./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version ff03de63 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/list-simple/sll2n_prepend_unequal.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 277634da297b7f9e262585608ed7ad62cca7d59b0122d4e61ee1b4b78256acae --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 18:17:57,291 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 18:17:57,293 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 18:17:57,330 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 18:17:57,331 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 18:17:57,332 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 18:17:57,333 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 18:17:57,334 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 18:17:57,336 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 18:17:57,336 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 18:17:57,337 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 18:17:57,338 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 18:17:57,339 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 18:17:57,339 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 18:17:57,340 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 18:17:57,341 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 18:17:57,342 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 18:17:57,343 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 18:17:57,344 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 18:17:57,346 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 18:17:57,347 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 18:17:57,348 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 18:17:57,349 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 18:17:57,350 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 18:17:57,352 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 18:17:57,353 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 18:17:57,353 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 18:17:57,354 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 18:17:57,354 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 18:17:57,355 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 18:17:57,355 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 18:17:57,356 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 18:17:57,357 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 18:17:57,357 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 18:17:57,358 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 18:17:57,358 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 18:17:57,359 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 18:17:57,359 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 18:17:57,360 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 18:17:57,360 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 18:17:57,361 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 18:17:57,362 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-21 18:17:57,379 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 18:17:57,380 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 18:17:57,380 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 18:17:57,381 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 18:17:57,381 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 18:17:57,381 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 18:17:57,382 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 18:17:57,382 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 18:17:57,382 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 18:17:57,383 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 18:17:57,383 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 18:17:57,383 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-21 18:17:57,383 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 18:17:57,383 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 18:17:57,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 18:17:57,384 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-21 18:17:57,384 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-21 18:17:57,384 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-21 18:17:57,384 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 18:17:57,385 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-21 18:17:57,385 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 18:17:57,385 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 18:17:57,385 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 18:17:57,385 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 18:17:57,385 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 18:17:57,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 18:17:57,386 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 18:17:57,386 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 18:17:57,386 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 18:17:57,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 18:17:57,386 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 18:17:57,387 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 277634da297b7f9e262585608ed7ad62cca7d59b0122d4e61ee1b4b78256acae [2021-12-21 18:17:57,593 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 18:17:57,622 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 18:17:57,624 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 18:17:57,625 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 18:17:57,627 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 18:17:57,629 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i [2021-12-21 18:17:57,705 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad6910d98/4c85c1a17a5e4143a07403e01c997e75/FLAG45022c9e1 [2021-12-21 18:17:58,141 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 18:17:58,146 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i [2021-12-21 18:17:58,164 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad6910d98/4c85c1a17a5e4143a07403e01c997e75/FLAG45022c9e1 [2021-12-21 18:17:58,523 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad6910d98/4c85c1a17a5e4143a07403e01c997e75 [2021-12-21 18:17:58,525 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 18:17:58,527 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 18:17:58,528 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 18:17:58,528 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 18:17:58,531 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 18:17:58,532 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:58,534 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@614ebe38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58, skipping insertion in model container [2021-12-21 18:17:58,535 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:58,541 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 18:17:58,587 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 18:17:58,821 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/sll2n_prepend_unequal.i[24165,24178] [2021-12-21 18:17:58,823 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 18:17:58,834 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 18:17:58,896 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/sll2n_prepend_unequal.i[24165,24178] [2021-12-21 18:17:58,906 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 18:17:58,930 INFO L208 MainTranslator]: Completed translation [2021-12-21 18:17:58,931 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58 WrapperNode [2021-12-21 18:17:58,931 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 18:17:58,932 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 18:17:58,932 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 18:17:58,932 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 18:17:58,938 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:58,967 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:58,990 INFO L137 Inliner]: procedures = 127, calls = 32, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 115 [2021-12-21 18:17:58,991 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 18:17:58,991 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 18:17:58,992 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 18:17:58,992 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 18:17:58,999 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:58,999 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:59,009 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:59,010 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:59,019 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:59,022 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:59,024 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:59,026 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 18:17:59,026 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 18:17:59,026 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 18:17:59,026 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 18:17:59,027 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (1/1) ... [2021-12-21 18:17:59,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 18:17:59,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:17:59,060 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 18:17:59,062 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 18:17:59,096 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-21 18:17:59,096 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-21 18:17:59,096 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-12-21 18:17:59,096 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-12-21 18:17:59,096 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-21 18:17:59,096 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 18:17:59,096 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-21 18:17:59,097 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-21 18:17:59,097 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-21 18:17:59,097 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-21 18:17:59,097 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-21 18:17:59,097 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 18:17:59,097 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 18:17:59,097 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 18:17:59,205 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 18:17:59,207 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 18:17:59,450 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 18:17:59,456 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 18:17:59,458 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-21 18:17:59,460 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 06:17:59 BoogieIcfgContainer [2021-12-21 18:17:59,460 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 18:17:59,462 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 18:17:59,463 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 18:17:59,469 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 18:17:59,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 06:17:58" (1/3) ... [2021-12-21 18:17:59,469 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ba711ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 06:17:59, skipping insertion in model container [2021-12-21 18:17:59,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:17:58" (2/3) ... [2021-12-21 18:17:59,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ba711ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 06:17:59, skipping insertion in model container [2021-12-21 18:17:59,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 06:17:59" (3/3) ... [2021-12-21 18:17:59,471 INFO L111 eAbstractionObserver]: Analyzing ICFG sll2n_prepend_unequal.i [2021-12-21 18:17:59,478 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 18:17:59,478 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 31 error locations. [2021-12-21 18:17:59,515 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 18:17:59,522 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 [2021-12-21 18:17:59,522 INFO L340 AbstractCegarLoop]: Starting to check reachability of 31 error locations. [2021-12-21 18:17:59,539 INFO L276 IsEmpty]: Start isEmpty. Operand has 81 states, 46 states have (on average 1.891304347826087) internal successors, (87), 77 states have internal predecessors, (87), 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) [2021-12-21 18:17:59,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-21 18:17:59,566 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:17:59,567 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:17:59,568 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:17:59,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:17:59,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1813443002, now seen corresponding path program 1 times [2021-12-21 18:17:59,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:17:59,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234543585] [2021-12-21 18:17:59,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:17:59,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:17:59,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:17:59,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:17:59,803 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:17:59,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234543585] [2021-12-21 18:17:59,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234543585] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:17:59,804 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:17:59,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 18:17:59,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470543065] [2021-12-21 18:17:59,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:17:59,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 18:17:59,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:17:59,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 18:17:59,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:17:59,846 INFO L87 Difference]: Start difference. First operand has 81 states, 46 states have (on average 1.891304347826087) internal successors, (87), 77 states have internal predecessors, (87), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-12-21 18:17:59,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:17:59,947 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2021-12-21 18:17:59,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 18:17:59,950 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 7 [2021-12-21 18:17:59,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:17:59,957 INFO L225 Difference]: With dead ends: 79 [2021-12-21 18:17:59,957 INFO L226 Difference]: Without dead ends: 76 [2021-12-21 18:17:59,958 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 [2021-12-21 18:17:59,961 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 8 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:17:59,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 127 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:17:59,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-21 18:17:59,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-12-21 18:17:59,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 44 states have (on average 1.75) internal successors, (77), 72 states have internal predecessors, (77), 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) [2021-12-21 18:18:00,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 81 transitions. [2021-12-21 18:18:00,001 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 81 transitions. Word has length 7 [2021-12-21 18:18:00,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:00,002 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 81 transitions. [2021-12-21 18:18:00,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-12-21 18:18:00,002 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 81 transitions. [2021-12-21 18:18:00,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-21 18:18:00,003 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:00,003 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:00,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 18:18:00,003 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:00,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:00,004 INFO L85 PathProgramCache]: Analyzing trace with hash 1813443001, now seen corresponding path program 1 times [2021-12-21 18:18:00,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:18:00,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135555802] [2021-12-21 18:18:00,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:00,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:18:00,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:00,041 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:00,041 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:18:00,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135555802] [2021-12-21 18:18:00,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135555802] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:00,042 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:00,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 18:18:00,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638362793] [2021-12-21 18:18:00,043 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:00,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 18:18:00,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:18:00,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 18:18:00,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:00,045 INFO L87 Difference]: Start difference. First operand 76 states and 81 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-12-21 18:18:00,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:00,106 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2021-12-21 18:18:00,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 18:18:00,107 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 7 [2021-12-21 18:18:00,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:00,110 INFO L225 Difference]: With dead ends: 74 [2021-12-21 18:18:00,111 INFO L226 Difference]: Without dead ends: 74 [2021-12-21 18:18:00,115 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 [2021-12-21 18:18:00,116 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 4 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:00,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 118 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 18:18:00,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-12-21 18:18:00,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-12-21 18:18:00,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 70 states have internal predecessors, (75), 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) [2021-12-21 18:18:00,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2021-12-21 18:18:00,129 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 7 [2021-12-21 18:18:00,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:00,130 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2021-12-21 18:18:00,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-12-21 18:18:00,130 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2021-12-21 18:18:00,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 18:18:00,131 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:00,131 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:00,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 18:18:00,131 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:00,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:00,133 INFO L85 PathProgramCache]: Analyzing trace with hash 712803264, now seen corresponding path program 1 times [2021-12-21 18:18:00,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:18:00,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177023622] [2021-12-21 18:18:00,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:00,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:18:00,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:00,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 18:18:00,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:00,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:00,283 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:18:00,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177023622] [2021-12-21 18:18:00,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177023622] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:00,283 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:00,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-21 18:18:00,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590748864] [2021-12-21 18:18:00,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:00,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 18:18:00,286 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:18:00,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 18:18:00,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-21 18:18:00,287 INFO L87 Difference]: Start difference. First operand 74 states and 79 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 18:18:00,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:00,447 INFO L93 Difference]: Finished difference Result 78 states and 86 transitions. [2021-12-21 18:18:00,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 18:18:00,448 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 13 [2021-12-21 18:18:00,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:00,450 INFO L225 Difference]: With dead ends: 78 [2021-12-21 18:18:00,450 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 18:18:00,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-21 18:18:00,451 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 11 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:00,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 281 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:00,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 18:18:00,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2021-12-21 18:18:00,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 44 states have (on average 1.6818181818181819) internal successors, (74), 69 states have internal predecessors, (74), 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) [2021-12-21 18:18:00,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 78 transitions. [2021-12-21 18:18:00,468 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 78 transitions. Word has length 13 [2021-12-21 18:18:00,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:00,468 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 78 transitions. [2021-12-21 18:18:00,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 18:18:00,470 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 78 transitions. [2021-12-21 18:18:00,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 18:18:00,470 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:00,470 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:00,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-21 18:18:00,471 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:00,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:00,471 INFO L85 PathProgramCache]: Analyzing trace with hash 712803265, now seen corresponding path program 1 times [2021-12-21 18:18:00,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:18:00,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200955369] [2021-12-21 18:18:00,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:00,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:18:00,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:00,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 18:18:00,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:00,643 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:00,644 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:18:00,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200955369] [2021-12-21 18:18:00,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200955369] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:00,645 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:00,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-21 18:18:00,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560481736] [2021-12-21 18:18:00,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:00,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 18:18:00,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:18:00,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 18:18:00,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-21 18:18:00,649 INFO L87 Difference]: Start difference. First operand 73 states and 78 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 18:18:00,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:00,802 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2021-12-21 18:18:00,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 18:18:00,803 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 13 [2021-12-21 18:18:00,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:00,804 INFO L225 Difference]: With dead ends: 77 [2021-12-21 18:18:00,804 INFO L226 Difference]: Without dead ends: 77 [2021-12-21 18:18:00,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-21 18:18:00,805 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 9 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:00,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 297 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:00,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-12-21 18:18:00,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 72. [2021-12-21 18:18:00,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 68 states have internal predecessors, (73), 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) [2021-12-21 18:18:00,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2021-12-21 18:18:00,810 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 13 [2021-12-21 18:18:00,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:00,811 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2021-12-21 18:18:00,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 18:18:00,811 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2021-12-21 18:18:00,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-21 18:18:00,812 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:00,812 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:00,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-21 18:18:00,812 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:00,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:00,812 INFO L85 PathProgramCache]: Analyzing trace with hash 150600896, now seen corresponding path program 1 times [2021-12-21 18:18:00,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:18:00,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499087430] [2021-12-21 18:18:00,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:00,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:18:00,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:00,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-12-21 18:18:00,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:00,881 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:00,882 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:18:00,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499087430] [2021-12-21 18:18:00,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499087430] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:00,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:00,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 18:18:00,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905734755] [2021-12-21 18:18:00,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:00,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 18:18:00,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:18:00,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 18:18:00,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 18:18:00,884 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 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) [2021-12-21 18:18:00,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:00,943 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2021-12-21 18:18:00,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 18:18:00,944 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 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 15 [2021-12-21 18:18:00,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:00,944 INFO L225 Difference]: With dead ends: 78 [2021-12-21 18:18:00,945 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 18:18:00,945 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 [2021-12-21 18:18:00,946 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 4 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:00,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 180 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 18:18:00,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 18:18:00,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2021-12-21 18:18:00,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 45 states have (on average 1.6444444444444444) internal successors, (74), 69 states have internal predecessors, (74), 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) [2021-12-21 18:18:00,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 78 transitions. [2021-12-21 18:18:00,956 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 78 transitions. Word has length 15 [2021-12-21 18:18:00,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:00,956 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 78 transitions. [2021-12-21 18:18:00,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 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) [2021-12-21 18:18:00,957 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 78 transitions. [2021-12-21 18:18:00,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-21 18:18:00,957 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:00,958 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:00,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-21 18:18:00,958 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:00,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:00,962 INFO L85 PathProgramCache]: Analyzing trace with hash -513998014, now seen corresponding path program 1 times [2021-12-21 18:18:00,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:18:00,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449546702] [2021-12-21 18:18:00,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:00,962 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:18:00,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:01,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 18:18:01,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:01,048 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-21 18:18:01,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:01,059 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-21 18:18:01,060 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:18:01,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449546702] [2021-12-21 18:18:01,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449546702] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:18:01,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639724060] [2021-12-21 18:18:01,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:01,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:18:01,061 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:18:01,062 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 18:18:01,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 18:18:01,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:01,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 18:18:01,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:01,318 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:01,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:18:01,387 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-21 18:18:01,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639724060] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:18:01,388 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:18:01,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 6 [2021-12-21 18:18:01,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617521685] [2021-12-21 18:18:01,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:18:01,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 18:18:01,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:18:01,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 18:18:01,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:01,390 INFO L87 Difference]: Start difference. First operand 73 states and 78 transitions. Second operand has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-21 18:18:01,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:01,460 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2021-12-21 18:18:01,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 18:18:01,460 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 28 [2021-12-21 18:18:01,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:01,461 INFO L225 Difference]: With dead ends: 79 [2021-12-21 18:18:01,461 INFO L226 Difference]: Without dead ends: 79 [2021-12-21 18:18:01,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:01,462 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 8 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:01,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 250 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:01,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-12-21 18:18:01,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-12-21 18:18:01,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 50 states have (on average 1.58) internal successors, (79), 74 states have internal predecessors, (79), 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) [2021-12-21 18:18:01,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2021-12-21 18:18:01,467 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 28 [2021-12-21 18:18:01,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:01,468 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2021-12-21 18:18:01,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-21 18:18:01,468 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2021-12-21 18:18:01,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-21 18:18:01,469 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:01,469 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:01,510 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:01,695 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 [2021-12-21 18:18:01,696 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:01,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:01,696 INFO L85 PathProgramCache]: Analyzing trace with hash -416014336, now seen corresponding path program 2 times [2021-12-21 18:18:01,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:18:01,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77739044] [2021-12-21 18:18:01,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:01,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:18:01,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:01,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 18:18:01,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:01,913 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-21 18:18:01,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:01,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-12-21 18:18:01,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:02,019 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-21 18:18:02,020 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:18:02,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77739044] [2021-12-21 18:18:02,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77739044] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:18:02,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299023676] [2021-12-21 18:18:02,020 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 18:18:02,021 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:18:02,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:18:02,024 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 18:18:02,032 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 18:18:02,152 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 18:18:02,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:18:02,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-21 18:18:02,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:02,210 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 [2021-12-21 18:18:02,323 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 18:18:02,323 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 [2021-12-21 18:18:02,479 INFO L353 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-12-21 18:18:02,480 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 14 [2021-12-21 18:18:02,553 INFO L353 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-12-21 18:18:02,554 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 14 [2021-12-21 18:18:02,569 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-21 18:18:02,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:18:03,121 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-21 18:18:03,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299023676] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-21 18:18:03,122 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-21 18:18:03,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 9] total 20 [2021-12-21 18:18:03,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585364922] [2021-12-21 18:18:03,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:03,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-21 18:18:03,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:18:03,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-21 18:18:03,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-12-21 18:18:03,126 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 18:18:03,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:03,216 INFO L93 Difference]: Finished difference Result 88 states and 95 transitions. [2021-12-21 18:18:03,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 18:18:03,217 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-12-21 18:18:03,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:03,218 INFO L225 Difference]: With dead ends: 88 [2021-12-21 18:18:03,218 INFO L226 Difference]: Without dead ends: 88 [2021-12-21 18:18:03,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 66 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-12-21 18:18:03,220 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 105 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:03,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 178 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 87 Invalid, 0 Unknown, 75 Unchecked, 0.1s Time] [2021-12-21 18:18:03,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-12-21 18:18:03,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 76. [2021-12-21 18:18:03,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 50 states have (on average 1.52) internal successors, (76), 71 states have internal predecessors, (76), 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) [2021-12-21 18:18:03,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2021-12-21 18:18:03,225 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 41 [2021-12-21 18:18:03,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:03,226 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2021-12-21 18:18:03,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 18:18:03,227 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2021-12-21 18:18:03,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-21 18:18:03,227 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:03,228 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:03,249 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:03,439 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 [2021-12-21 18:18:03,440 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:03,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:03,440 INFO L85 PathProgramCache]: Analyzing trace with hash -416014335, now seen corresponding path program 1 times [2021-12-21 18:18:03,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 18:18:03,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075066213] [2021-12-21 18:18:03,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:03,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 18:18:03,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:03,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2021-12-21 18:18:03,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:03,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-21 18:18:03,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:03,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-12-21 18:18:03,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:03,678 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 18:18:03,678 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 18:18:03,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075066213] [2021-12-21 18:18:03,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075066213] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:18:03,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648396828] [2021-12-21 18:18:03,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:03,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:18:03,679 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:18:03,680 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 18:18:03,682 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 18:18:03,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:03,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-21 18:18:03,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:03,835 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 [2021-12-21 18:18:03,862 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 [2021-12-21 18:18:03,995 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: line 40633 column 46: unknown constant v_#length_BEFORE_CALL_2 [2021-12-21 18:18:03,995 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-21 18:18:03,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-12-21 18:18:03,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987211733] [2021-12-21 18:18:03,996 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-21 18:18:03,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-21 18:18:03,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 18:18:03,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-21 18:18:03,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-12-21 18:18:03,997 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand has 11 states, 10 states have (on average 2.9) internal successors, (29), 10 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-21 18:18:03,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-21 18:18:03,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-12-21 18:18:03,998 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 [2021-12-21 18:18:03,999 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] [2021-12-21 18:18:04,025 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:04,223 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 [2021-12-21 18:18:04,224 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@2f8c71b9 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) [2021-12-21 18:18:04,227 INFO L158 Benchmark]: Toolchain (without parser) took 5700.09ms. Allocated memory was 90.2MB in the beginning and 134.2MB in the end (delta: 44.0MB). Free memory was 53.2MB in the beginning and 91.7MB in the end (delta: -38.6MB). Peak memory consumption was 3.7MB. Max. memory is 16.1GB. [2021-12-21 18:18:04,227 INFO L158 Benchmark]: CDTParser took 0.22ms. Allocated memory is still 90.2MB. Free memory is still 70.4MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-21 18:18:04,227 INFO L158 Benchmark]: CACSL2BoogieTranslator took 403.29ms. Allocated memory is still 90.2MB. Free memory was 53.0MB in the beginning and 60.2MB in the end (delta: -7.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-21 18:18:04,228 INFO L158 Benchmark]: Boogie Procedure Inliner took 58.74ms. Allocated memory is still 90.2MB. Free memory was 60.2MB in the beginning and 58.1MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-21 18:18:04,228 INFO L158 Benchmark]: Boogie Preprocessor took 34.37ms. Allocated memory is still 90.2MB. Free memory was 58.1MB in the beginning and 56.4MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-21 18:18:04,228 INFO L158 Benchmark]: RCFGBuilder took 434.12ms. Allocated memory is still 90.2MB. Free memory was 56.4MB in the beginning and 40.0MB in the end (delta: 16.4MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. [2021-12-21 18:18:04,228 INFO L158 Benchmark]: TraceAbstraction took 4764.70ms. Allocated memory was 90.2MB in the beginning and 134.2MB in the end (delta: 44.0MB). Free memory was 39.6MB in the beginning and 91.7MB in the end (delta: -52.1MB). There was no memory consumed. Max. memory is 16.1GB. [2021-12-21 18:18:04,229 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22ms. Allocated memory is still 90.2MB. Free memory is still 70.4MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 403.29ms. Allocated memory is still 90.2MB. Free memory was 53.0MB in the beginning and 60.2MB in the end (delta: -7.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 58.74ms. Allocated memory is still 90.2MB. Free memory was 60.2MB in the beginning and 58.1MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 34.37ms. Allocated memory is still 90.2MB. Free memory was 58.1MB in the beginning and 56.4MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 434.12ms. Allocated memory is still 90.2MB. Free memory was 56.4MB in the beginning and 40.0MB in the end (delta: 16.4MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. * TraceAbstraction took 4764.70ms. Allocated memory was 90.2MB in the beginning and 134.2MB in the end (delta: 44.0MB). Free memory was 39.6MB in the beginning and 91.7MB in the end (delta: -52.1MB). 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@2f8c71b9 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@2f8c71b9: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-12-21 18:18:04,250 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with 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/sll2n_prepend_unequal.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 277634da297b7f9e262585608ed7ad62cca7d59b0122d4e61ee1b4b78256acae --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 18:18:06,298 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 18:18:06,301 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 18:18:06,341 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 18:18:06,342 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 18:18:06,345 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 18:18:06,346 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 18:18:06,352 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 18:18:06,355 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 18:18:06,359 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 18:18:06,360 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 18:18:06,361 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 18:18:06,361 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 18:18:06,364 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 18:18:06,365 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 18:18:06,370 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 18:18:06,371 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 18:18:06,372 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 18:18:06,374 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 18:18:06,379 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 18:18:06,381 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 18:18:06,382 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 18:18:06,383 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 18:18:06,385 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 18:18:06,391 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 18:18:06,391 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 18:18:06,392 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 18:18:06,393 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 18:18:06,394 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 18:18:06,394 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 18:18:06,395 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 18:18:06,395 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 18:18:06,397 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 18:18:06,397 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 18:18:06,398 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 18:18:06,399 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 18:18:06,399 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 18:18:06,400 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 18:18:06,400 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 18:18:06,401 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 18:18:06,402 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 18:18:06,406 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-12-21 18:18:06,442 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 18:18:06,442 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 18:18:06,443 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 18:18:06,444 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 18:18:06,444 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 18:18:06,445 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 18:18:06,446 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 18:18:06,447 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 18:18:06,447 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 18:18:06,447 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 18:18:06,448 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 18:18:06,448 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-21 18:18:06,448 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 18:18:06,449 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 18:18:06,449 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 18:18:06,449 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-21 18:18:06,449 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-21 18:18:06,449 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-21 18:18:06,450 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 18:18:06,450 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-21 18:18:06,450 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-21 18:18:06,450 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-21 18:18:06,450 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 18:18:06,451 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 18:18:06,451 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 18:18:06,451 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 18:18:06,451 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 18:18:06,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 18:18:06,460 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 18:18:06,461 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 18:18:06,461 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-21 18:18:06,461 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-21 18:18:06,461 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 18:18:06,462 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-21 18:18:06,462 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 277634da297b7f9e262585608ed7ad62cca7d59b0122d4e61ee1b4b78256acae [2021-12-21 18:18:06,780 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 18:18:06,810 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 18:18:06,813 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 18:18:06,815 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 18:18:06,816 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 18:18:06,817 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i [2021-12-21 18:18:06,883 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34bcb182b/e74fc21403a74de7976ae3fb18365201/FLAGf1751f129 [2021-12-21 18:18:07,325 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 18:18:07,325 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i [2021-12-21 18:18:07,336 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34bcb182b/e74fc21403a74de7976ae3fb18365201/FLAGf1751f129 [2021-12-21 18:18:07,671 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34bcb182b/e74fc21403a74de7976ae3fb18365201 [2021-12-21 18:18:07,674 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 18:18:07,675 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 18:18:07,679 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 18:18:07,680 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 18:18:07,685 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 18:18:07,686 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 06:18:07" (1/1) ... [2021-12-21 18:18:07,688 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33de93b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:07, skipping insertion in model container [2021-12-21 18:18:07,688 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 06:18:07" (1/1) ... [2021-12-21 18:18:07,694 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 18:18:07,740 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 18:18:08,018 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/sll2n_prepend_unequal.i[24165,24178] [2021-12-21 18:18:08,020 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 18:18:08,045 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 18:18:08,102 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/sll2n_prepend_unequal.i[24165,24178] [2021-12-21 18:18:08,105 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 18:18:08,142 INFO L208 MainTranslator]: Completed translation [2021-12-21 18:18:08,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08 WrapperNode [2021-12-21 18:18:08,143 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 18:18:08,144 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 18:18:08,144 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 18:18:08,145 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 18:18:08,150 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,166 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,187 INFO L137 Inliner]: procedures = 130, calls = 32, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 116 [2021-12-21 18:18:08,187 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 18:18:08,188 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 18:18:08,188 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 18:18:08,188 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 18:18:08,196 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,196 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,212 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,212 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,221 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,233 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,239 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,242 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 18:18:08,243 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 18:18:08,243 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 18:18:08,243 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 18:18:08,253 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (1/1) ... [2021-12-21 18:18:08,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 18:18:08,271 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:18:08,284 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 18:18:08,287 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 18:18:08,313 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-21 18:18:08,313 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-12-21 18:18:08,313 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-12-21 18:18:08,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-21 18:18:08,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 18:18:08,314 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-21 18:18:08,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-21 18:18:08,314 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-21 18:18:08,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-21 18:18:08,327 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-21 18:18:08,327 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-21 18:18:08,327 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-21 18:18:08,328 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 18:18:08,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 18:18:08,426 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 18:18:08,428 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 18:18:08,840 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 18:18:08,854 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 18:18:08,855 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-21 18:18:08,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 06:18:08 BoogieIcfgContainer [2021-12-21 18:18:08,857 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 18:18:08,859 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 18:18:08,859 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 18:18:08,862 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 18:18:08,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 06:18:07" (1/3) ... [2021-12-21 18:18:08,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@434e5dd1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 06:18:08, skipping insertion in model container [2021-12-21 18:18:08,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 06:18:08" (2/3) ... [2021-12-21 18:18:08,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@434e5dd1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 06:18:08, skipping insertion in model container [2021-12-21 18:18:08,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 06:18:08" (3/3) ... [2021-12-21 18:18:08,865 INFO L111 eAbstractionObserver]: Analyzing ICFG sll2n_prepend_unequal.i [2021-12-21 18:18:08,872 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 18:18:08,872 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 31 error locations. [2021-12-21 18:18:08,922 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 18:18:08,947 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 [2021-12-21 18:18:08,947 INFO L340 AbstractCegarLoop]: Starting to check reachability of 31 error locations. [2021-12-21 18:18:08,965 INFO L276 IsEmpty]: Start isEmpty. Operand has 81 states, 46 states have (on average 1.891304347826087) internal successors, (87), 77 states have internal predecessors, (87), 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) [2021-12-21 18:18:08,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-21 18:18:08,974 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:08,975 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:08,975 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:08,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:08,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1813443002, now seen corresponding path program 1 times [2021-12-21 18:18:08,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:08,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [696740868] [2021-12-21 18:18:08,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:08,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:08,992 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:08,994 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) [2021-12-21 18:18:08,995 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-21 18:18:09,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:09,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 18:18:09,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:09,209 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 [2021-12-21 18:18:09,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:09,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:09,237 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:09,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [696740868] [2021-12-21 18:18:09,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [696740868] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:09,238 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:09,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 18:18:09,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371084085] [2021-12-21 18:18:09,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:09,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 18:18:09,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:09,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 18:18:09,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:09,274 INFO L87 Difference]: Start difference. First operand has 81 states, 46 states have (on average 1.891304347826087) internal successors, (87), 77 states have internal predecessors, (87), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-12-21 18:18:09,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:09,440 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2021-12-21 18:18:09,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 18:18:09,444 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 7 [2021-12-21 18:18:09,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:09,450 INFO L225 Difference]: With dead ends: 79 [2021-12-21 18:18:09,450 INFO L226 Difference]: Without dead ends: 76 [2021-12-21 18:18:09,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:09,454 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 8 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:09,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 127 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:09,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-21 18:18:09,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-12-21 18:18:09,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 44 states have (on average 1.75) internal successors, (77), 72 states have internal predecessors, (77), 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) [2021-12-21 18:18:09,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 81 transitions. [2021-12-21 18:18:09,491 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 81 transitions. Word has length 7 [2021-12-21 18:18:09,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:09,491 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 81 transitions. [2021-12-21 18:18:09,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-12-21 18:18:09,491 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 81 transitions. [2021-12-21 18:18:09,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-12-21 18:18:09,492 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:09,492 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:09,504 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:09,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:09,701 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:09,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:09,702 INFO L85 PathProgramCache]: Analyzing trace with hash 1813443001, now seen corresponding path program 1 times [2021-12-21 18:18:09,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:09,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [87999086] [2021-12-21 18:18:09,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:09,703 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:09,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:09,704 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) [2021-12-21 18:18:09,706 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-21 18:18:09,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:09,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-21 18:18:09,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:09,791 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 [2021-12-21 18:18:09,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:09,804 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:09,805 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:09,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [87999086] [2021-12-21 18:18:09,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [87999086] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:09,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:09,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 18:18:09,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755341049] [2021-12-21 18:18:09,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:09,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 18:18:09,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:09,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 18:18:09,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:09,814 INFO L87 Difference]: Start difference. First operand 76 states and 81 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-12-21 18:18:09,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:09,919 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2021-12-21 18:18:09,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 18:18:09,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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 7 [2021-12-21 18:18:09,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:09,921 INFO L225 Difference]: With dead ends: 74 [2021-12-21 18:18:09,921 INFO L226 Difference]: Without dead ends: 74 [2021-12-21 18:18:09,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:09,922 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 4 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:09,922 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 118 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:09,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-12-21 18:18:09,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-12-21 18:18:09,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 70 states have internal predecessors, (75), 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) [2021-12-21 18:18:09,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2021-12-21 18:18:09,933 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 7 [2021-12-21 18:18:09,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:09,933 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2021-12-21 18:18:09,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-12-21 18:18:09,934 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2021-12-21 18:18:09,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 18:18:09,935 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:09,936 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:09,951 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:10,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:10,144 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:10,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:10,145 INFO L85 PathProgramCache]: Analyzing trace with hash 712803264, now seen corresponding path program 1 times [2021-12-21 18:18:10,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:10,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [315851827] [2021-12-21 18:18:10,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:10,146 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:10,146 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:10,147 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) [2021-12-21 18:18:10,149 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-21 18:18:10,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:10,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 18:18:10,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:10,251 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 [2021-12-21 18:18:10,310 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:10,311 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:10,311 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:10,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [315851827] [2021-12-21 18:18:10,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [315851827] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:10,314 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:10,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 18:18:10,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247684053] [2021-12-21 18:18:10,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:10,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 18:18:10,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:10,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 18:18:10,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:10,317 INFO L87 Difference]: Start difference. First operand 74 states and 79 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 18:18:10,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:10,561 INFO L93 Difference]: Finished difference Result 78 states and 86 transitions. [2021-12-21 18:18:10,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 18:18:10,562 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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 13 [2021-12-21 18:18:10,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:10,564 INFO L225 Difference]: With dead ends: 78 [2021-12-21 18:18:10,564 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 18:18:10,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-21 18:18:10,565 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 10 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:10,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 251 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 18:18:10,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 18:18:10,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2021-12-21 18:18:10,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 44 states have (on average 1.6818181818181819) internal successors, (74), 69 states have internal predecessors, (74), 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) [2021-12-21 18:18:10,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 78 transitions. [2021-12-21 18:18:10,573 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 78 transitions. Word has length 13 [2021-12-21 18:18:10,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:10,574 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 78 transitions. [2021-12-21 18:18:10,574 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 18:18:10,579 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 78 transitions. [2021-12-21 18:18:10,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 18:18:10,580 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:10,580 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:10,588 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-12-21 18:18:10,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:10,788 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:10,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:10,788 INFO L85 PathProgramCache]: Analyzing trace with hash 712803265, now seen corresponding path program 1 times [2021-12-21 18:18:10,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:10,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [590142655] [2021-12-21 18:18:10,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:10,789 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:10,790 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:10,791 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) [2021-12-21 18:18:10,793 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-21 18:18:10,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:10,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 18:18:10,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:10,900 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 [2021-12-21 18:18:11,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:11,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:11,008 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:11,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [590142655] [2021-12-21 18:18:11,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [590142655] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:11,008 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:11,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 18:18:11,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051258139] [2021-12-21 18:18:11,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:11,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 18:18:11,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:11,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 18:18:11,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:11,012 INFO L87 Difference]: Start difference. First operand 73 states and 78 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 18:18:11,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:11,271 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2021-12-21 18:18:11,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 18:18:11,273 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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 13 [2021-12-21 18:18:11,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:11,274 INFO L225 Difference]: With dead ends: 77 [2021-12-21 18:18:11,274 INFO L226 Difference]: Without dead ends: 77 [2021-12-21 18:18:11,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-21 18:18:11,275 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 9 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:11,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 267 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 18:18:11,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-12-21 18:18:11,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 72. [2021-12-21 18:18:11,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 44 states have (on average 1.6590909090909092) internal successors, (73), 68 states have internal predecessors, (73), 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) [2021-12-21 18:18:11,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2021-12-21 18:18:11,280 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 13 [2021-12-21 18:18:11,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:11,281 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2021-12-21 18:18:11,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-12-21 18:18:11,281 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2021-12-21 18:18:11,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-21 18:18:11,281 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:11,281 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:11,293 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:11,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:11,491 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:11,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:11,491 INFO L85 PathProgramCache]: Analyzing trace with hash 150600896, now seen corresponding path program 1 times [2021-12-21 18:18:11,491 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:11,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [757368567] [2021-12-21 18:18:11,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:11,492 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:11,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:11,493 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) [2021-12-21 18:18:11,495 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-21 18:18:11,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:11,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 18:18:11,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:11,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:11,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:11,603 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:11,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [757368567] [2021-12-21 18:18:11,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [757368567] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:11,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:11,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 18:18:11,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415133842] [2021-12-21 18:18:11,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:11,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 18:18:11,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:11,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 18:18:11,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:11,605 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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) [2021-12-21 18:18:11,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:11,611 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2021-12-21 18:18:11,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 18:18:11,613 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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 15 [2021-12-21 18:18:11,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:11,613 INFO L225 Difference]: With dead ends: 78 [2021-12-21 18:18:11,614 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 18:18:11,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:11,615 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 4 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 149 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 [2021-12-21 18:18:11,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 149 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 18:18:11,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 18:18:11,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2021-12-21 18:18:11,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 45 states have (on average 1.6444444444444444) internal successors, (74), 69 states have internal predecessors, (74), 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) [2021-12-21 18:18:11,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 78 transitions. [2021-12-21 18:18:11,620 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 78 transitions. Word has length 15 [2021-12-21 18:18:11,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:11,621 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 78 transitions. [2021-12-21 18:18:11,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 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) [2021-12-21 18:18:11,621 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 78 transitions. [2021-12-21 18:18:11,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-21 18:18:11,622 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:11,622 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:11,631 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-12-21 18:18:11,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:11,831 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:11,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:11,832 INFO L85 PathProgramCache]: Analyzing trace with hash -513998014, now seen corresponding path program 1 times [2021-12-21 18:18:11,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:11,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [31872429] [2021-12-21 18:18:11,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:11,833 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:11,833 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:11,834 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) [2021-12-21 18:18:11,835 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-21 18:18:11,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:11,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 18:18:11,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:12,002 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:12,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:18:12,083 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-21 18:18:12,083 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:12,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [31872429] [2021-12-21 18:18:12,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [31872429] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:18:12,086 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 18:18:12,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-12-21 18:18:12,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969934509] [2021-12-21 18:18:12,087 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 18:18:12,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 18:18:12,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:12,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 18:18:12,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:12,091 INFO L87 Difference]: Start difference. First operand 73 states and 78 transitions. Second operand has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-21 18:18:12,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:12,129 INFO L93 Difference]: Finished difference Result 84 states and 91 transitions. [2021-12-21 18:18:12,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 18:18:12,130 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 28 [2021-12-21 18:18:12,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:12,131 INFO L225 Difference]: With dead ends: 84 [2021-12-21 18:18:12,131 INFO L226 Difference]: Without dead ends: 84 [2021-12-21 18:18:12,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:12,134 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 11 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:12,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 370 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 18:18:12,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-21 18:18:12,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2021-12-21 18:18:12,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 50 states have (on average 1.58) internal successors, (79), 74 states have internal predecessors, (79), 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) [2021-12-21 18:18:12,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2021-12-21 18:18:12,154 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 28 [2021-12-21 18:18:12,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:12,155 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2021-12-21 18:18:12,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-21 18:18:12,155 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2021-12-21 18:18:12,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-21 18:18:12,156 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:12,156 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:12,167 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:12,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:12,367 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:12,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:12,367 INFO L85 PathProgramCache]: Analyzing trace with hash -416014336, now seen corresponding path program 2 times [2021-12-21 18:18:12,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:12,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1176598582] [2021-12-21 18:18:12,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 18:18:12,368 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:12,368 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:12,369 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) [2021-12-21 18:18:12,369 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-21 18:18:12,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 18:18:12,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:18:12,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-21 18:18:12,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:12,546 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 18:18:12,587 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 7 treesize of output 5 [2021-12-21 18:18:12,774 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-21 18:18:12,775 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 20 treesize of output 27 [2021-12-21 18:18:12,830 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 7 treesize of output 5 [2021-12-21 18:18:12,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:12,969 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 14 treesize of output 16 [2021-12-21 18:18:13,223 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 18:18:13,223 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 [2021-12-21 18:18:13,265 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 18:18:13,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:18:13,546 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:13,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1176598582] [2021-12-21 18:18:13,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1176598582] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:18:13,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [547632273] [2021-12-21 18:18:13,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 18:18:13,547 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 18:18:13,547 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 18:18:13,549 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) [2021-12-21 18:18:13,587 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-12-21 18:18:13,792 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-21 18:18:13,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331209612] [2021-12-21 18:18:13,792 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 18:18:13,792 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:18:13,792 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 18:18:13,798 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 18:18:13,798 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 1 [2021-12-21 18:18:13,799 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 18:18:13,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 18:18:13,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 18:18:13,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 18:18:13,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:13,964 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 [2021-12-21 18:18:16,095 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-21 18:18:16,095 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 18 treesize of output 25 [2021-12-21 18:18:16,225 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 18:18:16,226 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 [2021-12-21 18:18:16,391 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 18:18:16,391 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 [2021-12-21 18:18:16,416 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 8 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-21 18:18:16,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:18:16,996 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-21 18:18:16,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331209612] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 18:18:16,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 18:18:16,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 5] total 15 [2021-12-21 18:18:16,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54216455] [2021-12-21 18:18:16,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 18:18:16,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 18:18:16,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:16,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 18:18:16,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=220, Unknown=1, NotChecked=0, Total=272 [2021-12-21 18:18:16,998 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 16 states, 15 states have (on average 4.2) internal successors, (63), 14 states have internal predecessors, (63), 4 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 18:18:23,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:23,373 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2021-12-21 18:18:23,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-21 18:18:23,374 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 4.2) internal successors, (63), 14 states have internal predecessors, (63), 4 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 41 [2021-12-21 18:18:23,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:23,375 INFO L225 Difference]: With dead ends: 96 [2021-12-21 18:18:23,375 INFO L226 Difference]: Without dead ends: 96 [2021-12-21 18:18:23,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 106 SyntacticMatches, 19 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=96, Invalid=409, Unknown=1, NotChecked=0, Total=506 [2021-12-21 18:18:23,376 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 85 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 241 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:23,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 447 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 91 Invalid, 0 Unknown, 241 Unchecked, 0.1s Time] [2021-12-21 18:18:23,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-12-21 18:18:23,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 84. [2021-12-21 18:18:23,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 56 states have (on average 1.4821428571428572) internal successors, (83), 78 states have internal predecessors, (83), 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) [2021-12-21 18:18:23,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 89 transitions. [2021-12-21 18:18:23,380 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 89 transitions. Word has length 41 [2021-12-21 18:18:23,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:23,380 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 89 transitions. [2021-12-21 18:18:23,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 4.2) internal successors, (63), 14 states have internal predecessors, (63), 4 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-21 18:18:23,380 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 89 transitions. [2021-12-21 18:18:23,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-12-21 18:18:23,381 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:23,381 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:23,399 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:23,625 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:23,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 18:18:23,797 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:23,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:23,797 INFO L85 PathProgramCache]: Analyzing trace with hash -416014335, now seen corresponding path program 1 times [2021-12-21 18:18:23,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:23,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2071257264] [2021-12-21 18:18:23,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:23,798 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:23,798 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:23,799 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) [2021-12-21 18:18:23,800 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-21 18:18:23,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:23,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-21 18:18:24,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:24,018 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 [2021-12-21 18:18:24,036 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 [2021-12-21 18:18:24,077 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 [2021-12-21 18:18:24,082 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 [2021-12-21 18:18:26,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:26,324 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 [2021-12-21 18:18:26,341 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-21 18:18:26,341 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 12 [2021-12-21 18:18:26,461 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 [2021-12-21 18:18:28,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:28,717 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 14 [2021-12-21 18:18:29,244 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 18:18:29,244 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 [2021-12-21 18:18:29,390 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 18:18:29,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:18:29,717 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:29,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2071257264] [2021-12-21 18:18:29,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2071257264] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:18:29,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [131290952] [2021-12-21 18:18:29,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:29,717 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-21 18:18:29,717 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-21 18:18:29,718 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-21 18:18:29,723 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-12-21 18:18:29,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:29,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 18:18:29,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:29,989 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 [2021-12-21 18:18:30,015 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 [2021-12-21 18:18:30,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:30,223 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 [2021-12-21 18:18:30,376 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 [2021-12-21 18:18:32,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:32,726 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 [2021-12-21 18:18:33,043 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 [2021-12-21 18:18:33,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:33,258 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 [2021-12-21 18:18:33,398 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-21 18:18:33,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:18:33,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [131290952] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 18:18:33,625 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-21 18:18:33,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2021-12-21 18:18:33,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887343637] [2021-12-21 18:18:33,626 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-21 18:18:33,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 18:18:33,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:33,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 18:18:33,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=479, Unknown=3, NotChecked=0, Total=552 [2021-12-21 18:18:33,627 INFO L87 Difference]: Start difference. First operand 84 states and 89 transitions. Second operand has 21 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 16 states have internal predecessors, (60), 5 states have call successors, (5), 4 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-21 18:18:42,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:42,598 INFO L93 Difference]: Finished difference Result 90 states and 94 transitions. [2021-12-21 18:18:42,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 18:18:42,598 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 16 states have internal predecessors, (60), 5 states have call successors, (5), 4 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 41 [2021-12-21 18:18:42,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:42,599 INFO L225 Difference]: With dead ends: 90 [2021-12-21 18:18:42,599 INFO L226 Difference]: Without dead ends: 90 [2021-12-21 18:18:42,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=115, Invalid=808, Unknown=7, NotChecked=0, Total=930 [2021-12-21 18:18:42,601 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 4 mSDsluCounter, 508 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 577 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 218 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:42,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 577 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 137 Invalid, 0 Unknown, 218 Unchecked, 0.3s Time] [2021-12-21 18:18:42,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-12-21 18:18:42,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-12-21 18:18:42,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 83 states have internal predecessors, (88), 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) [2021-12-21 18:18:42,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-12-21 18:18:42,606 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 41 [2021-12-21 18:18:42,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:42,606 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-12-21 18:18:42,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 16 states have internal predecessors, (60), 5 states have call successors, (5), 4 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-21 18:18:42,607 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-12-21 18:18:42,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-21 18:18:42,607 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:42,608 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:42,623 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:42,822 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:43,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-21 18:18:43,019 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:43,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:43,020 INFO L85 PathProgramCache]: Analyzing trace with hash -11542527, now seen corresponding path program 1 times [2021-12-21 18:18:43,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:43,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [660681960] [2021-12-21 18:18:43,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:43,020 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:43,021 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:43,021 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) [2021-12-21 18:18:43,022 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-21 18:18:43,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:43,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 18:18:43,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:43,247 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 [2021-12-21 18:18:43,389 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-21 18:18:43,389 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:43,390 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:43,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [660681960] [2021-12-21 18:18:43,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [660681960] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:43,390 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:43,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 18:18:43,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080021370] [2021-12-21 18:18:43,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:43,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 18:18:43,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:43,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 18:18:43,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:43,391 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 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) [2021-12-21 18:18:43,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:43,697 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2021-12-21 18:18:43,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 18:18:43,698 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 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 42 [2021-12-21 18:18:43,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:43,699 INFO L225 Difference]: With dead ends: 89 [2021-12-21 18:18:43,699 INFO L226 Difference]: Without dead ends: 89 [2021-12-21 18:18:43,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-21 18:18:43,700 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 53 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:43,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 184 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-21 18:18:43,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-12-21 18:18:43,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-12-21 18:18:43,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 62 states have (on average 1.403225806451613) internal successors, (87), 82 states have internal predecessors, (87), 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) [2021-12-21 18:18:43,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2021-12-21 18:18:43,704 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 42 [2021-12-21 18:18:43,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:43,704 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2021-12-21 18:18:43,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 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) [2021-12-21 18:18:43,705 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2021-12-21 18:18:43,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-21 18:18:43,706 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:43,706 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:43,718 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:43,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:43,916 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:43,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:43,916 INFO L85 PathProgramCache]: Analyzing trace with hash -11542528, now seen corresponding path program 1 times [2021-12-21 18:18:43,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:43,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1788314668] [2021-12-21 18:18:43,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:43,918 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:43,918 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:43,919 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) [2021-12-21 18:18:43,921 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-21 18:18:44,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:44,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-21 18:18:44,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:44,127 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 [2021-12-21 18:18:44,174 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-21 18:18:44,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:44,174 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:44,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1788314668] [2021-12-21 18:18:44,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1788314668] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:44,175 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:44,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 18:18:44,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696247932] [2021-12-21 18:18:44,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:44,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 18:18:44,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:44,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 18:18:44,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:44,176 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 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) [2021-12-21 18:18:44,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:44,413 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2021-12-21 18:18:44,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 18:18:44,413 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 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 42 [2021-12-21 18:18:44,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:44,414 INFO L225 Difference]: With dead ends: 100 [2021-12-21 18:18:44,414 INFO L226 Difference]: Without dead ends: 100 [2021-12-21 18:18:44,414 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-21 18:18:44,415 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 49 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:44,415 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 181 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 18:18:44,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-12-21 18:18:44,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 88. [2021-12-21 18:18:44,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 62 states have (on average 1.3870967741935485) internal successors, (86), 81 states have internal predecessors, (86), 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) [2021-12-21 18:18:44,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-12-21 18:18:44,419 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 42 [2021-12-21 18:18:44,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:44,420 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-12-21 18:18:44,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 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) [2021-12-21 18:18:44,420 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-12-21 18:18:44,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-21 18:18:44,421 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:44,421 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:44,430 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-12-21 18:18:44,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:44,627 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:44,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:44,628 INFO L85 PathProgramCache]: Analyzing trace with hash 1792532577, now seen corresponding path program 1 times [2021-12-21 18:18:44,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:44,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [569962793] [2021-12-21 18:18:44,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:44,628 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:44,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:44,629 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) [2021-12-21 18:18:44,630 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-21 18:18:44,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:44,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 2 conjunts are in the unsatisfiable core [2021-12-21 18:18:44,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:44,824 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-21 18:18:44,825 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:44,825 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:44,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [569962793] [2021-12-21 18:18:44,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [569962793] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:44,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:44,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-21 18:18:44,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719256718] [2021-12-21 18:18:44,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:44,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 18:18:44,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:44,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 18:18:44,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:44,827 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 3 states, 2 states have (on average 10.5) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-21 18:18:44,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:44,922 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2021-12-21 18:18:44,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 18:18:44,923 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 10.5) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 44 [2021-12-21 18:18:44,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:44,924 INFO L225 Difference]: With dead ends: 99 [2021-12-21 18:18:44,924 INFO L226 Difference]: Without dead ends: 99 [2021-12-21 18:18:44,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 18:18:44,925 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 44 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:44,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 74 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:44,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-12-21 18:18:44,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 87. [2021-12-21 18:18:44,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 62 states have (on average 1.3709677419354838) internal successors, (85), 80 states have internal predecessors, (85), 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) [2021-12-21 18:18:44,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2021-12-21 18:18:44,928 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 44 [2021-12-21 18:18:44,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:44,929 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2021-12-21 18:18:44,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 10.5) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-21 18:18:44,929 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2021-12-21 18:18:44,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-21 18:18:44,930 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:44,930 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:44,938 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-12-21 18:18:45,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:45,135 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:45,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:45,136 INFO L85 PathProgramCache]: Analyzing trace with hash 1792532578, now seen corresponding path program 1 times [2021-12-21 18:18:45,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:45,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1376166836] [2021-12-21 18:18:45,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:45,136 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:45,137 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:45,137 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) [2021-12-21 18:18:45,140 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-21 18:18:45,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:45,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 18:18:45,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:45,410 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-21 18:18:45,411 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:45,411 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:45,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1376166836] [2021-12-21 18:18:45,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1376166836] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:45,411 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:45,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 18:18:45,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914915524] [2021-12-21 18:18:45,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:45,412 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 18:18:45,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:45,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 18:18:45,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-21 18:18:45,413 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 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) [2021-12-21 18:18:45,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:45,501 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2021-12-21 18:18:45,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 18:18:45,502 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 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 44 [2021-12-21 18:18:45,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:45,502 INFO L225 Difference]: With dead ends: 86 [2021-12-21 18:18:45,502 INFO L226 Difference]: Without dead ends: 86 [2021-12-21 18:18:45,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-12-21 18:18:45,503 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 144 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:45,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 81 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:45,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-12-21 18:18:45,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-12-21 18:18:45,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 62 states have (on average 1.3548387096774193) internal successors, (84), 79 states have internal predecessors, (84), 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) [2021-12-21 18:18:45,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-12-21 18:18:45,506 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 44 [2021-12-21 18:18:45,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:45,506 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-12-21 18:18:45,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 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) [2021-12-21 18:18:45,507 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-12-21 18:18:45,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-21 18:18:45,507 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:45,507 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:45,515 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-12-21 18:18:45,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:45,708 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:45,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:45,708 INFO L85 PathProgramCache]: Analyzing trace with hash 341921058, now seen corresponding path program 1 times [2021-12-21 18:18:45,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:45,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [473534241] [2021-12-21 18:18:45,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:45,709 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:45,709 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:45,710 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 18:18:45,711 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-21 18:18:45,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:45,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-21 18:18:45,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:45,921 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-21 18:18:45,921 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:45,921 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:45,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [473534241] [2021-12-21 18:18:45,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [473534241] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:45,922 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:45,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 18:18:45,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867648730] [2021-12-21 18:18:45,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:45,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 18:18:45,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:45,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 18:18:45,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 18:18:45,923 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 4 states, 3 states have (on average 7.666666666666667) internal successors, (23), 4 states have internal predecessors, (23), 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) [2021-12-21 18:18:46,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:46,023 INFO L93 Difference]: Finished difference Result 97 states and 102 transitions. [2021-12-21 18:18:46,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 18:18:46,023 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 7.666666666666667) internal successors, (23), 4 states have internal predecessors, (23), 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 46 [2021-12-21 18:18:46,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:46,024 INFO L225 Difference]: With dead ends: 97 [2021-12-21 18:18:46,024 INFO L226 Difference]: Without dead ends: 97 [2021-12-21 18:18:46,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-21 18:18:46,025 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 98 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:46,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 88 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:46,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-12-21 18:18:46,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 85. [2021-12-21 18:18:46,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 62 states have (on average 1.3387096774193548) internal successors, (83), 78 states have internal predecessors, (83), 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) [2021-12-21 18:18:46,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 89 transitions. [2021-12-21 18:18:46,028 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 89 transitions. Word has length 46 [2021-12-21 18:18:46,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:46,029 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 89 transitions. [2021-12-21 18:18:46,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 7.666666666666667) internal successors, (23), 4 states have internal predecessors, (23), 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) [2021-12-21 18:18:46,029 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 89 transitions. [2021-12-21 18:18:46,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-21 18:18:46,030 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:46,030 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:46,039 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-12-21 18:18:46,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:46,239 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:46,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:46,240 INFO L85 PathProgramCache]: Analyzing trace with hash 341921059, now seen corresponding path program 1 times [2021-12-21 18:18:46,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:46,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [252188830] [2021-12-21 18:18:46,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:46,240 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:46,240 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:46,241 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) [2021-12-21 18:18:46,242 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-12-21 18:18:46,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:46,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-21 18:18:46,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:46,541 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-21 18:18:46,542 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:46,542 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:46,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [252188830] [2021-12-21 18:18:46,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [252188830] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:46,542 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:46,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 18:18:46,542 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412158035] [2021-12-21 18:18:46,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:46,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 18:18:46,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:46,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 18:18:46,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-21 18:18:46,544 INFO L87 Difference]: Start difference. First operand 85 states and 89 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 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) [2021-12-21 18:18:46,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:46,645 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-12-21 18:18:46,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 18:18:46,652 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 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 46 [2021-12-21 18:18:46,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:46,653 INFO L225 Difference]: With dead ends: 83 [2021-12-21 18:18:46,653 INFO L226 Difference]: Without dead ends: 83 [2021-12-21 18:18:46,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-12-21 18:18:46,654 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 130 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:46,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 75 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 18:18:46,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-12-21 18:18:46,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-12-21 18:18:46,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 62 states have (on average 1.3064516129032258) internal successors, (81), 76 states have internal predecessors, (81), 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) [2021-12-21 18:18:46,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-12-21 18:18:46,658 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 46 [2021-12-21 18:18:46,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:46,660 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-12-21 18:18:46,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 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) [2021-12-21 18:18:46,660 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-12-21 18:18:46,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-21 18:18:46,661 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:46,661 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:46,671 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:46,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:46,870 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:46,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:46,870 INFO L85 PathProgramCache]: Analyzing trace with hash -2126344669, now seen corresponding path program 1 times [2021-12-21 18:18:46,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:46,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [675735362] [2021-12-21 18:18:46,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:46,871 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:46,871 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:46,871 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-21 18:18:46,872 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-21 18:18:47,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:47,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-21 18:18:47,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:47,082 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 [2021-12-21 18:18:47,194 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 11 treesize of output 7 [2021-12-21 18:18:47,217 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 17 treesize of output 9 [2021-12-21 18:18:47,244 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-21 18:18:47,244 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:47,244 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:47,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [675735362] [2021-12-21 18:18:47,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [675735362] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:47,244 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:47,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-21 18:18:47,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385370243] [2021-12-21 18:18:47,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:47,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 18:18:47,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:47,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 18:18:47,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-12-21 18:18:47,245 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 10 states, 8 states have (on average 3.875) internal successors, (31), 9 states have internal predecessors, (31), 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) [2021-12-21 18:18:47,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:47,705 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2021-12-21 18:18:47,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 18:18:47,706 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.875) internal successors, (31), 9 states have internal predecessors, (31), 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 48 [2021-12-21 18:18:47,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:47,706 INFO L225 Difference]: With dead ends: 94 [2021-12-21 18:18:47,706 INFO L226 Difference]: Without dead ends: 94 [2021-12-21 18:18:47,707 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-12-21 18:18:47,707 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 100 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:47,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 242 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 18:18:47,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-12-21 18:18:47,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 80. [2021-12-21 18:18:47,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 62 states have (on average 1.2580645161290323) internal successors, (78), 73 states have internal predecessors, (78), 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) [2021-12-21 18:18:47,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-12-21 18:18:47,710 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 48 [2021-12-21 18:18:47,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:47,711 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-12-21 18:18:47,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.875) internal successors, (31), 9 states have internal predecessors, (31), 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) [2021-12-21 18:18:47,711 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-12-21 18:18:47,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-21 18:18:47,712 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:47,712 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:47,724 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:47,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:47,915 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:47,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:47,916 INFO L85 PathProgramCache]: Analyzing trace with hash -2126344668, now seen corresponding path program 1 times [2021-12-21 18:18:47,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:47,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1587621303] [2021-12-21 18:18:47,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:47,916 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:47,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:47,917 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) [2021-12-21 18:18:47,927 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-12-21 18:18:48,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:48,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 18:18:48,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:48,136 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 [2021-12-21 18:18:48,301 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 11 treesize of output 7 [2021-12-21 18:18:48,309 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 11 treesize of output 7 [2021-12-21 18:18:48,344 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 17 treesize of output 9 [2021-12-21 18:18:48,349 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 [2021-12-21 18:18:48,396 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-21 18:18:48,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:48,396 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:48,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1587621303] [2021-12-21 18:18:48,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1587621303] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:48,396 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:48,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-12-21 18:18:48,397 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306242774] [2021-12-21 18:18:48,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:48,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 18:18:48,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:48,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 18:18:48,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-12-21 18:18:48,398 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand has 10 states, 8 states have (on average 3.875) internal successors, (31), 9 states have internal predecessors, (31), 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) [2021-12-21 18:18:49,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:49,032 INFO L93 Difference]: Finished difference Result 80 states and 83 transitions. [2021-12-21 18:18:49,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-21 18:18:49,033 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.875) internal successors, (31), 9 states have internal predecessors, (31), 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 48 [2021-12-21 18:18:49,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:49,033 INFO L225 Difference]: With dead ends: 80 [2021-12-21 18:18:49,034 INFO L226 Difference]: Without dead ends: 80 [2021-12-21 18:18:49,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-12-21 18:18:49,034 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 80 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:49,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 247 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-21 18:18:49,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-12-21 18:18:49,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2021-12-21 18:18:49,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 62 states have (on average 1.2258064516129032) internal successors, (76), 71 states have internal predecessors, (76), 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) [2021-12-21 18:18:49,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2021-12-21 18:18:49,037 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 48 [2021-12-21 18:18:49,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:49,037 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2021-12-21 18:18:49,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.875) internal successors, (31), 9 states have internal predecessors, (31), 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) [2021-12-21 18:18:49,037 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2021-12-21 18:18:49,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-21 18:18:49,038 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:49,038 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:49,051 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:49,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:49,240 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr25ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:49,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:49,240 INFO L85 PathProgramCache]: Analyzing trace with hash 987206626, now seen corresponding path program 1 times [2021-12-21 18:18:49,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:49,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2056686722] [2021-12-21 18:18:49,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:49,241 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:49,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:49,241 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) [2021-12-21 18:18:49,243 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-21 18:18:49,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:49,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-21 18:18:49,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:49,702 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 11 treesize of output 7 [2021-12-21 18:18:49,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:49,979 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 21 treesize of output 20 [2021-12-21 18:18:50,049 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 11 treesize of output 7 [2021-12-21 18:18:50,060 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 11 treesize of output 7 [2021-12-21 18:18:50,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:50,075 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 18 treesize of output 20 [2021-12-21 18:18:50,200 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 26 treesize of output 14 [2021-12-21 18:18:50,208 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 [2021-12-21 18:18:50,393 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 [2021-12-21 18:18:50,444 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-21 18:18:50,445 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:50,445 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:50,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2056686722] [2021-12-21 18:18:50,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2056686722] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:50,445 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:50,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-12-21 18:18:50,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404063076] [2021-12-21 18:18:50,445 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:50,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-21 18:18:50,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:50,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-21 18:18:50,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-12-21 18:18:50,446 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 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) [2021-12-21 18:18:50,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:50,791 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-12-21 18:18:50,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-21 18:18:50,792 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 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 50 [2021-12-21 18:18:50,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:50,793 INFO L225 Difference]: With dead ends: 78 [2021-12-21 18:18:50,793 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 18:18:50,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-12-21 18:18:50,795 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 13 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:50,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 422 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 74 Invalid, 0 Unknown, 89 Unchecked, 0.2s Time] [2021-12-21 18:18:50,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 18:18:50,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-12-21 18:18:50,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 62 states have (on average 1.2096774193548387) internal successors, (75), 71 states have internal predecessors, (75), 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) [2021-12-21 18:18:50,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2021-12-21 18:18:50,798 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 50 [2021-12-21 18:18:50,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:50,798 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2021-12-21 18:18:50,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 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) [2021-12-21 18:18:50,799 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2021-12-21 18:18:50,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-21 18:18:50,799 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:50,799 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:50,808 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-12-21 18:18:50,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:51,000 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:51,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:51,000 INFO L85 PathProgramCache]: Analyzing trace with hash -2063364139, now seen corresponding path program 1 times [2021-12-21 18:18:51,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:51,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [774873159] [2021-12-21 18:18:51,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:51,001 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:51,001 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:51,002 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) [2021-12-21 18:18:51,003 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-12-21 18:18:51,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:51,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 47 conjunts are in the unsatisfiable core [2021-12-21 18:18:51,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:51,334 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 [2021-12-21 18:18:51,582 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 [2021-12-21 18:18:51,988 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 18:18:51,989 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 25 [2021-12-21 18:18:52,013 INFO L353 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-12-21 18:18:52,013 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 17 treesize of output 22 [2021-12-21 18:18:52,024 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 11 treesize of output 9 [2021-12-21 18:18:52,372 INFO L353 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-12-21 18:18:52,373 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 31 treesize of output 26 [2021-12-21 18:18:52,502 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 11 treesize of output 7 [2021-12-21 18:18:52,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:52,519 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 27 [2021-12-21 18:18:52,641 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 [2021-12-21 18:18:52,992 INFO L353 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-21 18:18:52,992 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 27 [2021-12-21 18:18:53,471 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 18:18:53,471 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:53,471 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:53,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [774873159] [2021-12-21 18:18:53,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [774873159] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:53,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:53,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-12-21 18:18:53,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621948891] [2021-12-21 18:18:53,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:53,472 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-21 18:18:53,472 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:53,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-21 18:18:53,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=483, Unknown=1, NotChecked=0, Total=552 [2021-12-21 18:18:53,473 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand has 24 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 18:18:53,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:53,892 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-12-21 18:18:53,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 18:18:53,893 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 53 [2021-12-21 18:18:53,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:53,893 INFO L225 Difference]: With dead ends: 80 [2021-12-21 18:18:53,893 INFO L226 Difference]: Without dead ends: 80 [2021-12-21 18:18:53,894 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=92, Invalid=609, Unknown=1, NotChecked=0, Total=702 [2021-12-21 18:18:53,894 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 13 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 194 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:53,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 459 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 156 Invalid, 0 Unknown, 194 Unchecked, 0.3s Time] [2021-12-21 18:18:53,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-12-21 18:18:53,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-12-21 18:18:53,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 64 states have (on average 1.234375) internal successors, (79), 73 states have internal predecessors, (79), 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) [2021-12-21 18:18:53,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 85 transitions. [2021-12-21 18:18:53,896 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 85 transitions. Word has length 53 [2021-12-21 18:18:53,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:53,897 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 85 transitions. [2021-12-21 18:18:53,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 18:18:53,897 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 85 transitions. [2021-12-21 18:18:53,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-21 18:18:53,897 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:53,897 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:53,908 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Ended with exit code 0 [2021-12-21 18:18:54,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:54,098 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:54,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:54,098 INFO L85 PathProgramCache]: Analyzing trace with hash -2063364138, now seen corresponding path program 1 times [2021-12-21 18:18:54,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:54,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [933372808] [2021-12-21 18:18:54,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:54,099 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:54,099 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:54,100 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) [2021-12-21 18:18:54,101 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-12-21 18:18:54,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:54,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 66 conjunts are in the unsatisfiable core [2021-12-21 18:18:54,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:54,446 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 [2021-12-21 18:18:54,580 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 [2021-12-21 18:18:54,590 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 [2021-12-21 18:18:54,728 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 9 treesize of output 5 [2021-12-21 18:18:54,750 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 [2021-12-21 18:18:55,156 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 18:18:55,157 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 16 treesize of output 22 [2021-12-21 18:18:55,171 INFO L353 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-21 18:18:55,171 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 16 [2021-12-21 18:18:55,178 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 7 treesize of output 5 [2021-12-21 18:18:55,226 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 18:18:55,227 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 20 [2021-12-21 18:18:55,239 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 [2021-12-21 18:18:55,654 INFO L353 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-12-21 18:18:55,654 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 22 [2021-12-21 18:18:55,684 INFO L353 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-12-21 18:18:55,684 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 20 [2021-12-21 18:18:55,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:55,837 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 23 [2021-12-21 18:18:55,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:55,847 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 25 [2021-12-21 18:18:56,438 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 18:18:56,467 INFO L353 Elim1Store]: treesize reduction 31, result has 8.8 percent of original size [2021-12-21 18:18:56,468 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 43 [2021-12-21 18:18:56,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:56,494 INFO L353 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-21 18:18:56,494 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 18 [2021-12-21 18:18:56,986 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 18:18:56,986 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 18:18:56,987 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-21 18:18:56,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [933372808] [2021-12-21 18:18:56,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [933372808] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 18:18:56,987 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 18:18:56,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-12-21 18:18:56,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802590422] [2021-12-21 18:18:56,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 18:18:56,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-21 18:18:56,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-21 18:18:56,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-21 18:18:56,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=483, Unknown=1, NotChecked=0, Total=552 [2021-12-21 18:18:56,988 INFO L87 Difference]: Start difference. First operand 80 states and 85 transitions. Second operand has 24 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 18:18:57,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 18:18:57,341 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2021-12-21 18:18:57,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 18:18:57,341 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 53 [2021-12-21 18:18:57,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 18:18:57,342 INFO L225 Difference]: With dead ends: 80 [2021-12-21 18:18:57,342 INFO L226 Difference]: Without dead ends: 80 [2021-12-21 18:18:57,342 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=92, Invalid=609, Unknown=1, NotChecked=0, Total=702 [2021-12-21 18:18:57,343 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 14 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 154 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 18:18:57,343 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 359 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 110 Invalid, 0 Unknown, 154 Unchecked, 0.2s Time] [2021-12-21 18:18:57,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-12-21 18:18:57,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-12-21 18:18:57,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 64 states have (on average 1.21875) internal successors, (78), 73 states have internal predecessors, (78), 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) [2021-12-21 18:18:57,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2021-12-21 18:18:57,346 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 53 [2021-12-21 18:18:57,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 18:18:57,346 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2021-12-21 18:18:57,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-21 18:18:57,347 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2021-12-21 18:18:57,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-12-21 18:18:57,347 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 18:18:57,347 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 18:18:57,360 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-12-21 18:18:57,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-21 18:18:57,560 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr25ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 27 more)] === [2021-12-21 18:18:57,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 18:18:57,560 INFO L85 PathProgramCache]: Analyzing trace with hash 460219817, now seen corresponding path program 1 times [2021-12-21 18:18:57,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-21 18:18:57,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [638554393] [2021-12-21 18:18:57,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 18:18:57,561 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-21 18:18:57,561 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-21 18:18:57,562 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) [2021-12-21 18:18:57,562 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-12-21 18:18:57,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 18:18:57,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 43 conjunts are in the unsatisfiable core [2021-12-21 18:18:57,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 18:18:57,978 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 18:18:58,084 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 8 treesize of output 4 [2021-12-21 18:18:58,351 INFO L353 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-12-21 18:18:58,352 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 15 treesize of output 21 [2021-12-21 18:18:58,362 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 6 treesize of output 4 [2021-12-21 18:18:58,645 INFO L353 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-12-21 18:18:58,645 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2021-12-21 18:18:58,760 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 11 treesize of output 7 [2021-12-21 18:18:58,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 18:18:58,773 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 22 [2021-12-21 18:18:58,852 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 [2021-12-21 18:18:59,105 INFO L353 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-21 18:18:59,106 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-12-21 18:18:59,174 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 18:18:59,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 18:18:59,348 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 82 treesize of output 78