./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/in-de61.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de61.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 49b7efdcf8f4d6c873493bd370328870547a88b20d287c5de5342268b0966917 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-22 15:24:52,451 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-22 15:24:52,454 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-22 15:24:52,496 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-22 15:24:52,501 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-22 15:24:52,505 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-22 15:24:52,508 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-22 15:24:52,514 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-22 15:24:52,517 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-22 15:24:52,523 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-22 15:24:52,524 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-22 15:24:52,527 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-22 15:24:52,527 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-22 15:24:52,530 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-22 15:24:52,534 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-22 15:24:52,537 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-22 15:24:52,539 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-22 15:24:52,541 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-22 15:24:52,546 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-22 15:24:52,555 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-22 15:24:52,558 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-22 15:24:52,559 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-22 15:24:52,563 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-22 15:24:52,564 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-22 15:24:52,575 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-22 15:24:52,575 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-22 15:24:52,576 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-22 15:24:52,578 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-22 15:24:52,579 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-22 15:24:52,581 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-22 15:24:52,582 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-22 15:24:52,583 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-22 15:24:52,586 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-22 15:24:52,587 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-22 15:24:52,589 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-22 15:24:52,590 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-22 15:24:52,591 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-22 15:24:52,591 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-22 15:24:52,591 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-22 15:24:52,592 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-22 15:24:52,593 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-22 15:24:52,594 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-22 15:24:52,648 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-22 15:24:52,648 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-22 15:24:52,649 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-22 15:24:52,649 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-22 15:24:52,650 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-22 15:24:52,651 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-22 15:24:52,651 INFO L138 SettingsManager]: * Use SBE=true [2021-11-22 15:24:52,651 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-22 15:24:52,651 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-22 15:24:52,651 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-22 15:24:52,652 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-22 15:24:52,652 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-22 15:24:52,652 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-22 15:24:52,652 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-22 15:24:52,652 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-22 15:24:52,653 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-22 15:24:52,653 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-22 15:24:52,653 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-22 15:24:52,653 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-22 15:24:52,654 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-22 15:24:52,654 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-22 15:24:52,654 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-22 15:24:52,654 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 15:24:52,654 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-22 15:24:52,655 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-22 15:24:52,655 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-22 15:24:52,655 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-22 15:24:52,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-22 15:24:52,655 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-22 15:24:52,655 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-22 15:24:52,656 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-22 15:24:52,656 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-22 15:24:52,656 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 49b7efdcf8f4d6c873493bd370328870547a88b20d287c5de5342268b0966917 [2021-11-22 15:24:52,987 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-22 15:24:53,012 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-22 15:24:53,016 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-22 15:24:53,017 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-22 15:24:53,018 INFO L275 PluginConnector]: CDTParser initialized [2021-11-22 15:24:53,020 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/../../sv-benchmarks/c/loops-crafted-1/in-de61.c [2021-11-22 15:24:53,118 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/data/c6ffefcc6/a4f9b3f1dd9d4518beb8536426633d63/FLAG41bbccc9b [2021-11-22 15:24:53,648 INFO L306 CDTParser]: Found 1 translation units. [2021-11-22 15:24:53,649 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/sv-benchmarks/c/loops-crafted-1/in-de61.c [2021-11-22 15:24:53,662 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/data/c6ffefcc6/a4f9b3f1dd9d4518beb8536426633d63/FLAG41bbccc9b [2021-11-22 15:24:53,996 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/data/c6ffefcc6/a4f9b3f1dd9d4518beb8536426633d63 [2021-11-22 15:24:53,999 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-22 15:24:54,001 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-22 15:24:54,006 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-22 15:24:54,007 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-22 15:24:54,011 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-22 15:24:54,012 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 03:24:53" (1/1) ... [2021-11-22 15:24:54,015 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44bcff97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54, skipping insertion in model container [2021-11-22 15:24:54,015 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 03:24:53" (1/1) ... [2021-11-22 15:24:54,025 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-22 15:24:54,042 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-22 15:24:54,313 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/sv-benchmarks/c/loops-crafted-1/in-de61.c[368,381] [2021-11-22 15:24:54,332 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 15:24:54,342 INFO L203 MainTranslator]: Completed pre-run [2021-11-22 15:24:54,356 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/sv-benchmarks/c/loops-crafted-1/in-de61.c[368,381] [2021-11-22 15:24:54,363 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 15:24:54,379 INFO L208 MainTranslator]: Completed translation [2021-11-22 15:24:54,380 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54 WrapperNode [2021-11-22 15:24:54,380 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-22 15:24:54,382 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-22 15:24:54,382 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-22 15:24:54,382 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-22 15:24:54,391 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,399 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,422 INFO L137 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 85 [2021-11-22 15:24:54,422 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-22 15:24:54,423 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-22 15:24:54,424 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-22 15:24:54,424 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-22 15:24:54,434 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,434 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,436 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,436 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,441 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,446 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,448 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,460 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-22 15:24:54,462 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-22 15:24:54,462 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-22 15:24:54,462 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-22 15:24:54,463 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (1/1) ... [2021-11-22 15:24:54,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 15:24:54,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:24:54,511 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-22 15:24:54,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-22 15:24:54,569 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-22 15:24:54,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-22 15:24:54,570 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-22 15:24:54,570 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-22 15:24:54,651 INFO L236 CfgBuilder]: Building ICFG [2021-11-22 15:24:54,653 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-22 15:24:54,848 INFO L277 CfgBuilder]: Performing block encoding [2021-11-22 15:24:54,854 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-22 15:24:54,854 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-22 15:24:54,856 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 03:24:54 BoogieIcfgContainer [2021-11-22 15:24:54,856 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-22 15:24:54,858 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-22 15:24:54,858 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-22 15:24:54,862 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-22 15:24:54,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 03:24:53" (1/3) ... [2021-11-22 15:24:54,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1230733e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 03:24:54, skipping insertion in model container [2021-11-22 15:24:54,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:24:54" (2/3) ... [2021-11-22 15:24:54,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1230733e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 03:24:54, skipping insertion in model container [2021-11-22 15:24:54,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 03:24:54" (3/3) ... [2021-11-22 15:24:54,866 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de61.c [2021-11-22 15:24:54,872 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-22 15:24:54,873 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-22 15:24:54,927 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-22 15:24:54,936 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-22 15:24:54,937 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-22 15:24:54,953 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:54,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-22 15:24:54,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:24:54,974 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:24:54,975 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:24:54,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:24:54,981 INFO L85 PathProgramCache]: Analyzing trace with hash 1928996963, now seen corresponding path program 1 times [2021-11-22 15:24:54,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:24:55,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359191258] [2021-11-22 15:24:55,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:24:55,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:24:55,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:24:55,226 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:55,227 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:24:55,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359191258] [2021-11-22 15:24:55,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359191258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-22 15:24:55,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-22 15:24:55,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-22 15:24:55,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944667739] [2021-11-22 15:24:55,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-22 15:24:55,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-22 15:24:55,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:24:55,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-22 15:24:55,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 15:24:55,279 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:55,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:24:55,303 INFO L93 Difference]: Finished difference Result 31 states and 53 transitions. [2021-11-22 15:24:55,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-22 15:24:55,305 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-22 15:24:55,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:24:55,314 INFO L225 Difference]: With dead ends: 31 [2021-11-22 15:24:55,315 INFO L226 Difference]: Without dead ends: 13 [2021-11-22 15:24:55,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 15:24:55,325 INFO L933 BasicCegarLoop]: 22 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, 22 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:24:55,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 15:24:55,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-22 15:24:55,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-22 15:24:55,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:55,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 18 transitions. [2021-11-22 15:24:55,386 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 18 transitions. Word has length 12 [2021-11-22 15:24:55,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:24:55,387 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 18 transitions. [2021-11-22 15:24:55,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:55,388 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 18 transitions. [2021-11-22 15:24:55,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-22 15:24:55,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:24:55,389 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:24:55,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-22 15:24:55,391 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:24:55,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:24:55,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1814480359, now seen corresponding path program 1 times [2021-11-22 15:24:55,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:24:55,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64100378] [2021-11-22 15:24:55,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:24:55,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:24:55,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:24:55,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:55,939 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:24:55,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64100378] [2021-11-22 15:24:55,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64100378] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-22 15:24:55,940 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-22 15:24:55,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-22 15:24:55,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320296655] [2021-11-22 15:24:55,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-22 15:24:55,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-22 15:24:55,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:24:55,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-22 15:24:55,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-22 15:24:55,945 INFO L87 Difference]: Start difference. First operand 13 states and 18 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:56,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:24:56,159 INFO L93 Difference]: Finished difference Result 31 states and 46 transitions. [2021-11-22 15:24:56,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-22 15:24:56,160 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-22 15:24:56,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:24:56,161 INFO L225 Difference]: With dead ends: 31 [2021-11-22 15:24:56,161 INFO L226 Difference]: Without dead ends: 14 [2021-11-22 15:24:56,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-22 15:24:56,164 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 21 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:24:56,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 34 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:24:56,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-22 15:24:56,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-22 15:24:56,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:56,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2021-11-22 15:24:56,170 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 12 [2021-11-22 15:24:56,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:24:56,170 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2021-11-22 15:24:56,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:56,171 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2021-11-22 15:24:56,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-22 15:24:56,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:24:56,172 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:24:56,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-22 15:24:56,172 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:24:56,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:24:56,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1427170164, now seen corresponding path program 1 times [2021-11-22 15:24:56,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:24:56,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068300971] [2021-11-22 15:24:56,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:24:56,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:24:56,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:24:56,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:56,267 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:24:56,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068300971] [2021-11-22 15:24:56,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068300971] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:24:56,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505811727] [2021-11-22 15:24:56,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:24:56,269 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:24:56,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:24:56,293 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:24:56,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-22 15:24:56,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:24:56,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-22 15:24:56,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:24:56,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:56,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:24:56,617 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:56,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505811727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:24:56,618 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:24:56,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-22 15:24:56,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696101675] [2021-11-22 15:24:56,625 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:24:56,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-22 15:24:56,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:24:56,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-22 15:24:56,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-22 15:24:56,633 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:56,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:24:56,900 INFO L93 Difference]: Finished difference Result 58 states and 94 transitions. [2021-11-22 15:24:56,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-22 15:24:56,901 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-22 15:24:56,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:24:56,903 INFO L225 Difference]: With dead ends: 58 [2021-11-22 15:24:56,903 INFO L226 Difference]: Without dead ends: 50 [2021-11-22 15:24:56,904 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-11-22 15:24:56,906 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 45 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:24:56,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 55 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 15:24:56,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-22 15:24:56,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 37. [2021-11-22 15:24:56,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 36 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:56,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 55 transitions. [2021-11-22 15:24:56,917 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 55 transitions. Word has length 13 [2021-11-22 15:24:56,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:24:56,917 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 55 transitions. [2021-11-22 15:24:56,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:56,918 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 55 transitions. [2021-11-22 15:24:56,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 15:24:56,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:24:56,919 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:24:56,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-22 15:24:57,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:24:57,129 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:24:57,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:24:57,130 INFO L85 PathProgramCache]: Analyzing trace with hash -603304611, now seen corresponding path program 1 times [2021-11-22 15:24:57,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:24:57,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886456344] [2021-11-22 15:24:57,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:24:57,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:24:57,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:24:57,289 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:57,290 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:24:57,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886456344] [2021-11-22 15:24:57,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886456344] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:24:57,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904459682] [2021-11-22 15:24:57,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:24:57,291 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:24:57,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:24:57,298 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:24:57,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-22 15:24:57,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:24:57,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-22 15:24:57,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:24:57,431 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:24:57,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:24:57,488 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:24:57,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904459682] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:24:57,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:24:57,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 9 [2021-11-22 15:24:57,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494980066] [2021-11-22 15:24:57,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:24:57,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-22 15:24:57,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:24:57,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-22 15:24:57,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-22 15:24:57,502 INFO L87 Difference]: Start difference. First operand 37 states and 55 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:57,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:24:57,848 INFO L93 Difference]: Finished difference Result 107 states and 151 transitions. [2021-11-22 15:24:57,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-22 15:24:57,849 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-22 15:24:57,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:24:57,850 INFO L225 Difference]: With dead ends: 107 [2021-11-22 15:24:57,850 INFO L226 Difference]: Without dead ends: 87 [2021-11-22 15:24:57,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-22 15:24:57,852 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 48 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:24:57,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 107 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:24:57,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-22 15:24:57,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 49. [2021-11-22 15:24:57,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.4375) internal successors, (69), 48 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:57,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 69 transitions. [2021-11-22 15:24:57,869 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 69 transitions. Word has length 15 [2021-11-22 15:24:57,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:24:57,870 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 69 transitions. [2021-11-22 15:24:57,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:57,870 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 69 transitions. [2021-11-22 15:24:57,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-22 15:24:57,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:24:57,873 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:24:57,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-22 15:24:58,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:24:58,093 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:24:58,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:24:58,094 INFO L85 PathProgramCache]: Analyzing trace with hash 114935591, now seen corresponding path program 2 times [2021-11-22 15:24:58,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:24:58,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744065597] [2021-11-22 15:24:58,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:24:58,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:24:58,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:24:58,218 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:58,219 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:24:58,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744065597] [2021-11-22 15:24:58,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744065597] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:24:58,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190252841] [2021-11-22 15:24:58,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:24:58,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:24:58,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:24:58,223 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:24:58,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-22 15:24:58,275 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:24:58,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:24:58,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-22 15:24:58,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:24:58,390 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:58,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:24:58,538 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:24:58,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190252841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:24:58,539 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:24:58,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2021-11-22 15:24:58,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571714102] [2021-11-22 15:24:58,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:24:58,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-22 15:24:58,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:24:58,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-22 15:24:58,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-22 15:24:58,541 INFO L87 Difference]: Start difference. First operand 49 states and 69 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:59,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:24:59,790 INFO L93 Difference]: Finished difference Result 188 states and 307 transitions. [2021-11-22 15:24:59,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-22 15:24:59,791 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-22 15:24:59,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:24:59,793 INFO L225 Difference]: With dead ends: 188 [2021-11-22 15:24:59,793 INFO L226 Difference]: Without dead ends: 174 [2021-11-22 15:24:59,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=301, Invalid=691, Unknown=0, NotChecked=0, Total=992 [2021-11-22 15:24:59,796 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 264 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-22 15:24:59,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [264 Valid, 169 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-22 15:24:59,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-22 15:24:59,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 106. [2021-11-22 15:24:59,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.4952380952380953) internal successors, (157), 105 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:59,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 157 transitions. [2021-11-22 15:24:59,825 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 157 transitions. Word has length 16 [2021-11-22 15:24:59,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:24:59,826 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 157 transitions. [2021-11-22 15:24:59,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:24:59,827 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 157 transitions. [2021-11-22 15:24:59,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-22 15:24:59,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:24:59,830 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:24:59,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:00,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:00,058 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:00,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:00,058 INFO L85 PathProgramCache]: Analyzing trace with hash 188466470, now seen corresponding path program 1 times [2021-11-22 15:25:00,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:00,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441538992] [2021-11-22 15:25:00,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:00,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:00,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:00,520 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:25:00,520 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:00,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441538992] [2021-11-22 15:25:00,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1441538992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:00,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098926676] [2021-11-22 15:25:00,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:00,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:00,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:00,522 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:00,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-22 15:25:00,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:00,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-22 15:25:00,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:01,074 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:25:01,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:01,574 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:25:01,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2098926676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:01,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:01,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 9] total 22 [2021-11-22 15:25:01,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838099870] [2021-11-22 15:25:01,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:01,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-22 15:25:01,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:01,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-22 15:25:01,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2021-11-22 15:25:01,578 INFO L87 Difference]: Start difference. First operand 106 states and 157 transitions. Second operand has 22 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 22 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:04,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:04,934 INFO L93 Difference]: Finished difference Result 212 states and 300 transitions. [2021-11-22 15:25:04,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-22 15:25:04,935 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 22 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-22 15:25:04,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:04,936 INFO L225 Difference]: With dead ends: 212 [2021-11-22 15:25:04,936 INFO L226 Difference]: Without dead ends: 200 [2021-11-22 15:25:04,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 633 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=444, Invalid=1812, Unknown=0, NotChecked=0, Total=2256 [2021-11-22 15:25:04,939 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 107 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:04,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 108 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-22 15:25:04,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-22 15:25:04,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 119. [2021-11-22 15:25:04,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.5423728813559323) internal successors, (182), 118 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:04,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 182 transitions. [2021-11-22 15:25:04,970 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 182 transitions. Word has length 18 [2021-11-22 15:25:04,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:04,971 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 182 transitions. [2021-11-22 15:25:04,971 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1363636363636362) internal successors, (47), 22 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:04,971 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 182 transitions. [2021-11-22 15:25:04,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-22 15:25:04,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:04,979 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:05,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:05,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:05,196 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:05,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:05,196 INFO L85 PathProgramCache]: Analyzing trace with hash 748617255, now seen corresponding path program 2 times [2021-11-22 15:25:05,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:05,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926640326] [2021-11-22 15:25:05,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:05,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:05,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:05,364 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:25:05,364 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:05,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926640326] [2021-11-22 15:25:05,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926640326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:05,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49492701] [2021-11-22 15:25:05,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:25:05,366 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:05,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:05,368 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:05,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-22 15:25:05,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:25:05,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:25:05,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 15:25:05,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:05,509 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 15:25:05,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:05,566 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 15:25:05,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49492701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:05,567 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:05,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5] total 12 [2021-11-22 15:25:05,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998714204] [2021-11-22 15:25:05,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:05,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-22 15:25:05,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:05,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-22 15:25:05,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-22 15:25:05,569 INFO L87 Difference]: Start difference. First operand 119 states and 182 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:06,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:06,439 INFO L93 Difference]: Finished difference Result 341 states and 489 transitions. [2021-11-22 15:25:06,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-22 15:25:06,439 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-22 15:25:06,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:06,441 INFO L225 Difference]: With dead ends: 341 [2021-11-22 15:25:06,441 INFO L226 Difference]: Without dead ends: 301 [2021-11-22 15:25:06,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=253, Invalid=1553, Unknown=0, NotChecked=0, Total=1806 [2021-11-22 15:25:06,444 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 168 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:06,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 122 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 15:25:06,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-11-22 15:25:06,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 150. [2021-11-22 15:25:06,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 149 states have (on average 1.5100671140939597) internal successors, (225), 149 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:06,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 225 transitions. [2021-11-22 15:25:06,470 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 225 transitions. Word has length 18 [2021-11-22 15:25:06,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:06,471 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 225 transitions. [2021-11-22 15:25:06,471 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:06,472 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 225 transitions. [2021-11-22 15:25:06,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-22 15:25:06,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:06,474 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:06,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:06,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-22 15:25:06,698 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:06,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:06,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1346970424, now seen corresponding path program 2 times [2021-11-22 15:25:06,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:06,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016273503] [2021-11-22 15:25:06,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:06,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:06,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:06,783 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-22 15:25:06,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:06,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016273503] [2021-11-22 15:25:06,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016273503] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:06,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622168995] [2021-11-22 15:25:06,785 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:25:06,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:06,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:06,801 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:06,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-22 15:25:06,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:25:06,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:25:06,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-22 15:25:06,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:06,914 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-22 15:25:06,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:06,965 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-22 15:25:06,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622168995] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:06,966 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:06,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2021-11-22 15:25:06,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999969365] [2021-11-22 15:25:06,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:06,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-22 15:25:06,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:06,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-22 15:25:06,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-22 15:25:06,968 INFO L87 Difference]: Start difference. First operand 150 states and 225 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:07,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:07,005 INFO L93 Difference]: Finished difference Result 245 states and 367 transitions. [2021-11-22 15:25:07,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-22 15:25:07,006 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-22 15:25:07,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:07,008 INFO L225 Difference]: With dead ends: 245 [2021-11-22 15:25:07,012 INFO L226 Difference]: Without dead ends: 183 [2021-11-22 15:25:07,013 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-22 15:25:07,014 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 15 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:07,015 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 54 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 15:25:07,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-22 15:25:07,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 147. [2021-11-22 15:25:07,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.4794520547945205) internal successors, (216), 146 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:07,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 216 transitions. [2021-11-22 15:25:07,049 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 216 transitions. Word has length 20 [2021-11-22 15:25:07,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:07,050 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 216 transitions. [2021-11-22 15:25:07,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:07,050 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 216 transitions. [2021-11-22 15:25:07,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-22 15:25:07,051 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:07,051 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:07,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:07,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-22 15:25:07,277 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:07,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:07,278 INFO L85 PathProgramCache]: Analyzing trace with hash 48319293, now seen corresponding path program 1 times [2021-11-22 15:25:07,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:07,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963036009] [2021-11-22 15:25:07,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:07,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:07,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:07,375 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-22 15:25:07,375 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:07,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963036009] [2021-11-22 15:25:07,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963036009] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:07,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392022019] [2021-11-22 15:25:07,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:07,376 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:07,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:07,377 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:07,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-22 15:25:07,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:07,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-22 15:25:07,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:07,509 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-22 15:25:07,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:07,609 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-22 15:25:07,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392022019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:07,610 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:07,610 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 6] total 14 [2021-11-22 15:25:07,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992406082] [2021-11-22 15:25:07,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:07,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-22 15:25:07,611 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:07,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-22 15:25:07,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-22 15:25:07,612 INFO L87 Difference]: Start difference. First operand 147 states and 216 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:08,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:08,025 INFO L93 Difference]: Finished difference Result 235 states and 339 transitions. [2021-11-22 15:25:08,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-22 15:25:08,026 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-22 15:25:08,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:08,028 INFO L225 Difference]: With dead ends: 235 [2021-11-22 15:25:08,028 INFO L226 Difference]: Without dead ends: 186 [2021-11-22 15:25:08,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-11-22 15:25:08,030 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 52 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:08,030 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 144 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:25:08,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-11-22 15:25:08,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 143. [2021-11-22 15:25:08,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.4859154929577465) internal successors, (211), 142 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:08,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 211 transitions. [2021-11-22 15:25:08,044 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 211 transitions. Word has length 21 [2021-11-22 15:25:08,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:08,044 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 211 transitions. [2021-11-22 15:25:08,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:08,045 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 211 transitions. [2021-11-22 15:25:08,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-22 15:25:08,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:08,046 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:08,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:08,262 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:08,262 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:08,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:08,263 INFO L85 PathProgramCache]: Analyzing trace with hash 1411583389, now seen corresponding path program 3 times [2021-11-22 15:25:08,263 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:08,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500129926] [2021-11-22 15:25:08,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:08,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:08,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:08,443 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:25:08,443 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:08,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500129926] [2021-11-22 15:25:08,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500129926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:08,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866138192] [2021-11-22 15:25:08,444 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:25:08,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:08,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:08,445 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:08,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-22 15:25:08,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-22 15:25:08,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:25:08,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-22 15:25:08,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:08,615 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-22 15:25:08,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:08,674 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-22 15:25:08,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866138192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:08,675 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:08,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 15 [2021-11-22 15:25:08,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729729978] [2021-11-22 15:25:08,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:08,677 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-22 15:25:08,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:08,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-22 15:25:08,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-11-22 15:25:08,678 INFO L87 Difference]: Start difference. First operand 143 states and 211 transitions. Second operand has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:10,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:10,798 INFO L93 Difference]: Finished difference Result 414 states and 573 transitions. [2021-11-22 15:25:10,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-22 15:25:10,799 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-22 15:25:10,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:10,805 INFO L225 Difference]: With dead ends: 414 [2021-11-22 15:25:10,805 INFO L226 Difference]: Without dead ends: 378 [2021-11-22 15:25:10,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1511 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=524, Invalid=4446, Unknown=0, NotChecked=0, Total=4970 [2021-11-22 15:25:10,812 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 233 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 782 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 949 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:10,815 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 248 Invalid, 949 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 782 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-22 15:25:10,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2021-11-22 15:25:10,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 167. [2021-11-22 15:25:10,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.4879518072289157) internal successors, (247), 166 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:10,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 247 transitions. [2021-11-22 15:25:10,831 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 247 transitions. Word has length 21 [2021-11-22 15:25:10,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:10,833 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 247 transitions. [2021-11-22 15:25:10,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:10,834 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 247 transitions. [2021-11-22 15:25:10,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-22 15:25:10,835 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:10,835 INFO L514 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:10,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:11,050 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-22 15:25:11,050 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:11,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:11,051 INFO L85 PathProgramCache]: Analyzing trace with hash -1195101891, now seen corresponding path program 2 times [2021-11-22 15:25:11,051 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:11,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865308847] [2021-11-22 15:25:11,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:11,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:11,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:11,216 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 15:25:11,216 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:11,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865308847] [2021-11-22 15:25:11,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865308847] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:11,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730316265] [2021-11-22 15:25:11,217 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:25:11,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:11,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:11,222 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:11,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-22 15:25:11,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:25:11,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:25:11,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-22 15:25:11,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:11,375 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:25:11,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:11,531 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:25:11,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730316265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:11,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:11,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 16 [2021-11-22 15:25:11,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741662556] [2021-11-22 15:25:11,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:11,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-22 15:25:11,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:11,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-22 15:25:11,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2021-11-22 15:25:11,533 INFO L87 Difference]: Start difference. First operand 167 states and 247 transitions. Second operand has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:12,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:12,820 INFO L93 Difference]: Finished difference Result 411 states and 641 transitions. [2021-11-22 15:25:12,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-22 15:25:12,820 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-22 15:25:12,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:12,823 INFO L225 Difference]: With dead ends: 411 [2021-11-22 15:25:12,823 INFO L226 Difference]: Without dead ends: 357 [2021-11-22 15:25:12,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=317, Invalid=675, Unknown=0, NotChecked=0, Total=992 [2021-11-22 15:25:12,825 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 301 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:12,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [301 Valid, 231 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-22 15:25:12,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2021-11-22 15:25:12,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 208. [2021-11-22 15:25:12,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 207 states have (on average 1.4830917874396135) internal successors, (307), 207 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:12,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 307 transitions. [2021-11-22 15:25:12,843 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 307 transitions. Word has length 21 [2021-11-22 15:25:12,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:12,844 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 307 transitions. [2021-11-22 15:25:12,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 16 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:12,844 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 307 transitions. [2021-11-22 15:25:12,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-22 15:25:12,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:12,846 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:12,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:13,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:13,065 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:13,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:13,066 INFO L85 PathProgramCache]: Analyzing trace with hash 1372519271, now seen corresponding path program 3 times [2021-11-22 15:25:13,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:13,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369685963] [2021-11-22 15:25:13,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:13,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:13,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:13,173 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-22 15:25:13,173 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:13,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369685963] [2021-11-22 15:25:13,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369685963] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:13,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568431579] [2021-11-22 15:25:13,175 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:25:13,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:13,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:13,178 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:13,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-22 15:25:13,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-22 15:25:13,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:25:13,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 15:25:13,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:13,308 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-22 15:25:13,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:13,372 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-22 15:25:13,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568431579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:13,373 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:13,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 5 [2021-11-22 15:25:13,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916521923] [2021-11-22 15:25:13,373 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:13,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-22 15:25:13,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:13,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-22 15:25:13,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-22 15:25:13,375 INFO L87 Difference]: Start difference. First operand 208 states and 307 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:13,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:13,458 INFO L93 Difference]: Finished difference Result 327 states and 463 transitions. [2021-11-22 15:25:13,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-22 15:25:13,459 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-22 15:25:13,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:13,462 INFO L225 Difference]: With dead ends: 327 [2021-11-22 15:25:13,462 INFO L226 Difference]: Without dead ends: 315 [2021-11-22 15:25:13,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-22 15:25:13,463 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 30 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:13,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 77 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 15:25:13,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-11-22 15:25:13,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 225. [2021-11-22 15:25:13,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.4553571428571428) internal successors, (326), 224 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:13,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 326 transitions. [2021-11-22 15:25:13,483 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 326 transitions. Word has length 22 [2021-11-22 15:25:13,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:13,483 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 326 transitions. [2021-11-22 15:25:13,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 5 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:13,484 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 326 transitions. [2021-11-22 15:25:13,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-22 15:25:13,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:13,486 INFO L514 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:13,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:13,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:13,702 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:13,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:13,702 INFO L85 PathProgramCache]: Analyzing trace with hash -677222036, now seen corresponding path program 3 times [2021-11-22 15:25:13,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:13,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380666643] [2021-11-22 15:25:13,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:13,703 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:13,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:13,908 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:25:13,908 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:13,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380666643] [2021-11-22 15:25:13,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [380666643] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:13,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762789326] [2021-11-22 15:25:13,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:25:13,909 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:13,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:13,910 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:13,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-22 15:25:14,037 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-22 15:25:14,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:25:14,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-22 15:25:14,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:14,141 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:25:14,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:14,483 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:25:14,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762789326] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:14,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:14,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 27 [2021-11-22 15:25:14,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806143126] [2021-11-22 15:25:14,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:14,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-22 15:25:14,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:14,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-22 15:25:14,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2021-11-22 15:25:14,487 INFO L87 Difference]: Start difference. First operand 225 states and 326 transitions. Second operand has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:34,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:34,062 INFO L93 Difference]: Finished difference Result 804 states and 1289 transitions. [2021-11-22 15:25:34,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-22 15:25:34,063 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-22 15:25:34,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:34,069 INFO L225 Difference]: With dead ends: 804 [2021-11-22 15:25:34,069 INFO L226 Difference]: Without dead ends: 755 [2021-11-22 15:25:34,072 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=811, Invalid=1541, Unknown=0, NotChecked=0, Total=2352 [2021-11-22 15:25:34,073 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 1050 mSDsluCounter, 817 mSDsCounter, 0 mSdLazyCounter, 849 mSolverCounterSat, 684 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1050 SdHoareTripleChecker+Valid, 887 SdHoareTripleChecker+Invalid, 1533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 684 IncrementalHoareTripleChecker+Valid, 849 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:34,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1050 Valid, 887 Invalid, 1533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [684 Valid, 849 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2021-11-22 15:25:34,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-22 15:25:34,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 366. [2021-11-22 15:25:34,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 365 states have (on average 1.4931506849315068) internal successors, (545), 365 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:34,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 545 transitions. [2021-11-22 15:25:34,108 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 545 transitions. Word has length 23 [2021-11-22 15:25:34,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:34,109 INFO L470 AbstractCegarLoop]: Abstraction has 366 states and 545 transitions. [2021-11-22 15:25:34,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:34,110 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 545 transitions. [2021-11-22 15:25:34,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-22 15:25:34,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:34,113 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:34,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:34,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:34,321 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:34,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:34,322 INFO L85 PathProgramCache]: Analyzing trace with hash -11866489, now seen corresponding path program 4 times [2021-11-22 15:25:34,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:34,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361180473] [2021-11-22 15:25:34,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:34,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:34,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:34,755 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 15:25:34,755 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:34,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361180473] [2021-11-22 15:25:34,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361180473] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:34,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910341685] [2021-11-22 15:25:34,756 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 15:25:34,756 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:34,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:34,758 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:34,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-22 15:25:34,839 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 15:25:34,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:25:34,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-22 15:25:34,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:35,455 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:25:35,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:35,922 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 15:25:35,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910341685] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:35,923 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:35,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 10] total 30 [2021-11-22 15:25:35,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331405072] [2021-11-22 15:25:35,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:35,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-22 15:25:35,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:35,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-22 15:25:35,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2021-11-22 15:25:35,926 INFO L87 Difference]: Start difference. First operand 366 states and 545 transitions. Second operand has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 30 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:37,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:37,211 INFO L93 Difference]: Finished difference Result 473 states and 667 transitions. [2021-11-22 15:25:37,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-22 15:25:37,212 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 30 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-22 15:25:37,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:37,215 INFO L225 Difference]: With dead ends: 473 [2021-11-22 15:25:37,215 INFO L226 Difference]: Without dead ends: 382 [2021-11-22 15:25:37,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=316, Invalid=1754, Unknown=0, NotChecked=0, Total=2070 [2021-11-22 15:25:37,217 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 58 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 430 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 430 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:37,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 69 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 430 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-22 15:25:37,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-11-22 15:25:37,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 334. [2021-11-22 15:25:37,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 1.4684684684684686) internal successors, (489), 333 states have internal predecessors, (489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:37,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 489 transitions. [2021-11-22 15:25:37,247 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 489 transitions. Word has length 24 [2021-11-22 15:25:37,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:37,248 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 489 transitions. [2021-11-22 15:25:37,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 30 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:37,249 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 489 transitions. [2021-11-22 15:25:37,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-22 15:25:37,250 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:37,250 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:37,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:37,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-22 15:25:37,465 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:37,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:37,466 INFO L85 PathProgramCache]: Analyzing trace with hash -147642777, now seen corresponding path program 4 times [2021-11-22 15:25:37,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:37,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051829443] [2021-11-22 15:25:37,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:37,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:37,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:37,683 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:25:37,683 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:37,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051829443] [2021-11-22 15:25:37,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051829443] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:37,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475844625] [2021-11-22 15:25:37,684 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 15:25:37,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:37,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:37,686 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:37,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-22 15:25:37,750 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 15:25:37,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:25:37,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-22 15:25:37,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:37,921 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-22 15:25:37,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:37,988 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-22 15:25:37,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475844625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:37,989 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:37,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7, 7] total 18 [2021-11-22 15:25:37,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689896480] [2021-11-22 15:25:37,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:37,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-22 15:25:37,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:37,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-22 15:25:37,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-11-22 15:25:37,991 INFO L87 Difference]: Start difference. First operand 334 states and 489 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:42,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:25:42,732 INFO L93 Difference]: Finished difference Result 922 states and 1301 transitions. [2021-11-22 15:25:42,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-22 15:25:42,733 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-22 15:25:42,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:25:42,739 INFO L225 Difference]: With dead ends: 922 [2021-11-22 15:25:42,739 INFO L226 Difference]: Without dead ends: 844 [2021-11-22 15:25:42,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3704 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=926, Invalid=9994, Unknown=0, NotChecked=0, Total=10920 [2021-11-22 15:25:42,745 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 341 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 1225 mSolverCounterSat, 319 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 1544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 319 IncrementalHoareTripleChecker+Valid, 1225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-22 15:25:42,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [341 Valid, 328 Invalid, 1544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [319 Valid, 1225 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-22 15:25:42,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 844 states. [2021-11-22 15:25:42,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 844 to 386. [2021-11-22 15:25:42,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 386 states, 385 states have (on average 1.483116883116883) internal successors, (571), 385 states have internal predecessors, (571), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:42,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 571 transitions. [2021-11-22 15:25:42,785 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 571 transitions. Word has length 24 [2021-11-22 15:25:42,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:25:42,786 INFO L470 AbstractCegarLoop]: Abstraction has 386 states and 571 transitions. [2021-11-22 15:25:42,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:25:42,786 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 571 transitions. [2021-11-22 15:25:42,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-22 15:25:42,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:25:42,788 INFO L514 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:25:42,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-22 15:25:43,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-22 15:25:43,013 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:25:43,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:25:43,014 INFO L85 PathProgramCache]: Analyzing trace with hash -1534066082, now seen corresponding path program 1 times [2021-11-22 15:25:43,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:25:43,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680468411] [2021-11-22 15:25:43,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:43,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:25:43,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:43,238 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:25:43,238 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:25:43,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680468411] [2021-11-22 15:25:43,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680468411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:25:43,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335546738] [2021-11-22 15:25:43,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:25:43,239 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:25:43,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:25:43,240 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:25:43,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-22 15:25:43,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:25:43,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-22 15:25:43,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:25:43,435 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:25:43,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:25:43,975 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:25:43,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335546738] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:25:43,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:25:43,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2021-11-22 15:25:43,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70892362] [2021-11-22 15:25:43,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:25:43,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-22 15:25:43,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:25:43,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-22 15:25:43,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=700, Unknown=0, NotChecked=0, Total=930 [2021-11-22 15:25:43,977 INFO L87 Difference]: Start difference. First operand 386 states and 571 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:26:40,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:26:40,508 INFO L93 Difference]: Finished difference Result 937 states and 1459 transitions. [2021-11-22 15:26:40,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-22 15:26:40,508 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-22 15:26:40,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:26:40,514 INFO L225 Difference]: With dead ends: 937 [2021-11-22 15:26:40,514 INFO L226 Difference]: Without dead ends: 859 [2021-11-22 15:26:40,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1511 ImplicationChecksByTransitivity, 53.2s TimeCoverageRelationStatistics Valid=1855, Invalid=4151, Unknown=0, NotChecked=0, Total=6006 [2021-11-22 15:26:40,518 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 1399 mSDsluCounter, 783 mSDsCounter, 0 mSdLazyCounter, 1083 mSolverCounterSat, 1004 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1399 SdHoareTripleChecker+Valid, 847 SdHoareTripleChecker+Invalid, 2087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1004 IncrementalHoareTripleChecker+Valid, 1083 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-22 15:26:40,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1399 Valid, 847 Invalid, 2087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1004 Valid, 1083 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2021-11-22 15:26:40,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 859 states. [2021-11-22 15:26:40,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 859 to 400. [2021-11-22 15:26:40,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 399 states have (on average 1.4962406015037595) internal successors, (597), 399 states have internal predecessors, (597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:26:40,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 597 transitions. [2021-11-22 15:26:40,563 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 597 transitions. Word has length 25 [2021-11-22 15:26:40,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:26:40,563 INFO L470 AbstractCegarLoop]: Abstraction has 400 states and 597 transitions. [2021-11-22 15:26:40,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:26:40,564 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 597 transitions. [2021-11-22 15:26:40,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-22 15:26:40,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:26:40,568 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:26:40,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-22 15:26:40,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-22 15:26:40,781 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:26:40,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:26:40,782 INFO L85 PathProgramCache]: Analyzing trace with hash -1999602746, now seen corresponding path program 5 times [2021-11-22 15:26:40,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:26:40,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091565736] [2021-11-22 15:26:40,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:26:40,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:26:40,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:26:40,932 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-22 15:26:40,932 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:26:40,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091565736] [2021-11-22 15:26:40,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091565736] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:26:40,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019365959] [2021-11-22 15:26:40,933 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 15:26:40,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:26:40,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:26:40,935 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:26:40,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-22 15:26:41,011 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-11-22 15:26:41,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:26:41,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-22 15:26:41,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:26:41,133 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-22 15:26:41,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:26:41,228 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-22 15:26:41,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019365959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:26:41,228 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:26:41,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 12 [2021-11-22 15:26:41,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871976940] [2021-11-22 15:26:41,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:26:41,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-22 15:26:41,229 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:26:41,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-22 15:26:41,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-22 15:26:41,230 INFO L87 Difference]: Start difference. First operand 400 states and 597 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:26:41,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:26:41,477 INFO L93 Difference]: Finished difference Result 678 states and 973 transitions. [2021-11-22 15:26:41,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-22 15:26:41,478 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-22 15:26:41,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:26:41,483 INFO L225 Difference]: With dead ends: 678 [2021-11-22 15:26:41,484 INFO L226 Difference]: Without dead ends: 654 [2021-11-22 15:26:41,485 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2021-11-22 15:26:41,486 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 84 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:26:41,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 192 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:26:41,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-11-22 15:26:41,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 401. [2021-11-22 15:26:41,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 400 states have (on average 1.4875) internal successors, (595), 400 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:26:41,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 595 transitions. [2021-11-22 15:26:41,550 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 595 transitions. Word has length 26 [2021-11-22 15:26:41,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:26:41,551 INFO L470 AbstractCegarLoop]: Abstraction has 401 states and 595 transitions. [2021-11-22 15:26:41,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 12 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:26:41,551 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 595 transitions. [2021-11-22 15:26:41,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-22 15:26:41,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:26:41,553 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:26:41,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-22 15:26:41,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-22 15:26:41,777 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:26:41,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:26:41,778 INFO L85 PathProgramCache]: Analyzing trace with hash -833380899, now seen corresponding path program 5 times [2021-11-22 15:26:41,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:26:41,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562639024] [2021-11-22 15:26:41,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:26:41,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:26:41,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:26:42,019 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:26:42,019 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:26:42,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562639024] [2021-11-22 15:26:42,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562639024] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:26:42,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238396956] [2021-11-22 15:26:42,020 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 15:26:42,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:26:42,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:26:42,025 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:26:42,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-22 15:26:42,262 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-22 15:26:42,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:26:42,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-22 15:26:42,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:26:42,412 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:26:42,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:26:42,741 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:26:42,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238396956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:26:42,741 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:26:42,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 27 [2021-11-22 15:26:42,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118813180] [2021-11-22 15:26:42,742 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:26:42,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-22 15:26:42,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:26:42,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-22 15:26:42,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2021-11-22 15:26:42,744 INFO L87 Difference]: Start difference. First operand 401 states and 595 transitions. Second operand has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:27:11,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:27:11,352 INFO L93 Difference]: Finished difference Result 1252 states and 1834 transitions. [2021-11-22 15:27:11,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2021-11-22 15:27:11,353 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-22 15:27:11,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:27:11,358 INFO L225 Difference]: With dead ends: 1252 [2021-11-22 15:27:11,359 INFO L226 Difference]: Without dead ends: 1166 [2021-11-22 15:27:11,371 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17341 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=8385, Invalid=34257, Unknown=0, NotChecked=0, Total=42642 [2021-11-22 15:27:11,372 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 790 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 1885 mSolverCounterSat, 1018 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 790 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 2903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1018 IncrementalHoareTripleChecker+Valid, 1885 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:27:11,372 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [790 Valid, 520 Invalid, 2903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1018 Valid, 1885 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-22 15:27:11,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1166 states. [2021-11-22 15:27:11,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1166 to 502. [2021-11-22 15:27:11,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 1.5029940119760479) internal successors, (753), 501 states have internal predecessors, (753), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:27:11,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 753 transitions. [2021-11-22 15:27:11,409 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 753 transitions. Word has length 27 [2021-11-22 15:27:11,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:27:11,409 INFO L470 AbstractCegarLoop]: Abstraction has 502 states and 753 transitions. [2021-11-22 15:27:11,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:27:11,410 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 753 transitions. [2021-11-22 15:27:11,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-22 15:27:11,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:27:11,411 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:27:11,425 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-22 15:27:11,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-22 15:27:11,615 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:27:11,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:27:11,616 INFO L85 PathProgramCache]: Analyzing trace with hash 796082573, now seen corresponding path program 6 times [2021-11-22 15:27:11,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:27:11,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663965490] [2021-11-22 15:27:11,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:27:11,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:27:11,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:27:11,813 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-22 15:27:11,813 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:27:11,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663965490] [2021-11-22 15:27:11,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663965490] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:27:11,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451521006] [2021-11-22 15:27:11,813 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 15:27:11,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:27:11,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:27:11,814 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:27:11,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-22 15:27:11,881 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-22 15:27:11,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:27:11,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-22 15:27:11,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:27:12,036 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-22 15:27:12,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:27:12,101 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-22 15:27:12,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1451521006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:27:12,101 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:27:12,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8, 8] total 21 [2021-11-22 15:27:12,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195156850] [2021-11-22 15:27:12,101 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:27:12,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-22 15:27:12,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:27:12,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-22 15:27:12,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2021-11-22 15:27:12,103 INFO L87 Difference]: Start difference. First operand 502 states and 753 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:27:18,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:27:18,876 INFO L93 Difference]: Finished difference Result 1145 states and 1631 transitions. [2021-11-22 15:27:18,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-11-22 15:27:18,876 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-22 15:27:18,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:27:18,881 INFO L225 Difference]: With dead ends: 1145 [2021-11-22 15:27:18,881 INFO L226 Difference]: Without dead ends: 1050 [2021-11-22 15:27:18,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2930 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=989, Invalid=8517, Unknown=0, NotChecked=0, Total=9506 [2021-11-22 15:27:18,884 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 407 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 1195 mSolverCounterSat, 385 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 1580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 385 IncrementalHoareTripleChecker+Valid, 1195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-22 15:27:18,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [407 Valid, 462 Invalid, 1580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [385 Valid, 1195 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-22 15:27:18,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1050 states. [2021-11-22 15:27:18,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1050 to 530. [2021-11-22 15:27:18,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 1.4971644612476371) internal successors, (792), 529 states have internal predecessors, (792), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:27:18,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 792 transitions. [2021-11-22 15:27:18,927 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 792 transitions. Word has length 29 [2021-11-22 15:27:18,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:27:18,927 INFO L470 AbstractCegarLoop]: Abstraction has 530 states and 792 transitions. [2021-11-22 15:27:18,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 21 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:27:18,928 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 792 transitions. [2021-11-22 15:27:18,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-22 15:27:18,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:27:18,929 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:27:18,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-22 15:27:19,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:27:19,157 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:27:19,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:27:19,158 INFO L85 PathProgramCache]: Analyzing trace with hash -1004492410, now seen corresponding path program 6 times [2021-11-22 15:27:19,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:27:19,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308129898] [2021-11-22 15:27:19,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:27:19,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:27:19,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:27:19,849 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-22 15:27:19,849 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:27:19,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308129898] [2021-11-22 15:27:19,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308129898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:27:19,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943651079] [2021-11-22 15:27:19,850 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 15:27:19,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:27:19,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:27:19,853 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:27:19,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-22 15:27:20,028 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-22 15:27:20,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:27:20,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-22 15:27:20,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:27:42,517 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:27:42,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:27:44,156 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:27:44,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943651079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:27:44,157 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:27:44,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 20] total 47 [2021-11-22 15:27:44,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385281359] [2021-11-22 15:27:44,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:27:44,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-22 15:27:44,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:27:44,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-22 15:27:44,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1858, Unknown=0, NotChecked=0, Total=2162 [2021-11-22 15:27:44,159 INFO L87 Difference]: Start difference. First operand 530 states and 792 transitions. Second operand has 47 states, 47 states have (on average 1.7234042553191489) internal successors, (81), 47 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:28:01,364 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-22 15:28:02,810 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-22 15:28:06,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:28:06,409 INFO L93 Difference]: Finished difference Result 831 states and 1166 transitions. [2021-11-22 15:28:06,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-22 15:28:06,411 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.7234042553191489) internal successors, (81), 47 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-22 15:28:06,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:28:06,414 INFO L225 Difference]: With dead ends: 831 [2021-11-22 15:28:06,414 INFO L226 Difference]: Without dead ends: 714 [2021-11-22 15:28:06,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1880 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=993, Invalid=5487, Unknown=0, NotChecked=0, Total=6480 [2021-11-22 15:28:06,416 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 266 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 906 mSolverCounterSat, 263 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 1170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 263 IncrementalHoareTripleChecker+Valid, 906 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.8s IncrementalHoareTripleChecker+Time [2021-11-22 15:28:06,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 190 Invalid, 1170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [263 Valid, 906 Invalid, 1 Unknown, 0 Unchecked, 13.8s Time] [2021-11-22 15:28:06,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2021-11-22 15:28:06,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 543. [2021-11-22 15:28:06,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 543 states, 542 states have (on average 1.4797047970479704) internal successors, (802), 542 states have internal predecessors, (802), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:28:06,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 543 states to 543 states and 802 transitions. [2021-11-22 15:28:06,460 INFO L78 Accepts]: Start accepts. Automaton has 543 states and 802 transitions. Word has length 30 [2021-11-22 15:28:06,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:28:06,460 INFO L470 AbstractCegarLoop]: Abstraction has 543 states and 802 transitions. [2021-11-22 15:28:06,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.7234042553191489) internal successors, (81), 47 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:28:06,461 INFO L276 IsEmpty]: Start isEmpty. Operand 543 states and 802 transitions. [2021-11-22 15:28:06,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-22 15:28:06,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:28:06,463 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:28:06,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-22 15:28:06,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:28:06,663 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:28:06,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:28:06,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1893940903, now seen corresponding path program 7 times [2021-11-22 15:28:06,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:28:06,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959731781] [2021-11-22 15:28:06,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:28:06,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:28:06,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:28:06,995 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:28:06,996 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:28:06,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959731781] [2021-11-22 15:28:06,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959731781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:28:06,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801379612] [2021-11-22 15:28:06,996 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 15:28:06,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:28:06,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:28:07,002 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:28:07,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-22 15:28:07,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:28:07,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-22 15:28:07,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:28:07,271 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-22 15:28:07,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:28:07,355 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-22 15:28:07,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801379612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:28:07,356 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:28:07,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9, 9] total 24 [2021-11-22 15:28:07,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770956705] [2021-11-22 15:28:07,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:28:07,357 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-22 15:28:07,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:28:07,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-22 15:28:07,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2021-11-22 15:28:07,358 INFO L87 Difference]: Start difference. First operand 543 states and 802 transitions. Second operand has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:28:29,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:28:29,325 INFO L93 Difference]: Finished difference Result 1549 states and 2128 transitions. [2021-11-22 15:28:29,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 222 states. [2021-11-22 15:28:29,325 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-22 15:28:29,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:28:29,332 INFO L225 Difference]: With dead ends: 1549 [2021-11-22 15:28:29,332 INFO L226 Difference]: Without dead ends: 1478 [2021-11-22 15:28:29,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23391 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=3138, Invalid=54702, Unknown=0, NotChecked=0, Total=57840 [2021-11-22 15:28:29,339 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 658 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 3335 mSolverCounterSat, 708 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 658 SdHoareTripleChecker+Valid, 591 SdHoareTripleChecker+Invalid, 4043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 708 IncrementalHoareTripleChecker+Valid, 3335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:28:29,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [658 Valid, 591 Invalid, 4043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [708 Valid, 3335 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-11-22 15:28:29,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1478 states. [2021-11-22 15:28:29,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1478 to 599. [2021-11-22 15:28:29,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 599 states, 598 states have (on average 1.4899665551839465) internal successors, (891), 598 states have internal predecessors, (891), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:28:29,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 599 states to 599 states and 891 transitions. [2021-11-22 15:28:29,415 INFO L78 Accepts]: Start accepts. Automaton has 599 states and 891 transitions. Word has length 30 [2021-11-22 15:28:29,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:28:29,417 INFO L470 AbstractCegarLoop]: Abstraction has 599 states and 891 transitions. [2021-11-22 15:28:29,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0833333333333335) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:28:29,418 INFO L276 IsEmpty]: Start isEmpty. Operand 599 states and 891 transitions. [2021-11-22 15:28:29,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-22 15:28:29,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:28:29,420 INFO L514 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:28:29,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-22 15:28:29,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:28:29,641 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:28:29,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:28:29,642 INFO L85 PathProgramCache]: Analyzing trace with hash -1610409754, now seen corresponding path program 7 times [2021-11-22 15:28:29,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:28:29,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881061542] [2021-11-22 15:28:29,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:28:29,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:28:29,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:28:29,933 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 15:28:29,933 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:28:29,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881061542] [2021-11-22 15:28:29,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881061542] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:28:29,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203338118] [2021-11-22 15:28:29,933 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 15:28:29,934 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:28:29,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:28:29,935 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:28:29,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-22 15:28:29,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:28:29,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-22 15:28:29,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:28:30,122 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 15:28:30,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:28:30,802 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 15:28:30,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203338118] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:28:30,802 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:28:30,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2021-11-22 15:28:30,802 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408167218] [2021-11-22 15:28:30,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:28:30,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-22 15:28:30,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:28:30,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-22 15:28:30,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=921, Unknown=0, NotChecked=0, Total=1190 [2021-11-22 15:28:30,804 INFO L87 Difference]: Start difference. First operand 599 states and 891 transitions. Second operand has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:28:46,229 WARN L227 SmtUtils]: Spent 6.39s on a formula simplification that was a NOOP. DAG size: 58 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:29:12,439 WARN L227 SmtUtils]: Spent 11.21s on a formula simplification that was a NOOP. DAG size: 64 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:29:38,115 WARN L227 SmtUtils]: Spent 9.81s on a formula simplification that was a NOOP. DAG size: 61 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:30:34,374 WARN L227 SmtUtils]: Spent 5.79s on a formula simplification that was a NOOP. DAG size: 54 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:32:20,215 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.93s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-22 15:32:37,914 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-22 15:32:47,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:32:47,251 INFO L93 Difference]: Finished difference Result 1661 states and 2649 transitions. [2021-11-22 15:32:47,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-22 15:32:47,252 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-22 15:32:47,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:32:47,260 INFO L225 Difference]: With dead ends: 1661 [2021-11-22 15:32:47,260 INFO L226 Difference]: Without dead ends: 1466 [2021-11-22 15:32:47,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9037 ImplicationChecksByTransitivity, 229.3s TimeCoverageRelationStatistics Valid=6277, Invalid=17282, Unknown=3, NotChecked=0, Total=23562 [2021-11-22 15:32:47,270 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 1517 mSDsluCounter, 1123 mSDsCounter, 0 mSdLazyCounter, 1975 mSolverCounterSat, 1675 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1517 SdHoareTripleChecker+Valid, 1195 SdHoareTripleChecker+Invalid, 3650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1675 IncrementalHoareTripleChecker+Valid, 1975 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.8s IncrementalHoareTripleChecker+Time [2021-11-22 15:32:47,271 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1517 Valid, 1195 Invalid, 3650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1675 Valid, 1975 Invalid, 0 Unknown, 0 Unchecked, 27.8s Time] [2021-11-22 15:32:47,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1466 states. [2021-11-22 15:32:47,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1466 to 656. [2021-11-22 15:32:47,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 656 states, 655 states have (on average 1.483969465648855) internal successors, (972), 655 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:47,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656 states to 656 states and 972 transitions. [2021-11-22 15:32:47,336 INFO L78 Accepts]: Start accepts. Automaton has 656 states and 972 transitions. Word has length 30 [2021-11-22 15:32:47,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:32:47,337 INFO L470 AbstractCegarLoop]: Abstraction has 656 states and 972 transitions. [2021-11-22 15:32:47,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:47,337 INFO L276 IsEmpty]: Start isEmpty. Operand 656 states and 972 transitions. [2021-11-22 15:32:47,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-22 15:32:47,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:32:47,339 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:32:47,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-22 15:32:47,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-22 15:32:47,553 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:32:47,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:32:47,554 INFO L85 PathProgramCache]: Analyzing trace with hash 380203431, now seen corresponding path program 8 times [2021-11-22 15:32:47,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:32:47,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139540042] [2021-11-22 15:32:47,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:32:47,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:32:47,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:32:47,744 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-22 15:32:47,744 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:32:47,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139540042] [2021-11-22 15:32:47,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139540042] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:32:47,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641583170] [2021-11-22 15:32:47,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:32:47,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:32:47,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:32:47,747 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:32:47,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-22 15:32:47,813 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:32:47,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:32:47,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-22 15:32:47,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:32:47,986 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-22 15:32:47,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:32:48,092 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-22 15:32:48,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641583170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:32:48,093 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:32:48,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 15 [2021-11-22 15:32:48,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576973164] [2021-11-22 15:32:48,093 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:32:48,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-22 15:32:48,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:32:48,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-22 15:32:48,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2021-11-22 15:32:48,095 INFO L87 Difference]: Start difference. First operand 656 states and 972 transitions. Second operand has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:48,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:32:48,685 INFO L93 Difference]: Finished difference Result 1166 states and 1647 transitions. [2021-11-22 15:32:48,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-22 15:32:48,685 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-22 15:32:48,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:32:48,690 INFO L225 Difference]: With dead ends: 1166 [2021-11-22 15:32:48,690 INFO L226 Difference]: Without dead ends: 1129 [2021-11-22 15:32:48,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=344, Unknown=0, NotChecked=0, Total=462 [2021-11-22 15:32:48,692 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 227 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-22 15:32:48,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 184 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-22 15:32:48,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1129 states. [2021-11-22 15:32:48,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1129 to 662. [2021-11-22 15:32:48,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 662 states, 661 states have (on average 1.4780635400907716) internal successors, (977), 661 states have internal predecessors, (977), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:48,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 662 states to 662 states and 977 transitions. [2021-11-22 15:32:48,771 INFO L78 Accepts]: Start accepts. Automaton has 662 states and 977 transitions. Word has length 32 [2021-11-22 15:32:48,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:32:48,772 INFO L470 AbstractCegarLoop]: Abstraction has 662 states and 977 transitions. [2021-11-22 15:32:48,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6) internal successors, (39), 15 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:48,772 INFO L276 IsEmpty]: Start isEmpty. Operand 662 states and 977 transitions. [2021-11-22 15:32:48,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-22 15:32:48,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:32:48,774 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:32:48,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-22 15:32:48,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-22 15:32:48,997 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:32:48,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:32:48,998 INFO L85 PathProgramCache]: Analyzing trace with hash -404867559, now seen corresponding path program 3 times [2021-11-22 15:32:48,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:32:48,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710705854] [2021-11-22 15:32:48,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:32:48,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:32:49,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:32:49,204 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 15:32:49,204 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:32:49,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710705854] [2021-11-22 15:32:49,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [710705854] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:32:49,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442809584] [2021-11-22 15:32:49,205 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:32:49,205 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:32:49,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:32:49,206 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:32:49,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-22 15:32:49,405 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-22 15:32:49,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:32:49,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 15:32:49,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:32:49,562 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-22 15:32:49,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:32:49,748 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-22 15:32:49,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1442809584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:32:49,748 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:32:49,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 22 [2021-11-22 15:32:49,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139720336] [2021-11-22 15:32:49,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:32:49,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-22 15:32:49,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:32:49,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-22 15:32:49,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2021-11-22 15:32:49,750 INFO L87 Difference]: Start difference. First operand 662 states and 977 transitions. Second operand has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:52,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:32:52,359 INFO L93 Difference]: Finished difference Result 929 states and 1338 transitions. [2021-11-22 15:32:52,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-22 15:32:52,360 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-22 15:32:52,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:32:52,364 INFO L225 Difference]: With dead ends: 929 [2021-11-22 15:32:52,364 INFO L226 Difference]: Without dead ends: 749 [2021-11-22 15:32:52,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1188 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=451, Invalid=4519, Unknown=0, NotChecked=0, Total=4970 [2021-11-22 15:32:52,366 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 142 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 1021 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 430 SdHoareTripleChecker+Invalid, 1196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 1021 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-22 15:32:52,366 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 430 Invalid, 1196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 1021 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-22 15:32:52,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2021-11-22 15:32:52,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 622. [2021-11-22 15:32:52,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 622 states, 621 states have (on average 1.4573268921095008) internal successors, (905), 621 states have internal predecessors, (905), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:52,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 622 states to 622 states and 905 transitions. [2021-11-22 15:32:52,438 INFO L78 Accepts]: Start accepts. Automaton has 622 states and 905 transitions. Word has length 32 [2021-11-22 15:32:52,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:32:52,438 INFO L470 AbstractCegarLoop]: Abstraction has 622 states and 905 transitions. [2021-11-22 15:32:52,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:52,439 INFO L276 IsEmpty]: Start isEmpty. Operand 622 states and 905 transitions. [2021-11-22 15:32:52,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-22 15:32:52,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:32:52,441 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:32:52,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-22 15:32:52,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-22 15:32:52,669 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:32:52,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:32:52,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1396440605, now seen corresponding path program 8 times [2021-11-22 15:32:52,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:32:52,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512373437] [2021-11-22 15:32:52,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:32:52,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:32:52,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:32:53,056 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:32:53,056 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:32:53,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512373437] [2021-11-22 15:32:53,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512373437] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:32:53,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774664426] [2021-11-22 15:32:53,057 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:32:53,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:32:53,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:32:53,058 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:32:53,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-22 15:32:53,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:32:53,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:32:53,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-22 15:32:53,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:32:53,459 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-22 15:32:53,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:32:53,558 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-22 15:32:53,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774664426] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:32:53,559 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:32:53,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10, 10] total 27 [2021-11-22 15:32:53,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96258794] [2021-11-22 15:32:53,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:32:53,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-22 15:32:53,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:32:53,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-22 15:32:53,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=650, Unknown=0, NotChecked=0, Total=702 [2021-11-22 15:32:53,561 INFO L87 Difference]: Start difference. First operand 622 states and 905 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:00,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:34:00,390 INFO L93 Difference]: Finished difference Result 2076 states and 2757 transitions. [2021-11-22 15:34:00,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 321 states. [2021-11-22 15:34:00,391 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-22 15:34:00,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:34:00,399 INFO L225 Difference]: With dead ends: 2076 [2021-11-22 15:34:00,399 INFO L226 Difference]: Without dead ends: 1985 [2021-11-22 15:34:00,407 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 341 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49786 ImplicationChecksByTransitivity, 56.1s TimeCoverageRelationStatistics Valid=5237, Invalid=112069, Unknown=0, NotChecked=0, Total=117306 [2021-11-22 15:34:00,408 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 934 mSDsluCounter, 798 mSDsCounter, 0 mSdLazyCounter, 5122 mSolverCounterSat, 1211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 934 SdHoareTripleChecker+Valid, 848 SdHoareTripleChecker+Invalid, 6333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1211 IncrementalHoareTripleChecker+Valid, 5122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:34:00,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [934 Valid, 848 Invalid, 6333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1211 Valid, 5122 Invalid, 0 Unknown, 0 Unchecked, 11.0s Time] [2021-11-22 15:34:00,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1985 states. [2021-11-22 15:34:00,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1985 to 719. [2021-11-22 15:34:00,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 719 states, 718 states have (on average 1.4554317548746518) internal successors, (1045), 718 states have internal predecessors, (1045), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:00,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 719 states to 719 states and 1045 transitions. [2021-11-22 15:34:00,587 INFO L78 Accepts]: Start accepts. Automaton has 719 states and 1045 transitions. Word has length 33 [2021-11-22 15:34:00,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:34:00,588 INFO L470 AbstractCegarLoop]: Abstraction has 719 states and 1045 transitions. [2021-11-22 15:34:00,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:00,589 INFO L276 IsEmpty]: Start isEmpty. Operand 719 states and 1045 transitions. [2021-11-22 15:34:00,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-22 15:34:00,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:34:00,591 INFO L514 BasicCegarLoop]: trace histogram [14, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:34:00,621 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-22 15:34:00,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-22 15:34:00,805 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:34:00,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:34:00,806 INFO L85 PathProgramCache]: Analyzing trace with hash -2101731714, now seen corresponding path program 9 times [2021-11-22 15:34:00,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:34:00,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580160691] [2021-11-22 15:34:00,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:34:00,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:34:00,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:34:01,231 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-22 15:34:01,231 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:34:01,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580160691] [2021-11-22 15:34:01,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580160691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:34:01,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183060622] [2021-11-22 15:34:01,232 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:34:01,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:01,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:34:01,233 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:34:01,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-22 15:34:01,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-22 15:34:01,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:34:01,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-22 15:34:01,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:34:01,451 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-22 15:34:01,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:34:01,678 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-22 15:34:01,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183060622] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:34:01,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:34:01,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 7, 8] total 29 [2021-11-22 15:34:01,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729904315] [2021-11-22 15:34:01,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:34:01,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-22 15:34:01,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:34:01,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-22 15:34:01,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-11-22 15:34:01,680 INFO L87 Difference]: Start difference. First operand 719 states and 1045 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:08,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:34:08,878 INFO L93 Difference]: Finished difference Result 1308 states and 1897 transitions. [2021-11-22 15:34:08,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-11-22 15:34:08,879 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-22 15:34:08,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:34:08,884 INFO L225 Difference]: With dead ends: 1308 [2021-11-22 15:34:08,885 INFO L226 Difference]: Without dead ends: 1134 [2021-11-22 15:34:08,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7147 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1652, Invalid=20400, Unknown=0, NotChecked=0, Total=22052 [2021-11-22 15:34:08,886 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 167 mSDsluCounter, 988 mSDsCounter, 0 mSdLazyCounter, 4054 mSolverCounterSat, 501 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 1045 SdHoareTripleChecker+Invalid, 4555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 501 IncrementalHoareTripleChecker+Valid, 4054 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-22 15:34:08,887 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 1045 Invalid, 4555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [501 Valid, 4054 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-22 15:34:08,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1134 states. [2021-11-22 15:34:08,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1134 to 831. [2021-11-22 15:34:08,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 831 states, 830 states have (on average 1.4240963855421687) internal successors, (1182), 830 states have internal predecessors, (1182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:08,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 831 states to 831 states and 1182 transitions. [2021-11-22 15:34:08,980 INFO L78 Accepts]: Start accepts. Automaton has 831 states and 1182 transitions. Word has length 35 [2021-11-22 15:34:08,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:34:08,981 INFO L470 AbstractCegarLoop]: Abstraction has 831 states and 1182 transitions. [2021-11-22 15:34:08,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:08,981 INFO L276 IsEmpty]: Start isEmpty. Operand 831 states and 1182 transitions. [2021-11-22 15:34:08,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-22 15:34:08,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:34:08,984 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:34:09,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-22 15:34:09,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-22 15:34:09,197 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:34:09,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:34:09,198 INFO L85 PathProgramCache]: Analyzing trace with hash 1563221799, now seen corresponding path program 10 times [2021-11-22 15:34:09,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:34:09,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734200566] [2021-11-22 15:34:09,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:34:09,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:34:09,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:34:10,154 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-22 15:34:10,154 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:34:10,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734200566] [2021-11-22 15:34:10,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734200566] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:34:10,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078726190] [2021-11-22 15:34:10,155 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 15:34:10,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:10,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:34:10,157 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:34:10,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-22 15:34:10,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 15:34:10,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:34:10,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-22 15:34:10,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:34:11,034 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-22 15:34:11,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:34:11,895 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-22 15:34:11,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078726190] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:34:11,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:34:11,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 37 [2021-11-22 15:34:11,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688222117] [2021-11-22 15:34:11,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:34:11,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-22 15:34:11,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:34:11,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-22 15:34:11,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1183, Unknown=0, NotChecked=0, Total=1332 [2021-11-22 15:34:11,897 INFO L87 Difference]: Start difference. First operand 831 states and 1182 transitions. Second operand has 37 states, 37 states have (on average 2.5135135135135136) internal successors, (93), 37 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:18,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:34:18,916 INFO L93 Difference]: Finished difference Result 1079 states and 1450 transitions. [2021-11-22 15:34:18,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-22 15:34:18,916 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.5135135135135136) internal successors, (93), 37 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-22 15:34:18,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:34:18,921 INFO L225 Difference]: With dead ends: 1079 [2021-11-22 15:34:18,921 INFO L226 Difference]: Without dead ends: 1065 [2021-11-22 15:34:18,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1294 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=555, Invalid=4557, Unknown=0, NotChecked=0, Total=5112 [2021-11-22 15:34:18,922 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 132 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 769 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 882 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 769 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-22 15:34:18,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 266 Invalid, 882 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 769 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-22 15:34:18,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1065 states. [2021-11-22 15:34:18,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1065 to 852. [2021-11-22 15:34:18,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 852 states, 851 states have (on average 1.4171562867215042) internal successors, (1206), 851 states have internal predecessors, (1206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:19,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 852 states to 852 states and 1206 transitions. [2021-11-22 15:34:19,003 INFO L78 Accepts]: Start accepts. Automaton has 852 states and 1206 transitions. Word has length 36 [2021-11-22 15:34:19,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:34:19,003 INFO L470 AbstractCegarLoop]: Abstraction has 852 states and 1206 transitions. [2021-11-22 15:34:19,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.5135135135135136) internal successors, (93), 37 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:19,004 INFO L276 IsEmpty]: Start isEmpty. Operand 852 states and 1206 transitions. [2021-11-22 15:34:19,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-22 15:34:19,006 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:34:19,006 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:34:19,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-22 15:34:19,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:19,218 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:34:19,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:34:19,219 INFO L85 PathProgramCache]: Analyzing trace with hash 231042247, now seen corresponding path program 4 times [2021-11-22 15:34:19,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:34:19,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672492815] [2021-11-22 15:34:19,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:34:19,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:34:19,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:34:19,561 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-22 15:34:19,562 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:34:19,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672492815] [2021-11-22 15:34:19,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672492815] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:34:19,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805263611] [2021-11-22 15:34:19,562 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 15:34:19,562 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:19,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:34:19,564 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:34:19,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-22 15:34:19,632 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 15:34:19,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:34:19,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-22 15:34:19,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:34:19,942 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 20 proven. 32 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-22 15:34:19,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:34:20,017 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 20 proven. 32 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-22 15:34:20,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1805263611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:34:20,018 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:34:20,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 9] total 25 [2021-11-22 15:34:20,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786537464] [2021-11-22 15:34:20,018 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:34:20,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-22 15:34:20,018 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:34:20,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-22 15:34:20,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=547, Unknown=0, NotChecked=0, Total=600 [2021-11-22 15:34:20,019 INFO L87 Difference]: Start difference. First operand 852 states and 1206 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:35,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:34:35,226 INFO L93 Difference]: Finished difference Result 1726 states and 2347 transitions. [2021-11-22 15:34:35,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-11-22 15:34:35,226 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-22 15:34:35,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:34:35,233 INFO L225 Difference]: With dead ends: 1726 [2021-11-22 15:34:35,233 INFO L226 Difference]: Without dead ends: 1628 [2021-11-22 15:34:35,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6483 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=1581, Invalid=17601, Unknown=0, NotChecked=0, Total=19182 [2021-11-22 15:34:35,235 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 538 mSDsluCounter, 732 mSDsCounter, 0 mSdLazyCounter, 2287 mSolverCounterSat, 553 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 538 SdHoareTripleChecker+Valid, 799 SdHoareTripleChecker+Invalid, 2840 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 553 IncrementalHoareTripleChecker+Valid, 2287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:34:35,235 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [538 Valid, 799 Invalid, 2840 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [553 Valid, 2287 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-22 15:34:35,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1628 states. [2021-11-22 15:34:35,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1628 to 801. [2021-11-22 15:34:35,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 801 states, 800 states have (on average 1.4225) internal successors, (1138), 800 states have internal predecessors, (1138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:35,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 801 states to 801 states and 1138 transitions. [2021-11-22 15:34:35,298 INFO L78 Accepts]: Start accepts. Automaton has 801 states and 1138 transitions. Word has length 36 [2021-11-22 15:34:35,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:34:35,298 INFO L470 AbstractCegarLoop]: Abstraction has 801 states and 1138 transitions. [2021-11-22 15:34:35,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:35,299 INFO L276 IsEmpty]: Start isEmpty. Operand 801 states and 1138 transitions. [2021-11-22 15:34:35,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-22 15:34:35,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:34:35,301 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:34:35,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-22 15:34:35,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-22 15:34:35,517 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:34:35,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:34:35,518 INFO L85 PathProgramCache]: Analyzing trace with hash 61818599, now seen corresponding path program 9 times [2021-11-22 15:34:35,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:34:35,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711871491] [2021-11-22 15:34:35,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:34:35,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:34:35,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:34:35,960 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:34:35,960 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:34:35,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711871491] [2021-11-22 15:34:35,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711871491] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:34:35,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174067363] [2021-11-22 15:34:35,961 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:34:35,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:35,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:34:35,966 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:34:35,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_861e95df-a051-4107-9004-ad904538cef3/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-22 15:34:36,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-22 15:34:36,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:34:36,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-22 15:34:36,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:34:36,403 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:34:36,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:34:37,030 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:34:37,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [174067363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:34:37,031 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:34:37,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 39 [2021-11-22 15:34:37,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119600197] [2021-11-22 15:34:37,031 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:34:37,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-22 15:34:37,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:34:37,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-22 15:34:37,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1245, Unknown=0, NotChecked=0, Total=1482 [2021-11-22 15:34:37,034 INFO L87 Difference]: Start difference. First operand 801 states and 1138 transitions. Second operand has 39 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 39 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:35:03,927 WARN L227 SmtUtils]: Spent 17.48s on a formula simplification that was a NOOP. DAG size: 65 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:35:22,826 WARN L227 SmtUtils]: Spent 12.96s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:35:38,949 WARN L227 SmtUtils]: Spent 10.52s on a formula simplification that was a NOOP. DAG size: 58 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:35:49,144 WARN L227 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 60 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:36:41,411 WARN L227 SmtUtils]: Spent 8.08s on a formula simplification that was a NOOP. DAG size: 60 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-22 15:36:46,030 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-22 15:36:56,112 WARN L227 SmtUtils]: Spent 6.08s on a formula simplification that was a NOOP. DAG size: 57 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)