2021-12-22 00:15:16,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 00:15:16,101 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 132 transitions. [2021-12-22 00:15:16,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-12-22 00:15:16,101 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:16,101 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-12-22 00:15:16,110 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:16,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:16,308 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:16,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:16,310 INFO L85 PathProgramCache]: Analyzing trace with hash 895303155, now seen corresponding path program 1 times [2021-12-22 00:15:16,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:16,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [513198754] [2021-12-22 00:15:16,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:16,311 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:16,311 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:16,312 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:16,318 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-22 00:15:16,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:16,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 00:15:16,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:16,390 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:16,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:16,406 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:16,406 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:16,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [513198754] [2021-12-22 00:15:16,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [513198754] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:16,410 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:16,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 00:15:16,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199007814] [2021-12-22 00:15:16,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:16,412 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 00:15:16,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:16,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 00:15:16,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:16,415 INFO L87 Difference]: Start difference. First operand 124 states and 132 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 00:15:16,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:16,592 INFO L93 Difference]: Finished difference Result 121 states and 129 transitions. [2021-12-22 00:15:16,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 00:15:16,592 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-12-22 00:15:16,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:16,593 INFO L225 Difference]: With dead ends: 121 [2021-12-22 00:15:16,594 INFO L226 Difference]: Without dead ends: 121 [2021-12-22 00:15:16,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:16,594 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 5 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:16,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 195 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 00:15:16,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-12-22 00:15:16,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2021-12-22 00:15:16,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 116 states have internal predecessors, (123), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:16,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 129 transitions. [2021-12-22 00:15:16,600 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 129 transitions. Word has length 6 [2021-12-22 00:15:16,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:16,600 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 129 transitions. [2021-12-22 00:15:16,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 00:15:16,600 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 129 transitions. [2021-12-22 00:15:16,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-12-22 00:15:16,601 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:16,601 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:16,609 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:16,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:16,802 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:16,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:16,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1495162356, now seen corresponding path program 1 times [2021-12-22 00:15:16,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:16,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [236996026] [2021-12-22 00:15:16,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:16,803 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:16,803 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:16,804 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:16,805 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-22 00:15:16,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:16,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 00:15:16,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:16,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:16,934 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:16,934 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:16,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [236996026] [2021-12-22 00:15:16,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [236996026] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:16,937 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:16,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 00:15:16,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149227037] [2021-12-22 00:15:16,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:16,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 00:15:16,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:16,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 00:15:16,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:16,939 INFO L87 Difference]: Start difference. First operand 121 states and 129 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-12-22 00:15:16,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:16,953 INFO L93 Difference]: Finished difference Result 132 states and 142 transitions. [2021-12-22 00:15:16,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 00:15:16,954 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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 14 [2021-12-22 00:15:16,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:16,954 INFO L225 Difference]: With dead ends: 132 [2021-12-22 00:15:16,954 INFO L226 Difference]: Without dead ends: 132 [2021-12-22 00:15:16,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:16,955 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 10 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:16,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 251 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 00:15:16,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-12-22 00:15:16,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 122. [2021-12-22 00:15:16,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 64 states have (on average 1.9375) internal successors, (124), 117 states have internal predecessors, (124), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:16,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2021-12-22 00:15:16,966 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 14 [2021-12-22 00:15:16,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:16,966 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2021-12-22 00:15:16,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-12-22 00:15:16,967 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2021-12-22 00:15:16,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-22 00:15:16,967 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:16,967 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:16,974 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:17,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:17,168 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:17,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:17,169 INFO L85 PathProgramCache]: Analyzing trace with hash 2091192736, now seen corresponding path program 1 times [2021-12-22 00:15:17,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:17,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [140870960] [2021-12-22 00:15:17,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:17,169 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:17,169 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:17,170 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:17,171 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-22 00:15:17,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:17,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-22 00:15:17,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:17,302 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:17,358 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:17,359 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:17,359 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:17,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [140870960] [2021-12-22 00:15:17,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [140870960] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:17,359 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:17,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 00:15:17,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567964453] [2021-12-22 00:15:17,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:17,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 00:15:17,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:17,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 00:15:17,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:15:17,361 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-12-22 00:15:17,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:17,781 INFO L93 Difference]: Finished difference Result 122 states and 131 transitions. [2021-12-22 00:15:17,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 00:15:17,782 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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 24 [2021-12-22 00:15:17,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:17,783 INFO L225 Difference]: With dead ends: 122 [2021-12-22 00:15:17,784 INFO L226 Difference]: Without dead ends: 122 [2021-12-22 00:15:17,784 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:17,784 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 20 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:17,785 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 357 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 00:15:17,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-12-22 00:15:17,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-12-22 00:15:17,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 64 states have (on average 1.921875) internal successors, (123), 116 states have internal predecessors, (123), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:17,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 129 transitions. [2021-12-22 00:15:17,789 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 129 transitions. Word has length 24 [2021-12-22 00:15:17,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:17,795 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 129 transitions. [2021-12-22 00:15:17,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-12-22 00:15:17,796 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 129 transitions. [2021-12-22 00:15:17,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-22 00:15:17,796 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:17,799 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:17,821 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:18,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:18,006 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:18,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:18,007 INFO L85 PathProgramCache]: Analyzing trace with hash 2091192737, now seen corresponding path program 1 times [2021-12-22 00:15:18,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:18,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1368609086] [2021-12-22 00:15:18,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:18,007 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:18,008 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:18,009 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:18,010 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-22 00:15:18,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:18,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-22 00:15:18,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:18,117 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:18,198 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:18,198 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:18,199 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:18,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1368609086] [2021-12-22 00:15:18,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1368609086] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:18,199 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:18,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 00:15:18,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074434579] [2021-12-22 00:15:18,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:18,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 00:15:18,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:18,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 00:15:18,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:15:18,200 INFO L87 Difference]: Start difference. First operand 121 states and 129 transitions. Second operand has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-12-22 00:15:18,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:18,606 INFO L93 Difference]: Finished difference Result 121 states and 130 transitions. [2021-12-22 00:15:18,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 00:15:18,607 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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 24 [2021-12-22 00:15:18,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:18,608 INFO L225 Difference]: With dead ends: 121 [2021-12-22 00:15:18,608 INFO L226 Difference]: Without dead ends: 121 [2021-12-22 00:15:18,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:18,608 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 19 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:18,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 381 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 00:15:18,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-12-22 00:15:18,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2021-12-22 00:15:18,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 64 states have (on average 1.90625) internal successors, (122), 115 states have internal predecessors, (122), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:18,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 128 transitions. [2021-12-22 00:15:18,613 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 128 transitions. Word has length 24 [2021-12-22 00:15:18,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:18,613 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 128 transitions. [2021-12-22 00:15:18,613 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 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) [2021-12-22 00:15:18,613 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 128 transitions. [2021-12-22 00:15:18,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-22 00:15:18,614 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:18,614 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:18,627 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:18,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:18,814 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:18,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:18,815 INFO L85 PathProgramCache]: Analyzing trace with hash -408475519, now seen corresponding path program 1 times [2021-12-22 00:15:18,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:18,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [135578709] [2021-12-22 00:15:18,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:18,816 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:18,816 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:18,816 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:18,818 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-22 00:15:18,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:18,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-22 00:15:18,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:18,926 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:19,097 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 00:15:19,097 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 24 [2021-12-22 00:15:19,114 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:19,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:19,356 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:19,357 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:19,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [135578709] [2021-12-22 00:15:19,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [135578709] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:15:19,357 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:19,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-12-22 00:15:19,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757709762] [2021-12-22 00:15:19,358 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:19,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-22 00:15:19,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:19,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-22 00:15:19,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-22 00:15:19,359 INFO L87 Difference]: Start difference. First operand 120 states and 128 transitions. Second operand has 9 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:19,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:19,735 INFO L93 Difference]: Finished difference Result 135 states and 144 transitions. [2021-12-22 00:15:19,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 00:15:19,736 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-12-22 00:15:19,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:19,737 INFO L225 Difference]: With dead ends: 135 [2021-12-22 00:15:19,737 INFO L226 Difference]: Without dead ends: 135 [2021-12-22 00:15:19,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-12-22 00:15:19,739 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 7 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:19,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 403 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 279 Invalid, 0 Unknown, 81 Unchecked, 0.3s Time] [2021-12-22 00:15:19,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-22 00:15:19,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-12-22 00:15:19,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 75 states have (on average 1.8) internal successors, (135), 126 states have internal predecessors, (135), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:19,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions. [2021-12-22 00:15:19,747 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 26 [2021-12-22 00:15:19,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:19,748 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 143 transitions. [2021-12-22 00:15:19,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.625) internal successors, (29), 7 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:19,748 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions. [2021-12-22 00:15:19,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-22 00:15:19,748 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:19,748 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:19,756 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:19,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:19,951 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:19,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:19,951 INFO L85 PathProgramCache]: Analyzing trace with hash -408475518, now seen corresponding path program 1 times [2021-12-22 00:15:19,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:19,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [426565939] [2021-12-22 00:15:19,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:19,952 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:19,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:19,953 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:19,955 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-22 00:15:20,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:20,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-22 00:15:20,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:20,068 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:20,075 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:20,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:20,313 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 00:15:20,319 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 00:15:20,319 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 00:15:20,341 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:20,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:22,568 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:22,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [426565939] [2021-12-22 00:15:22,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [426565939] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:22,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [189085080] [2021-12-22 00:15:22,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:22,569 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 00:15:22,569 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 00:15:22,571 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 00:15:22,574 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-12-22 00:15:22,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:22,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-22 00:15:22,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:22,783 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:22,789 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:22,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:22,985 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 00:15:22,999 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 00:15:23,000 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 00:15:23,016 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:23,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:25,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [189085080] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:25,184 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:25,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-22 00:15:25,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395621618] [2021-12-22 00:15:25,184 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:25,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-22 00:15:25,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:25,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-22 00:15:25,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=86, Unknown=1, NotChecked=0, Total=110 [2021-12-22 00:15:25,185 INFO L87 Difference]: Start difference. First operand 133 states and 143 transitions. Second operand has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 00:15:25,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:25,786 INFO L93 Difference]: Finished difference Result 135 states and 144 transitions. [2021-12-22 00:15:25,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 00:15:25,786 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-12-22 00:15:25,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:25,787 INFO L225 Difference]: With dead ends: 135 [2021-12-22 00:15:25,787 INFO L226 Difference]: Without dead ends: 135 [2021-12-22 00:15:25,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=31, Invalid=124, Unknown=1, NotChecked=0, Total=156 [2021-12-22 00:15:25,787 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 3 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:25,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 405 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 383 Invalid, 0 Unknown, 78 Unchecked, 0.5s Time] [2021-12-22 00:15:25,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-22 00:15:25,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-12-22 00:15:25,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 75 states have (on average 1.7866666666666666) internal successors, (134), 126 states have internal predecessors, (134), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:25,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 142 transitions. [2021-12-22 00:15:25,794 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 142 transitions. Word has length 26 [2021-12-22 00:15:25,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:25,794 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 142 transitions. [2021-12-22 00:15:25,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 00:15:25,794 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 142 transitions. [2021-12-22 00:15:25,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-22 00:15:25,795 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:25,795 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:25,800 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:26,005 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-12-22 00:15:26,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:26,198 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:26,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:26,199 INFO L85 PathProgramCache]: Analyzing trace with hash -1702795689, now seen corresponding path program 1 times [2021-12-22 00:15:26,199 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:26,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [686248393] [2021-12-22 00:15:26,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:26,199 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:26,199 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:26,200 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:26,201 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-22 00:15:26,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:26,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 00:15:26,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:26,348 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:26,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:26,418 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:26,418 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:26,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [686248393] [2021-12-22 00:15:26,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [686248393] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:15:26,419 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:26,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-22 00:15:26,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121096712] [2021-12-22 00:15:26,419 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:26,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 00:15:26,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:26,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 00:15:26,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:15:26,420 INFO L87 Difference]: Start difference. First operand 133 states and 142 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 00:15:26,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:26,533 INFO L93 Difference]: Finished difference Result 134 states and 142 transitions. [2021-12-22 00:15:26,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 00:15:26,536 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-12-22 00:15:26,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:26,537 INFO L225 Difference]: With dead ends: 134 [2021-12-22 00:15:26,537 INFO L226 Difference]: Without dead ends: 134 [2021-12-22 00:15:26,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:26,538 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 4 mSDsluCounter, 460 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:26,538 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 579 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 00:15:26,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-12-22 00:15:26,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-12-22 00:15:26,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 75 states have (on average 1.7733333333333334) internal successors, (133), 126 states have internal predecessors, (133), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:26,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2021-12-22 00:15:26,541 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 28 [2021-12-22 00:15:26,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:26,542 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2021-12-22 00:15:26,542 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 00:15:26,542 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2021-12-22 00:15:26,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 00:15:26,542 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:26,543 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:26,550 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:26,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:26,750 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:26,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:26,750 INFO L85 PathProgramCache]: Analyzing trace with hash -1251839470, now seen corresponding path program 1 times [2021-12-22 00:15:26,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:26,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1656594006] [2021-12-22 00:15:26,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:26,751 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:26,751 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:26,752 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:26,755 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-22 00:15:26,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:26,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-22 00:15:26,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:26,894 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-22 00:15:26,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:26,908 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-22 00:15:26,909 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 11 [2021-12-22 00:15:26,946 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-22 00:15:26,946 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:26,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1656594006] [2021-12-22 00:15:26,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1656594006] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:15:26,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:26,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-12-22 00:15:26,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556141192] [2021-12-22 00:15:26,947 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:26,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 00:15:26,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:26,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 00:15:26,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 00:15:26,953 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand has 4 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 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) [2021-12-22 00:15:27,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:27,133 INFO L93 Difference]: Finished difference Result 138 states and 148 transitions. [2021-12-22 00:15:27,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 00:15:27,134 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 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) Word has length 29 [2021-12-22 00:15:27,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:27,135 INFO L225 Difference]: With dead ends: 138 [2021-12-22 00:15:27,135 INFO L226 Difference]: Without dead ends: 138 [2021-12-22 00:15:27,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-22 00:15:27,135 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 9 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:27,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 297 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 00:15:27,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-12-22 00:15:27,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2021-12-22 00:15:27,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 78 states have (on average 1.7692307692307692) internal successors, (138), 129 states have internal predecessors, (138), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:27,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 146 transitions. [2021-12-22 00:15:27,144 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 146 transitions. Word has length 29 [2021-12-22 00:15:27,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:27,144 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 146 transitions. [2021-12-22 00:15:27,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 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) [2021-12-22 00:15:27,144 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 146 transitions. [2021-12-22 00:15:27,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 00:15:27,145 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:27,145 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:27,152 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:27,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:27,349 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:27,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:27,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1251839469, now seen corresponding path program 1 times [2021-12-22 00:15:27,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:27,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [877221140] [2021-12-22 00:15:27,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:27,352 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:27,352 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:27,353 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:27,354 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-22 00:15:27,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:27,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-22 00:15:27,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:27,594 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:27,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:27,665 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 00:15:27,665 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 26 [2021-12-22 00:15:28,053 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:28,053 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:28,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [877221140] [2021-12-22 00:15:28,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [877221140] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:15:28,053 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:28,053 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2021-12-22 00:15:28,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472657086] [2021-12-22 00:15:28,054 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:28,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 00:15:28,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:28,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 00:15:28,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-12-22 00:15:28,054 INFO L87 Difference]: Start difference. First operand 136 states and 146 transitions. Second operand has 12 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-22 00:15:28,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:28,791 INFO L93 Difference]: Finished difference Result 143 states and 154 transitions. [2021-12-22 00:15:28,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 00:15:28,791 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 29 [2021-12-22 00:15:28,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:28,792 INFO L225 Difference]: With dead ends: 143 [2021-12-22 00:15:28,792 INFO L226 Difference]: Without dead ends: 143 [2021-12-22 00:15:28,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-12-22 00:15:28,793 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 17 mSDsluCounter, 939 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 1059 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:28,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 1059 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-22 00:15:28,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-12-22 00:15:28,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 136. [2021-12-22 00:15:28,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 78 states have (on average 1.7564102564102564) internal successors, (137), 129 states have internal predecessors, (137), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:28,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 145 transitions. [2021-12-22 00:15:28,796 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 145 transitions. Word has length 29 [2021-12-22 00:15:28,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:28,796 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 145 transitions. [2021-12-22 00:15:28,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-22 00:15:28,796 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 145 transitions. [2021-12-22 00:15:28,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-22 00:15:28,797 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:28,797 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:28,817 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:28,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:28,997 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:28,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:28,998 INFO L85 PathProgramCache]: Analyzing trace with hash -152317901, now seen corresponding path program 1 times [2021-12-22 00:15:28,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:28,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1729759802] [2021-12-22 00:15:28,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:28,998 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:28,998 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:28,999 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:29,000 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-22 00:15:29,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:29,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 00:15:29,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:29,139 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:29,191 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:29,191 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:29,191 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:29,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1729759802] [2021-12-22 00:15:29,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1729759802] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:29,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:29,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 00:15:29,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949463933] [2021-12-22 00:15:29,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:29,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 00:15:29,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:29,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 00:15:29,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:29,193 INFO L87 Difference]: Start difference. First operand 136 states and 145 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-12-22 00:15:29,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:29,644 INFO L93 Difference]: Finished difference Result 136 states and 145 transitions. [2021-12-22 00:15:29,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 00:15:29,644 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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 30 [2021-12-22 00:15:29,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:29,645 INFO L225 Difference]: With dead ends: 136 [2021-12-22 00:15:29,645 INFO L226 Difference]: Without dead ends: 136 [2021-12-22 00:15:29,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-22 00:15:29,646 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 22 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:29,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 402 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 00:15:29,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-12-22 00:15:29,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2021-12-22 00:15:29,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 78 states have (on average 1.7435897435897436) internal successors, (136), 128 states have internal predecessors, (136), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:29,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 144 transitions. [2021-12-22 00:15:29,649 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 144 transitions. Word has length 30 [2021-12-22 00:15:29,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:29,649 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 144 transitions. [2021-12-22 00:15:29,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-12-22 00:15:29,649 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 144 transitions. [2021-12-22 00:15:29,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-22 00:15:29,650 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:29,650 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:29,659 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:29,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:29,855 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:29,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:29,856 INFO L85 PathProgramCache]: Analyzing trace with hash -152317900, now seen corresponding path program 1 times [2021-12-22 00:15:29,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:29,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [354170063] [2021-12-22 00:15:29,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:29,857 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:29,857 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:29,858 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:29,858 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-22 00:15:29,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:29,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-22 00:15:29,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:29,988 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:30,091 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:30,091 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:30,091 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:30,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [354170063] [2021-12-22 00:15:30,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [354170063] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:30,091 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:30,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 00:15:30,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875506690] [2021-12-22 00:15:30,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:30,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 00:15:30,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:30,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 00:15:30,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:30,092 INFO L87 Difference]: Start difference. First operand 135 states and 144 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-12-22 00:15:30,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:30,622 INFO L93 Difference]: Finished difference Result 134 states and 143 transitions. [2021-12-22 00:15:30,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 00:15:30,622 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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 30 [2021-12-22 00:15:30,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:30,623 INFO L225 Difference]: With dead ends: 134 [2021-12-22 00:15:30,623 INFO L226 Difference]: Without dead ends: 134 [2021-12-22 00:15:30,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-22 00:15:30,624 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 20 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:30,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 432 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 00:15:30,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-12-22 00:15:30,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-12-22 00:15:30,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 78 states have (on average 1.7307692307692308) internal successors, (135), 127 states have internal predecessors, (135), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-22 00:15:30,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 143 transitions. [2021-12-22 00:15:30,627 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 143 transitions. Word has length 30 [2021-12-22 00:15:30,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:30,627 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 143 transitions. [2021-12-22 00:15:30,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-12-22 00:15:30,627 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 143 transitions. [2021-12-22 00:15:30,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-22 00:15:30,627 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:30,627 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:30,639 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:30,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:30,836 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:30,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:30,836 INFO L85 PathProgramCache]: Analyzing trace with hash 1115824007, now seen corresponding path program 1 times [2021-12-22 00:15:30,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:30,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1738399682] [2021-12-22 00:15:30,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:30,837 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:30,837 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:30,838 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:30,838 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-22 00:15:30,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:30,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 00:15:30,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:31,031 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-22 00:15:31,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:31,106 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-22 00:15:31,106 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:31,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1738399682] [2021-12-22 00:15:31,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1738399682] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 00:15:31,106 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:31,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-12-22 00:15:31,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248204448] [2021-12-22 00:15:31,106 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:31,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 00:15:31,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:31,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 00:15:31,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:15:31,107 INFO L87 Difference]: Start difference. First operand 134 states and 143 transitions. Second operand has 6 states, 6 states have (on average 6.166666666666667) internal successors, (37), 6 states have internal predecessors, (37), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-22 00:15:31,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:31,124 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2021-12-22 00:15:31,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 00:15:31,124 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.166666666666667) internal successors, (37), 6 states have internal predecessors, (37), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 41 [2021-12-22 00:15:31,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:31,125 INFO L225 Difference]: With dead ends: 122 [2021-12-22 00:15:31,125 INFO L226 Difference]: Without dead ends: 122 [2021-12-22 00:15:31,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:15:31,125 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 98 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:31,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 268 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 00:15:31,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-12-22 00:15:31,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2021-12-22 00:15:31,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 71 states have (on average 1.704225352112676) internal successors, (121), 116 states have internal predecessors, (121), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:31,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 127 transitions. [2021-12-22 00:15:31,128 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 127 transitions. Word has length 41 [2021-12-22 00:15:31,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:31,128 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 127 transitions. [2021-12-22 00:15:31,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.166666666666667) internal successors, (37), 6 states have internal predecessors, (37), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-22 00:15:31,128 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 127 transitions. [2021-12-22 00:15:31,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-22 00:15:31,129 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:31,129 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:31,140 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:31,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:31,329 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:31,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:31,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1638195673, now seen corresponding path program 1 times [2021-12-22 00:15:31,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:31,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [263245238] [2021-12-22 00:15:31,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:31,330 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:31,330 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:31,331 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:31,332 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-22 00:15:31,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:31,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-22 00:15:31,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:31,562 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:31,587 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:31,713 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 00:15:31,714 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 24 [2021-12-22 00:15:31,738 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:31,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:31,842 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 00:15:32,037 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 00:15:32,038 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2021-12-22 00:15:32,069 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:15:32,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:32,304 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:32,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [263245238] [2021-12-22 00:15:32,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [263245238] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:32,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2108744053] [2021-12-22 00:15:32,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:32,305 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 00:15:32,305 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 00:15:32,306 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 00:15:32,307 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-12-22 00:15:32,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:32,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-22 00:15:32,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:32,594 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 00:15:32,597 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2021-12-22 00:15:32,633 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 00:15:32,633 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 9 [2021-12-22 00:15:32,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:32,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:32,747 INFO L353 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2021-12-22 00:15:32,748 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 31 [2021-12-22 00:15:32,834 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 00:15:32,834 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 18 [2021-12-22 00:15:33,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:33,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:33,033 INFO L353 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2021-12-22 00:15:33,033 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 40 [2021-12-22 00:15:33,556 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-22 00:15:33,556 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 18 [2021-12-22 00:15:33,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:33,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:33,676 INFO L353 Elim1Store]: treesize reduction 8, result has 60.0 percent of original size [2021-12-22 00:15:33,677 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 40 [2021-12-22 00:15:33,842 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-22 00:15:33,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:33,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2108744053] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:33,914 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:33,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 19 [2021-12-22 00:15:33,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788920956] [2021-12-22 00:15:33,915 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:33,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-22 00:15:33,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:33,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-22 00:15:33,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2021-12-22 00:15:33,916 INFO L87 Difference]: Start difference. First operand 122 states and 127 transitions. Second operand has 20 states, 17 states have (on average 3.588235294117647) internal successors, (61), 16 states have internal predecessors, (61), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-22 00:15:46,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:46,525 INFO L93 Difference]: Finished difference Result 129 states and 133 transitions. [2021-12-22 00:15:46,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-22 00:15:46,525 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.588235294117647) internal successors, (61), 16 states have internal predecessors, (61), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 43 [2021-12-22 00:15:46,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:46,526 INFO L225 Difference]: With dead ends: 129 [2021-12-22 00:15:46,526 INFO L226 Difference]: Without dead ends: 129 [2021-12-22 00:15:46,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 79 SyntacticMatches, 7 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2021-12-22 00:15:46,527 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 12 mSDsluCounter, 718 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 821 SdHoareTripleChecker+Invalid, 790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 514 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:46,527 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 821 Invalid, 790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 270 Invalid, 0 Unknown, 514 Unchecked, 0.4s Time] [2021-12-22 00:15:46,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-12-22 00:15:46,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-12-22 00:15:46,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 78 states have (on average 1.6282051282051282) internal successors, (127), 122 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:46,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 133 transitions. [2021-12-22 00:15:46,529 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 133 transitions. Word has length 43 [2021-12-22 00:15:46,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:46,530 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 133 transitions. [2021-12-22 00:15:46,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.588235294117647) internal successors, (61), 16 states have internal predecessors, (61), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-22 00:15:46,530 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 133 transitions. [2021-12-22 00:15:46,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-22 00:15:46,530 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:46,531 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:46,547 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-12-22 00:15:46,740 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:46,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:46,931 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:46,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:46,932 INFO L85 PathProgramCache]: Analyzing trace with hash -1638195672, now seen corresponding path program 1 times [2021-12-22 00:15:46,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:46,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2125990666] [2021-12-22 00:15:46,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:46,932 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:46,932 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:46,933 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:46,934 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-12-22 00:15:47,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:47,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-22 00:15:47,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:47,166 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:47,170 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:47,188 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:47,192 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:49,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:49,325 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 00:15:49,334 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 00:15:49,334 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 00:15:49,374 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:51,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:51,505 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 00:15:51,812 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-22 00:15:51,812 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-12-22 00:15:51,897 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 00:15:51,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:52,192 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:52,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2125990666] [2021-12-22 00:15:52,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2125990666] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:52,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1029146106] [2021-12-22 00:15:52,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:52,193 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 00:15:52,193 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 00:15:52,194 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 00:15:52,194 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-12-22 00:15:52,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:52,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-22 00:15:52,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:52,498 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:15:52,505 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:52,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:52,640 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 00:15:52,720 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:54,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:54,957 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 00:15:55,223 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-22 00:15:55,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:15:55,340 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 00:15:55,361 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-22 00:15:55,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:15:55,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1029146106] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:15:55,526 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:15:55,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2021-12-22 00:15:55,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270873704] [2021-12-22 00:15:55,526 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:15:55,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-22 00:15:55,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:55,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-22 00:15:55,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=434, Unknown=3, NotChecked=0, Total=506 [2021-12-22 00:15:55,528 INFO L87 Difference]: Start difference. First operand 129 states and 133 transitions. Second operand has 20 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 15 states have internal predecessors, (60), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-22 00:15:58,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:58,442 INFO L93 Difference]: Finished difference Result 128 states and 132 transitions. [2021-12-22 00:15:58,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-22 00:15:58,442 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 15 states have internal predecessors, (60), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 43 [2021-12-22 00:15:58,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:58,443 INFO L225 Difference]: With dead ends: 128 [2021-12-22 00:15:58,443 INFO L226 Difference]: Without dead ends: 128 [2021-12-22 00:15:58,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 67 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=112, Invalid=696, Unknown=4, NotChecked=0, Total=812 [2021-12-22 00:15:58,444 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 12 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 712 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 321 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:58,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 712 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 292 Invalid, 0 Unknown, 321 Unchecked, 0.5s Time] [2021-12-22 00:15:58,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-12-22 00:15:58,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2021-12-22 00:15:58,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 78 states have (on average 1.6153846153846154) internal successors, (126), 121 states have internal predecessors, (126), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:58,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 132 transitions. [2021-12-22 00:15:58,446 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 132 transitions. Word has length 43 [2021-12-22 00:15:58,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:58,447 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 132 transitions. [2021-12-22 00:15:58,447 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 15 states have internal predecessors, (60), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-22 00:15:58,447 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 132 transitions. [2021-12-22 00:15:58,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-22 00:15:58,447 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:58,447 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:58,455 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:58,661 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-12-22 00:15:58,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:58,852 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:58,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:58,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1946956456, now seen corresponding path program 1 times [2021-12-22 00:15:58,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:58,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2096676404] [2021-12-22 00:15:58,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:58,852 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:58,852 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:58,853 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:58,856 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-12-22 00:15:59,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:59,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-22 00:15:59,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:59,071 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-22 00:15:59,072 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:59,072 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:59,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2096676404] [2021-12-22 00:15:59,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2096676404] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:59,072 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:59,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 00:15:59,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239725302] [2021-12-22 00:15:59,072 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:59,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 00:15:59,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:59,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 00:15:59,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:59,073 INFO L87 Difference]: Start difference. First operand 128 states and 132 transitions. Second operand has 3 states, 2 states have (on average 12.5) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-22 00:15:59,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:59,221 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2021-12-22 00:15:59,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 00:15:59,221 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 12.5) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 45 [2021-12-22 00:15:59,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:59,222 INFO L225 Difference]: With dead ends: 142 [2021-12-22 00:15:59,222 INFO L226 Difference]: Without dead ends: 142 [2021-12-22 00:15:59,222 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 00:15:59,223 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 80 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:59,223 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 102 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 00:15:59,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-12-22 00:15:59,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 124. [2021-12-22 00:15:59,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 78 states have (on average 1.564102564102564) internal successors, (122), 117 states have internal predecessors, (122), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:59,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 128 transitions. [2021-12-22 00:15:59,225 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 128 transitions. Word has length 45 [2021-12-22 00:15:59,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:59,226 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 128 transitions. [2021-12-22 00:15:59,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 12.5) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-22 00:15:59,226 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 128 transitions. [2021-12-22 00:15:59,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-22 00:15:59,226 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:59,226 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:59,237 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-12-22 00:15:59,435 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:15:59,435 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:15:59,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:15:59,435 INFO L85 PathProgramCache]: Analyzing trace with hash 1946956457, now seen corresponding path program 1 times [2021-12-22 00:15:59,436 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:15:59,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1435564281] [2021-12-22 00:15:59,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:15:59,436 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:15:59,436 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:15:59,437 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:15:59,438 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-22 00:15:59,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:15:59,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 00:15:59,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:15:59,675 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-22 00:15:59,675 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:15:59,675 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:15:59,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1435564281] [2021-12-22 00:15:59,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1435564281] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:15:59,675 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:15:59,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 00:15:59,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440254625] [2021-12-22 00:15:59,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:15:59,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 00:15:59,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:15:59,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 00:15:59,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-22 00:15:59,676 INFO L87 Difference]: Start difference. First operand 124 states and 128 transitions. Second operand has 5 states, 4 states have (on average 6.25) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:59,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:15:59,826 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2021-12-22 00:15:59,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 00:15:59,826 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.25) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-12-22 00:15:59,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:15:59,827 INFO L225 Difference]: With dead ends: 120 [2021-12-22 00:15:59,827 INFO L226 Difference]: Without dead ends: 120 [2021-12-22 00:15:59,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:15:59,828 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 244 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 00:15:59,828 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [244 Valid, 114 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 00:15:59,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-12-22 00:15:59,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-12-22 00:15:59,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 78 states have (on average 1.5128205128205128) internal successors, (118), 113 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:15:59,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 124 transitions. [2021-12-22 00:15:59,831 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 124 transitions. Word has length 45 [2021-12-22 00:15:59,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:15:59,831 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 124 transitions. [2021-12-22 00:15:59,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.25) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 00:15:59,832 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 124 transitions. [2021-12-22 00:15:59,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-22 00:15:59,832 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:15:59,832 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:15:59,846 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-12-22 00:16:00,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:16:00,046 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:16:00,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:16:00,047 INFO L85 PathProgramCache]: Analyzing trace with hash 226108014, now seen corresponding path program 1 times [2021-12-22 00:16:00,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:16:00,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [198865453] [2021-12-22 00:16:00,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:16:00,047 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:16:00,047 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:16:00,048 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:16:00,050 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-12-22 00:16:00,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:16:00,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-22 00:16:00,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:16:00,268 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:00,311 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-22 00:16:00,311 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:16:00,312 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:16:00,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [198865453] [2021-12-22 00:16:00,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [198865453] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:16:00,312 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:16:00,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 00:16:00,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588364540] [2021-12-22 00:16:00,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:16:00,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 00:16:00,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:16:00,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 00:16:00,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:16:00,313 INFO L87 Difference]: Start difference. First operand 120 states and 124 transitions. Second operand has 6 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-22 00:16:00,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:16:00,719 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2021-12-22 00:16:00,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 00:16:00,724 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 46 [2021-12-22 00:16:00,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:16:00,724 INFO L225 Difference]: With dead ends: 134 [2021-12-22 00:16:00,724 INFO L226 Difference]: Without dead ends: 134 [2021-12-22 00:16:00,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:16:00,725 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 73 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 00:16:00,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 235 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 00:16:00,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-12-22 00:16:00,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 116. [2021-12-22 00:16:00,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 78 states have (on average 1.4615384615384615) internal successors, (114), 109 states have internal predecessors, (114), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:16:00,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 120 transitions. [2021-12-22 00:16:00,729 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 120 transitions. Word has length 46 [2021-12-22 00:16:00,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:16:00,729 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 120 transitions. [2021-12-22 00:16:00,729 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-22 00:16:00,729 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 120 transitions. [2021-12-22 00:16:00,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-22 00:16:00,729 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:16:00,730 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:16:00,738 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Ended with exit code 0 [2021-12-22 00:16:00,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:16:00,938 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:16:00,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:16:00,939 INFO L85 PathProgramCache]: Analyzing trace with hash 226108015, now seen corresponding path program 1 times [2021-12-22 00:16:00,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:16:00,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [703836758] [2021-12-22 00:16:00,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:16:00,939 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:16:00,939 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:16:00,940 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:16:00,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-12-22 00:16:01,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:16:01,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-22 00:16:01,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:16:01,144 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:01,211 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-22 00:16:01,212 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 00:16:01,212 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:16:01,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [703836758] [2021-12-22 00:16:01,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [703836758] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 00:16:01,212 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 00:16:01,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 00:16:01,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599031973] [2021-12-22 00:16:01,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 00:16:01,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 00:16:01,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:16:01,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 00:16:01,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 00:16:01,213 INFO L87 Difference]: Start difference. First operand 116 states and 120 transitions. Second operand has 6 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-22 00:16:01,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:16:01,553 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2021-12-22 00:16:01,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 00:16:01,554 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 46 [2021-12-22 00:16:01,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:16:01,554 INFO L225 Difference]: With dead ends: 112 [2021-12-22 00:16:01,554 INFO L226 Difference]: Without dead ends: 112 [2021-12-22 00:16:01,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-22 00:16:01,555 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 73 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 00:16:01,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 246 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 00:16:01,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-12-22 00:16:01,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2021-12-22 00:16:01,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 78 states have (on average 1.4102564102564104) internal successors, (110), 105 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:16:01,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 116 transitions. [2021-12-22 00:16:01,558 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 116 transitions. Word has length 46 [2021-12-22 00:16:01,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:16:01,559 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 116 transitions. [2021-12-22 00:16:01,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-12-22 00:16:01,559 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 116 transitions. [2021-12-22 00:16:01,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-22 00:16:01,559 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:16:01,559 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:16:01,570 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-12-22 00:16:01,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:16:01,767 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:16:01,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:16:01,767 INFO L85 PathProgramCache]: Analyzing trace with hash 226118937, now seen corresponding path program 1 times [2021-12-22 00:16:01,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:16:01,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1275570372] [2021-12-22 00:16:01,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:16:01,768 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:16:01,768 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:16:01,769 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:16:01,770 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-12-22 00:16:02,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:16:02,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-22 00:16:02,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:16:02,159 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:02,375 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2021-12-22 00:16:02,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:16:02,638 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2021-12-22 00:16:02,657 INFO L353 Elim1Store]: treesize reduction 27, result has 43.8 percent of original size [2021-12-22 00:16:02,658 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 35 [2021-12-22 00:16:02,801 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2021-12-22 00:16:02,850 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:16:02,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:16:02,974 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:16:02,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1275570372] [2021-12-22 00:16:02,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1275570372] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:16:02,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1328567313] [2021-12-22 00:16:02,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:16:02,977 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 00:16:02,978 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 00:16:02,978 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 00:16:02,979 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-12-22 00:16:03,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:16:03,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-22 00:16:03,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:16:03,452 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:03,792 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2021-12-22 00:16:04,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:16:04,053 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 21 [2021-12-22 00:16:04,072 INFO L353 Elim1Store]: treesize reduction 27, result has 43.8 percent of original size [2021-12-22 00:16:04,072 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 35 [2021-12-22 00:16:04,220 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2021-12-22 00:16:04,259 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:16:04,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:16:04,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1328567313] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:16:04,376 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 00:16:04,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 29 [2021-12-22 00:16:04,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507406382] [2021-12-22 00:16:04,376 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 00:16:04,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-22 00:16:04,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 00:16:04,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-22 00:16:04,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=860, Unknown=3, NotChecked=0, Total=992 [2021-12-22 00:16:04,378 INFO L87 Difference]: Start difference. First operand 112 states and 116 transitions. Second operand has 30 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 states have internal predecessors, (74), 4 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-22 00:16:05,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 00:16:05,374 INFO L93 Difference]: Finished difference Result 127 states and 131 transitions. [2021-12-22 00:16:05,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-22 00:16:05,375 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 states have internal predecessors, (74), 4 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2021-12-22 00:16:05,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 00:16:05,376 INFO L225 Difference]: With dead ends: 127 [2021-12-22 00:16:05,376 INFO L226 Difference]: Without dead ends: 127 [2021-12-22 00:16:05,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 68 SyntacticMatches, 8 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=240, Invalid=1474, Unknown=8, NotChecked=0, Total=1722 [2021-12-22 00:16:05,377 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 62 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 707 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 167 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-22 00:16:05,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 707 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 386 Invalid, 0 Unknown, 167 Unchecked, 0.6s Time] [2021-12-22 00:16:05,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-12-22 00:16:05,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 111. [2021-12-22 00:16:05,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 78 states have (on average 1.3974358974358974) internal successors, (109), 104 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-22 00:16:05,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 115 transitions. [2021-12-22 00:16:05,379 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 115 transitions. Word has length 46 [2021-12-22 00:16:05,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 00:16:05,380 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 115 transitions. [2021-12-22 00:16:05,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.740740740740741) internal successors, (74), 26 states have internal predecessors, (74), 4 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-12-22 00:16:05,380 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 115 transitions. [2021-12-22 00:16:05,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-22 00:16:05,380 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 00:16:05,381 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 00:16:05,391 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-12-22 00:16:05,594 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-12-22 00:16:05,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 00:16:05,785 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 56 more)] === [2021-12-22 00:16:05,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 00:16:05,785 INFO L85 PathProgramCache]: Analyzing trace with hash 226118938, now seen corresponding path program 1 times [2021-12-22 00:16:05,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 00:16:05,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1681619244] [2021-12-22 00:16:05,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:16:05,786 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 00:16:05,786 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 00:16:05,786 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 00:16:05,787 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-12-22 00:16:06,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:16:06,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 49 conjunts are in the unsatisfiable core [2021-12-22 00:16:06,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:16:06,266 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:06,271 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:06,606 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:06,616 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:06,774 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 14 [2021-12-22 00:16:06,781 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-22 00:16:07,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:16:07,237 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 28 [2021-12-22 00:16:07,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:16:07,246 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-22 00:16:07,261 INFO L353 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-22 00:16:07,261 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-22 00:16:07,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:16:07,275 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 00:16:07,473 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-12-22 00:16:07,480 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 00:16:07,537 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:16:07,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 00:16:09,976 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 00:16:09,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1681619244] [2021-12-22 00:16:09,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1681619244] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 00:16:09,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1393521908] [2021-12-22 00:16:09,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 00:16:09,976 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 00:16:09,977 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 00:16:09,977 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 00:16:09,978 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-12-22 00:16:10,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 00:16:10,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-22 00:16:10,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 00:16:10,564 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:10,570 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 00:16:11,177 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 14 [2021-12-22 00:16:11,184 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-22 00:16:11,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:16:11,594 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-22 00:16:11,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:16:11,605 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 28 [2021-12-22 00:16:11,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 00:16:11,617 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 00:16:11,631 INFO L353 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-22 00:16:11,631 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-22 00:16:11,850 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-12-22 00:16:11,855 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 00:16:11,875 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 00:16:11,876 INFO L328 TraceCheckSpWp]: Computing backward predicates...