./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/config/svcomp-MemCleanup-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7c883b81b24ce5a721aa9a1ff13aef8a0d532ba87d9e130e470a0b88a1f8e93e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:11:03,194 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:11:03,196 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:11:03,243 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:11:03,244 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:11:03,250 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:11:03,254 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:11:03,258 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:11:03,262 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:11:03,267 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:11:03,269 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:11:03,271 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:11:03,272 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:11:03,275 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:11:03,277 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:11:03,280 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:11:03,282 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:11:03,283 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:11:03,290 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:11:03,301 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:11:03,303 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:11:03,305 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:11:03,308 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:11:03,309 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:11:03,313 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:11:03,314 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:11:03,314 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:11:03,316 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:11:03,317 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:11:03,318 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:11:03,319 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:11:03,320 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:11:03,322 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:11:03,324 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:11:03,326 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:11:03,326 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:11:03,327 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:11:03,327 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:11:03,328 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:11:03,329 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:11:03,330 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:11:03,331 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/config/svcomp-MemCleanup-32bit-Taipan_Default.epf [2021-11-07 02:11:03,379 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:11:03,379 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:11:03,381 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:11:03,388 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:11:03,388 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:11:03,388 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:11:03,389 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:11:03,389 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:11:03,389 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:11:03,389 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:11:03,391 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:11:03,391 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:11:03,391 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:11:03,392 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:11:03,392 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:11:03,393 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-07 02:11:03,393 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-07 02:11:03,393 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:11:03,394 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:11:03,394 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-07 02:11:03,394 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:11:03,394 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:11:03,395 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:11:03,395 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-07 02:11:03,395 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-07 02:11:03,395 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:11:03,397 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:11:03,397 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:11:03,398 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:11:03,398 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:11:03,398 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:11:03,399 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:11:03,399 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:11:03,399 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:11:03,399 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:11:03,400 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:11:03,400 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:11:03,400 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:11:03,400 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c883b81b24ce5a721aa9a1ff13aef8a0d532ba87d9e130e470a0b88a1f8e93e [2021-11-07 02:11:03,711 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:11:03,734 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:11:03,737 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:11:03,738 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:11:03,739 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:11:03,739 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i [2021-11-07 02:11:03,825 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data/e3cf44f9f/48facbea81f344dbb80beb4cea1cd482/FLAG21698f843 [2021-11-07 02:11:04,516 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:11:04,517 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/sv-benchmarks/c/memsafety-bftpd/bftpd_2.i [2021-11-07 02:11:04,530 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data/e3cf44f9f/48facbea81f344dbb80beb4cea1cd482/FLAG21698f843 [2021-11-07 02:11:04,741 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data/e3cf44f9f/48facbea81f344dbb80beb4cea1cd482 [2021-11-07 02:11:04,743 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:11:04,750 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:11:04,752 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:11:04,752 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:11:04,756 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:11:04,757 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:11:04" (1/1) ... [2021-11-07 02:11:04,759 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5870299c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:04, skipping insertion in model container [2021-11-07 02:11:04,759 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:11:04" (1/1) ... [2021-11-07 02:11:04,766 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:11:04,821 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:11:05,188 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:11:05,198 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:11:05,255 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:11:05,309 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:11:05,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05 WrapperNode [2021-11-07 02:11:05,310 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:11:05,311 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:11:05,312 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:11:05,312 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:11:05,320 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,353 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,406 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:11:05,407 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:11:05,407 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:11:05,407 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:11:05,416 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,417 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,431 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,432 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,461 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,464 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,468 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:11:05,468 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:11:05,469 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:11:05,469 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:11:05,477 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (1/1) ... [2021-11-07 02:11:05,490 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:11:05,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:11:05,528 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:11:05,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:11:05,573 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-07 02:11:05,574 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-07 02:11:05,574 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:11:05,575 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-07 02:11:05,575 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-07 02:11:05,575 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-07 02:11:05,582 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 02:11:05,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:11:05,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:11:06,293 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:11:06,293 INFO L299 CfgBuilder]: Removed 31 assume(true) statements. [2021-11-07 02:11:06,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:11:06 BoogieIcfgContainer [2021-11-07 02:11:06,297 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:11:06,299 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:11:06,299 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:11:06,303 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:11:06,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:11:04" (1/3) ... [2021-11-07 02:11:06,304 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@676c2b7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:11:06, skipping insertion in model container [2021-11-07 02:11:06,304 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:11:05" (2/3) ... [2021-11-07 02:11:06,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@676c2b7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:11:06, skipping insertion in model container [2021-11-07 02:11:06,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:11:06" (3/3) ... [2021-11-07 02:11:06,306 INFO L111 eAbstractionObserver]: Analyzing ICFG bftpd_2.i [2021-11-07 02:11:06,312 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:11:06,313 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 58 error locations. [2021-11-07 02:11:06,362 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:11:06,369 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 02:11:06,369 INFO L340 AbstractCegarLoop]: Starting to check reachability of 58 error locations. [2021-11-07 02:11:06,388 INFO L276 IsEmpty]: Start isEmpty. Operand has 142 states, 83 states have (on average 1.9518072289156627) internal successors, (162), 141 states have internal predecessors, (162), 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) [2021-11-07 02:11:06,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-07 02:11:06,394 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:06,395 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-07 02:11:06,396 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:06,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:06,402 INFO L85 PathProgramCache]: Analyzing trace with hash 290544, now seen corresponding path program 1 times [2021-11-07 02:11:06,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:06,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851560291] [2021-11-07 02:11:06,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:06,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:06,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:06,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:06,626 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:06,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851560291] [2021-11-07 02:11:06,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851560291] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:06,627 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:06,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-07 02:11:06,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489690874] [2021-11-07 02:11:06,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:11:06,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:06,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:11:06,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:06,659 INFO L87 Difference]: Start difference. First operand has 142 states, 83 states have (on average 1.9518072289156627) internal successors, (162), 141 states have internal predecessors, (162), 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 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-11-07 02:11:06,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:06,847 INFO L93 Difference]: Finished difference Result 153 states and 174 transitions. [2021-11-07 02:11:06,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:11:06,849 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2021-11-07 02:11:06,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:06,866 INFO L225 Difference]: With dead ends: 153 [2021-11-07 02:11:06,866 INFO L226 Difference]: Without dead ends: 151 [2021-11-07 02:11:06,870 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:06,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-07 02:11:06,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 144. [2021-11-07 02:11:06,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 93 states have (on average 1.8064516129032258) internal successors, (168), 143 states have internal predecessors, (168), 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) [2021-11-07 02:11:06,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 168 transitions. [2021-11-07 02:11:06,908 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 168 transitions. Word has length 3 [2021-11-07 02:11:06,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:06,909 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 168 transitions. [2021-11-07 02:11:06,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-11-07 02:11:06,909 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 168 transitions. [2021-11-07 02:11:06,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-07 02:11:06,910 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:06,910 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-07 02:11:06,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 02:11:06,910 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:06,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:06,911 INFO L85 PathProgramCache]: Analyzing trace with hash 290545, now seen corresponding path program 1 times [2021-11-07 02:11:06,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:06,912 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18980140] [2021-11-07 02:11:06,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:06,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:06,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:07,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:07,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:07,030 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18980140] [2021-11-07 02:11:07,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18980140] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:07,031 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:07,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-07 02:11:07,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648626928] [2021-11-07 02:11:07,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:11:07,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:07,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:11:07,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:07,034 INFO L87 Difference]: Start difference. First operand 144 states and 168 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-11-07 02:11:07,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:07,190 INFO L93 Difference]: Finished difference Result 249 states and 284 transitions. [2021-11-07 02:11:07,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:11:07,191 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2021-11-07 02:11:07,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:07,200 INFO L225 Difference]: With dead ends: 249 [2021-11-07 02:11:07,201 INFO L226 Difference]: Without dead ends: 249 [2021-11-07 02:11:07,201 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:07,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-11-07 02:11:07,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 202. [2021-11-07 02:11:07,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 151 states have (on average 1.7350993377483444) internal successors, (262), 201 states have internal predecessors, (262), 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) [2021-11-07 02:11:07,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 262 transitions. [2021-11-07 02:11:07,229 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 262 transitions. Word has length 3 [2021-11-07 02:11:07,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:07,229 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 262 transitions. [2021-11-07 02:11:07,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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) [2021-11-07 02:11:07,230 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 262 transitions. [2021-11-07 02:11:07,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-07 02:11:07,230 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:07,231 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-07 02:11:07,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 02:11:07,231 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:07,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:07,232 INFO L85 PathProgramCache]: Analyzing trace with hash 9006847, now seen corresponding path program 1 times [2021-11-07 02:11:07,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:07,233 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254672221] [2021-11-07 02:11:07,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:07,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:07,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:07,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:07,454 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:07,454 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254672221] [2021-11-07 02:11:07,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254672221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:07,455 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:07,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 02:11:07,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820076867] [2021-11-07 02:11:07,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:11:07,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:07,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:11:07,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:11:07,459 INFO L87 Difference]: Start difference. First operand 202 states and 262 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-07 02:11:07,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:07,686 INFO L93 Difference]: Finished difference Result 220 states and 275 transitions. [2021-11-07 02:11:07,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:11:07,687 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2021-11-07 02:11:07,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:07,689 INFO L225 Difference]: With dead ends: 220 [2021-11-07 02:11:07,689 INFO L226 Difference]: Without dead ends: 220 [2021-11-07 02:11:07,689 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:11:07,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-07 02:11:07,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 202. [2021-11-07 02:11:07,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 151 states have (on average 1.728476821192053) internal successors, (261), 201 states have internal predecessors, (261), 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) [2021-11-07 02:11:07,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 261 transitions. [2021-11-07 02:11:07,710 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 261 transitions. Word has length 4 [2021-11-07 02:11:07,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:07,711 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 261 transitions. [2021-11-07 02:11:07,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-07 02:11:07,711 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 261 transitions. [2021-11-07 02:11:07,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-07 02:11:07,711 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:07,712 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-07 02:11:07,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 02:11:07,712 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:07,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:07,713 INFO L85 PathProgramCache]: Analyzing trace with hash 279212304, now seen corresponding path program 1 times [2021-11-07 02:11:07,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:07,713 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729091035] [2021-11-07 02:11:07,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:07,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:07,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:07,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:07,957 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:07,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729091035] [2021-11-07 02:11:07,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1729091035] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:07,959 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:07,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 02:11:07,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275749643] [2021-11-07 02:11:07,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:11:07,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:07,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:11:07,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:11:07,967 INFO L87 Difference]: Start difference. First operand 202 states and 261 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-07 02:11:08,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:08,145 INFO L93 Difference]: Finished difference Result 211 states and 261 transitions. [2021-11-07 02:11:08,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:11:08,147 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 5 [2021-11-07 02:11:08,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:08,148 INFO L225 Difference]: With dead ends: 211 [2021-11-07 02:11:08,148 INFO L226 Difference]: Without dead ends: 211 [2021-11-07 02:11:08,149 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:11:08,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-07 02:11:08,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 202. [2021-11-07 02:11:08,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 151 states have (on average 1.7218543046357615) internal successors, (260), 201 states have internal predecessors, (260), 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) [2021-11-07 02:11:08,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 260 transitions. [2021-11-07 02:11:08,163 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 260 transitions. Word has length 5 [2021-11-07 02:11:08,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:08,163 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 260 transitions. [2021-11-07 02:11:08,163 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2021-11-07 02:11:08,163 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 260 transitions. [2021-11-07 02:11:08,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 02:11:08,164 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:08,164 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 02:11:08,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 02:11:08,164 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:08,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:08,165 INFO L85 PathProgramCache]: Analyzing trace with hash 65646881, now seen corresponding path program 1 times [2021-11-07 02:11:08,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:08,165 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2127045043] [2021-11-07 02:11:08,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:08,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:08,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:08,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:08,290 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:08,290 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2127045043] [2021-11-07 02:11:08,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2127045043] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:08,290 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:08,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 02:11:08,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92428154] [2021-11-07 02:11:08,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:11:08,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:08,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:11:08,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:11:08,292 INFO L87 Difference]: Start difference. First operand 202 states and 260 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-07 02:11:08,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:08,393 INFO L93 Difference]: Finished difference Result 223 states and 281 transitions. [2021-11-07 02:11:08,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:11:08,394 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2021-11-07 02:11:08,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:08,396 INFO L225 Difference]: With dead ends: 223 [2021-11-07 02:11:08,396 INFO L226 Difference]: Without dead ends: 223 [2021-11-07 02:11:08,396 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:11:08,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-07 02:11:08,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 211. [2021-11-07 02:11:08,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 161 states have (on average 1.7142857142857142) internal successors, (276), 210 states have internal predecessors, (276), 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) [2021-11-07 02:11:08,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 276 transitions. [2021-11-07 02:11:08,403 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 276 transitions. Word has length 6 [2021-11-07 02:11:08,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:08,404 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 276 transitions. [2021-11-07 02:11:08,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2021-11-07 02:11:08,404 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 276 transitions. [2021-11-07 02:11:08,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-07 02:11:08,404 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:08,404 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:08,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 02:11:08,405 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:08,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:08,405 INFO L85 PathProgramCache]: Analyzing trace with hash 2035053362, now seen corresponding path program 1 times [2021-11-07 02:11:08,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:08,406 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265757396] [2021-11-07 02:11:08,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:08,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:08,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:08,460 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:08,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:08,461 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265757396] [2021-11-07 02:11:08,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265757396] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:08,461 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:08,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-07 02:11:08,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786872622] [2021-11-07 02:11:08,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:11:08,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:08,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:11:08,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:08,463 INFO L87 Difference]: Start difference. First operand 211 states and 276 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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) [2021-11-07 02:11:08,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:08,513 INFO L93 Difference]: Finished difference Result 214 states and 278 transitions. [2021-11-07 02:11:08,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:11:08,513 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 7 [2021-11-07 02:11:08,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:08,515 INFO L225 Difference]: With dead ends: 214 [2021-11-07 02:11:08,515 INFO L226 Difference]: Without dead ends: 214 [2021-11-07 02:11:08,515 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:08,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-07 02:11:08,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 210. [2021-11-07 02:11:08,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 161 states have (on average 1.7018633540372672) internal successors, (274), 209 states have internal predecessors, (274), 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) [2021-11-07 02:11:08,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 274 transitions. [2021-11-07 02:11:08,525 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 274 transitions. Word has length 7 [2021-11-07 02:11:08,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:08,525 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 274 transitions. [2021-11-07 02:11:08,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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) [2021-11-07 02:11:08,526 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 274 transitions. [2021-11-07 02:11:08,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 02:11:08,527 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:08,527 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:08,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 02:11:08,527 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:08,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:08,528 INFO L85 PathProgramCache]: Analyzing trace with hash 1255185624, now seen corresponding path program 1 times [2021-11-07 02:11:08,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:08,533 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338947943] [2021-11-07 02:11:08,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:08,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:08,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:08,658 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:08,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:08,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338947943] [2021-11-07 02:11:08,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338947943] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:11:08,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590452080] [2021-11-07 02:11:08,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:08,660 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:08,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:11:08,661 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:11:08,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 02:11:08,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:08,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:11:08,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:09,010 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-07 02:11:09,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 21 treesize of output 51 [2021-11-07 02:11:09,269 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:09,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:09,401 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:09,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590452080] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:11:09,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1955127476] [2021-11-07 02:11:09,424 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-07 02:11:09,425 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:11:09,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 02:11:09,443 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 02:11:09,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 02:11:09,513 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,522 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:09,524 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,525 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-07 02:11:09,526 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:09,527 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,530 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 02:11:09,547 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-07 02:11:09,599 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_55|], 78=[|v_#valid_87|]} [2021-11-07 02:11:09,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-07 02:11:09,723 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,724 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:11:09,724 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,730 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:11:09,731 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:09,751 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:09,752 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,752 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:09,753 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,753 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:09,754 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:09,779 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:09,779 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,780 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:09,781 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,781 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:09,782 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:09,801 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:09,802 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,803 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:09,803 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,804 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:09,804 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:09,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:09,883 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:09,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:09,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:10,024 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-07 02:11:10,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-07 02:11:10,032 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:10,037 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:11:10,038 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:10,039 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:11:10,039 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:10,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:10,078 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:10,087 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:10,098 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-07 02:11:10,100 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 02:11:10,100 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-07 02:11:10,151 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-07 02:11:10,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-07 02:11:10,185 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:10,200 INFO L185 QuantifierPusher]: treesize reduction 3, result has 99.3 percent of original size 452 [2021-11-07 02:11:10,221 INFO L180 QuantifierPusher]: treesize reduction 6, result has 98.8 percent of original size [2021-11-07 02:11:10,235 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 514 [2021-11-07 02:11:10,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:10,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:10,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:10,606 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:10,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1107 [2021-11-07 02:11:10,693 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:10,723 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1190 [2021-11-07 02:11:10,781 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:10,833 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1107 [2021-11-07 02:11:10,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,619 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:11,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,013 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,221 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:12,235 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 02:11:15,692 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 02:11:15,692 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:11:15,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 2, 2] total 6 [2021-11-07 02:11:15,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387463719] [2021-11-07 02:11:15,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:11:15,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:15,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:11:15,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:11:15,694 INFO L87 Difference]: Start difference. First operand 210 states and 274 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 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) [2021-11-07 02:11:15,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:15,997 INFO L93 Difference]: Finished difference Result 370 states and 442 transitions. [2021-11-07 02:11:15,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 02:11:15,999 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 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 11 [2021-11-07 02:11:15,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:16,001 INFO L225 Difference]: With dead ends: 370 [2021-11-07 02:11:16,001 INFO L226 Difference]: Without dead ends: 370 [2021-11-07 02:11:16,001 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:11:16,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-07 02:11:16,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 224. [2021-11-07 02:11:16,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 178 states have (on average 1.6404494382022472) internal successors, (292), 223 states have internal predecessors, (292), 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) [2021-11-07 02:11:16,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 292 transitions. [2021-11-07 02:11:16,009 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 292 transitions. Word has length 11 [2021-11-07 02:11:16,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:16,010 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 292 transitions. [2021-11-07 02:11:16,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 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) [2021-11-07 02:11:16,010 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 292 transitions. [2021-11-07 02:11:16,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-07 02:11:16,011 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:16,011 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:16,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:11:16,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:16,231 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:16,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:16,231 INFO L85 PathProgramCache]: Analyzing trace with hash 256048632, now seen corresponding path program 1 times [2021-11-07 02:11:16,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:16,232 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659274116] [2021-11-07 02:11:16,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:16,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:16,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:16,457 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:16,458 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:16,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659274116] [2021-11-07 02:11:16,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659274116] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:11:16,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479477977] [2021-11-07 02:11:16,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:16,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:16,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:11:16,461 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:11:16,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 02:11:16,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:16,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 02:11:16,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:16,705 INFO L354 Elim1Store]: treesize reduction 497, result has 11.1 percent of original size [2021-11-07 02:11:16,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 7 case distinctions, treesize of input 99 treesize of output 131 [2021-11-07 02:11:23,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 90 treesize of output 66 [2021-11-07 02:11:23,680 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:23,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:23,747 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:23,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479477977] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:11:23,747 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [354991128] [2021-11-07 02:11:23,750 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-07 02:11:23,758 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:11:23,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 02:11:23,759 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 02:11:23,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 02:11:23,776 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,777 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:23,778 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,779 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 02:11:23,779 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:23,780 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,780 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-07 02:11:23,786 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-07 02:11:23,800 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_56|], 78=[|v_#valid_89|]} [2021-11-07 02:11:23,813 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:23,814 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,814 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:23,815 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,815 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:23,816 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:23,827 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:23,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,828 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:23,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:23,829 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:23,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-07 02:11:23,920 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,920 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:11:23,921 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,922 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:11:23,922 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:23,933 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:23,934 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,934 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:23,935 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,935 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:23,935 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:23,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:23,962 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:23,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:23,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:24,059 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-07 02:11:24,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-07 02:11:24,060 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:24,065 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:11:24,065 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:24,066 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:11:24,066 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:24,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,088 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:24,094 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:24,101 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-07 02:11:24,102 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 02:11:24,102 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-07 02:11:24,161 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-07 02:11:24,174 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-07 02:11:24,189 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:24,199 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 485 [2021-11-07 02:11:24,219 INFO L180 QuantifierPusher]: treesize reduction 23, result has 95.8 percent of original size [2021-11-07 02:11:24,233 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 527 [2021-11-07 02:11:24,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,501 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:24,551 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1117 [2021-11-07 02:11:24,583 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:24,604 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1197 [2021-11-07 02:11:24,655 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:24,696 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1117 [2021-11-07 02:11:24,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:24,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,772 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:25,794 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 02:11:27,843 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 02:11:27,844 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:11:27,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3, 3] total 11 [2021-11-07 02:11:27,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673383505] [2021-11-07 02:11:27,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-07 02:11:27,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:27,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-07 02:11:27,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-07 02:11:27,846 INFO L87 Difference]: Start difference. First operand 224 states and 292 transitions. Second operand has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 12 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) [2021-11-07 02:11:31,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:31,319 INFO L93 Difference]: Finished difference Result 800 states and 1011 transitions. [2021-11-07 02:11:31,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 02:11:31,320 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 12 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 12 [2021-11-07 02:11:31,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:31,324 INFO L225 Difference]: With dead ends: 800 [2021-11-07 02:11:31,325 INFO L226 Difference]: Without dead ends: 800 [2021-11-07 02:11:31,325 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2021-11-07 02:11:31,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2021-11-07 02:11:31,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 366. [2021-11-07 02:11:31,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 321 states have (on average 1.6105919003115265) internal successors, (517), 365 states have internal predecessors, (517), 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) [2021-11-07 02:11:31,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 517 transitions. [2021-11-07 02:11:31,340 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 517 transitions. Word has length 12 [2021-11-07 02:11:31,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:31,340 INFO L470 AbstractCegarLoop]: Abstraction has 366 states and 517 transitions. [2021-11-07 02:11:31,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 12 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) [2021-11-07 02:11:31,341 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 517 transitions. [2021-11-07 02:11:31,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 02:11:31,342 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:31,342 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:31,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 02:11:31,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:31,567 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:31,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:31,567 INFO L85 PathProgramCache]: Analyzing trace with hash -652426953, now seen corresponding path program 1 times [2021-11-07 02:11:31,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:31,567 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212117583] [2021-11-07 02:11:31,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:31,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:31,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:31,798 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:31,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:31,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212117583] [2021-11-07 02:11:31,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212117583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:11:31,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670930468] [2021-11-07 02:11:31,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:31,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:31,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:11:31,802 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:11:31,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 02:11:31,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:31,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 02:11:31,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:32,078 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-07 02:11:32,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 48 treesize of output 83 [2021-11-07 02:11:32,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 131 treesize of output 127 [2021-11-07 02:11:34,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 86 treesize of output 62 [2021-11-07 02:11:34,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 47 [2021-11-07 02:11:34,617 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:34,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:34,743 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:34,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [670930468] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:11:34,743 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [609963092] [2021-11-07 02:11:34,745 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-07 02:11:34,746 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:11:34,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 02:11:34,746 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 02:11:34,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 02:11:34,758 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,759 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:34,759 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,760 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-07 02:11:34,760 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:34,761 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,764 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 02:11:34,769 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-07 02:11:34,779 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_58|], 78=[|v_#valid_91|]} [2021-11-07 02:11:34,791 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:34,791 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:34,792 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,792 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:34,792 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:34,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-07 02:11:34,877 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:11:34,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:11:34,878 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:34,888 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:34,888 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,888 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:34,889 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:34,889 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:34,900 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:34,901 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,901 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:34,902 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,903 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:34,903 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:34,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:34,919 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:34,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:34,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:35,012 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-07 02:11:35,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-07 02:11:35,014 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:35,017 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:11:35,021 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:35,022 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:11:35,022 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:35,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,047 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:35,055 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:35,062 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-07 02:11:35,063 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 02:11:35,064 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-07 02:11:35,099 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-07 02:11:35,108 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-07 02:11:35,118 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:35,127 INFO L185 QuantifierPusher]: treesize reduction 3, result has 99.3 percent of original size 452 [2021-11-07 02:11:35,144 INFO L180 QuantifierPusher]: treesize reduction 6, result has 98.8 percent of original size [2021-11-07 02:11:35,154 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 514 [2021-11-07 02:11:35,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,383 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:35,415 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1107 [2021-11-07 02:11:35,436 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:35,453 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1190 [2021-11-07 02:11:35,497 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:35,528 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1107 [2021-11-07 02:11:35,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:35,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,476 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:36,490 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 02:11:39,332 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 02:11:39,333 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:11:39,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 10 [2021-11-07 02:11:39,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760479708] [2021-11-07 02:11:39,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-07 02:11:39,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:39,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-07 02:11:39,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-11-07 02:11:39,334 INFO L87 Difference]: Start difference. First operand 366 states and 517 transitions. Second operand has 12 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 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) [2021-11-07 02:11:40,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:40,148 INFO L93 Difference]: Finished difference Result 829 states and 1023 transitions. [2021-11-07 02:11:40,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 02:11:40,149 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 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 13 [2021-11-07 02:11:40,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:40,154 INFO L225 Difference]: With dead ends: 829 [2021-11-07 02:11:40,154 INFO L226 Difference]: Without dead ends: 829 [2021-11-07 02:11:40,155 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-11-07 02:11:40,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 829 states. [2021-11-07 02:11:40,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 829 to 402. [2021-11-07 02:11:40,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 358 states have (on average 1.5921787709497206) internal successors, (570), 401 states have internal predecessors, (570), 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) [2021-11-07 02:11:40,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 570 transitions. [2021-11-07 02:11:40,171 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 570 transitions. Word has length 13 [2021-11-07 02:11:40,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:40,172 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 570 transitions. [2021-11-07 02:11:40,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 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) [2021-11-07 02:11:40,172 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 570 transitions. [2021-11-07 02:11:40,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-07 02:11:40,173 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:40,173 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:40,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-07 02:11:40,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable116 [2021-11-07 02:11:40,399 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:40,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:40,399 INFO L85 PathProgramCache]: Analyzing trace with hash -1265049470, now seen corresponding path program 1 times [2021-11-07 02:11:40,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:40,399 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778124682] [2021-11-07 02:11:40,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:40,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:40,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:40,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:40,452 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:40,452 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778124682] [2021-11-07 02:11:40,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778124682] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:40,452 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:40,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:11:40,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811965566] [2021-11-07 02:11:40,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:11:40,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:40,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:11:40,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:40,453 INFO L87 Difference]: Start difference. First operand 402 states and 570 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-11-07 02:11:40,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:40,464 INFO L93 Difference]: Finished difference Result 360 states and 493 transitions. [2021-11-07 02:11:40,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:11:40,464 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 14 [2021-11-07 02:11:40,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:40,466 INFO L225 Difference]: With dead ends: 360 [2021-11-07 02:11:40,466 INFO L226 Difference]: Without dead ends: 360 [2021-11-07 02:11:40,466 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:40,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-11-07 02:11:40,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 271. [2021-11-07 02:11:40,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 245 states have (on average 1.5387755102040817) internal successors, (377), 270 states have internal predecessors, (377), 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) [2021-11-07 02:11:40,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 377 transitions. [2021-11-07 02:11:40,472 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 377 transitions. Word has length 14 [2021-11-07 02:11:40,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:40,472 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 377 transitions. [2021-11-07 02:11:40,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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) [2021-11-07 02:11:40,472 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 377 transitions. [2021-11-07 02:11:40,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-07 02:11:40,473 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:40,473 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:40,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable171 [2021-11-07 02:11:40,473 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:40,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:40,473 INFO L85 PathProgramCache]: Analyzing trace with hash -561212118, now seen corresponding path program 1 times [2021-11-07 02:11:40,473 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:40,473 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747989054] [2021-11-07 02:11:40,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:40,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:40,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:40,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:40,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:40,516 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747989054] [2021-11-07 02:11:40,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747989054] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:40,516 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:40,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 02:11:40,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488932115] [2021-11-07 02:11:40,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:11:40,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:40,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:11:40,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:40,518 INFO L87 Difference]: Start difference. First operand 271 states and 377 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 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) [2021-11-07 02:11:40,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:40,547 INFO L93 Difference]: Finished difference Result 372 states and 518 transitions. [2021-11-07 02:11:40,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:11:40,547 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 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 [2021-11-07 02:11:40,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:40,550 INFO L225 Difference]: With dead ends: 372 [2021-11-07 02:11:40,550 INFO L226 Difference]: Without dead ends: 372 [2021-11-07 02:11:40,551 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:40,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-11-07 02:11:40,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 352. [2021-11-07 02:11:40,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 330 states have (on average 1.5545454545454545) internal successors, (513), 351 states have internal predecessors, (513), 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) [2021-11-07 02:11:40,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 513 transitions. [2021-11-07 02:11:40,560 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 513 transitions. Word has length 15 [2021-11-07 02:11:40,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:40,561 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 513 transitions. [2021-11-07 02:11:40,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 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) [2021-11-07 02:11:40,561 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 513 transitions. [2021-11-07 02:11:40,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 02:11:40,562 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:40,562 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:40,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable172 [2021-11-07 02:11:40,563 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:40,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:40,563 INFO L85 PathProgramCache]: Analyzing trace with hash 1839629140, now seen corresponding path program 1 times [2021-11-07 02:11:40,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:40,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [393581614] [2021-11-07 02:11:40,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:40,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:40,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:40,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:40,599 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:40,600 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [393581614] [2021-11-07 02:11:40,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [393581614] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:40,600 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:40,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:11:40,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776949815] [2021-11-07 02:11:40,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:11:40,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:40,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:11:40,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:40,602 INFO L87 Difference]: Start difference. First operand 352 states and 513 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 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) [2021-11-07 02:11:40,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:40,613 INFO L93 Difference]: Finished difference Result 303 states and 398 transitions. [2021-11-07 02:11:40,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:11:40,614 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-07 02:11:40,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:40,616 INFO L225 Difference]: With dead ends: 303 [2021-11-07 02:11:40,616 INFO L226 Difference]: Without dead ends: 303 [2021-11-07 02:11:40,617 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:11:40,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-11-07 02:11:40,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 284. [2021-11-07 02:11:40,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 262 states have (on average 1.5038167938931297) internal successors, (394), 283 states have internal predecessors, (394), 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) [2021-11-07 02:11:40,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 394 transitions. [2021-11-07 02:11:40,625 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 394 transitions. Word has length 17 [2021-11-07 02:11:40,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:40,626 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 394 transitions. [2021-11-07 02:11:40,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 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) [2021-11-07 02:11:40,626 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 394 transitions. [2021-11-07 02:11:40,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-07 02:11:40,628 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:40,628 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:40,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2021-11-07 02:11:40,629 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:40,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:40,630 INFO L85 PathProgramCache]: Analyzing trace with hash -53162952, now seen corresponding path program 1 times [2021-11-07 02:11:40,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:40,630 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064035906] [2021-11-07 02:11:40,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:40,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:40,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:40,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:40,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:40,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064035906] [2021-11-07 02:11:40,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1064035906] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:40,719 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:40,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 02:11:40,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448489998] [2021-11-07 02:11:40,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:11:40,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:40,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:11:40,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:11:40,724 INFO L87 Difference]: Start difference. First operand 284 states and 394 transitions. Second operand has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 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) [2021-11-07 02:11:41,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:41,012 INFO L93 Difference]: Finished difference Result 399 states and 479 transitions. [2021-11-07 02:11:41,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 02:11:41,014 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 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 19 [2021-11-07 02:11:41,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:41,016 INFO L225 Difference]: With dead ends: 399 [2021-11-07 02:11:41,016 INFO L226 Difference]: Without dead ends: 399 [2021-11-07 02:11:41,017 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:11:41,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-11-07 02:11:41,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 299. [2021-11-07 02:11:41,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 277 states have (on average 1.4512635379061372) internal successors, (402), 298 states have internal predecessors, (402), 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) [2021-11-07 02:11:41,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 402 transitions. [2021-11-07 02:11:41,026 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 402 transitions. Word has length 19 [2021-11-07 02:11:41,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:41,026 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 402 transitions. [2021-11-07 02:11:41,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 5 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) [2021-11-07 02:11:41,027 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 402 transitions. [2021-11-07 02:11:41,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-07 02:11:41,027 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:41,028 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:41,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174 [2021-11-07 02:11:41,028 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr23ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:41,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:41,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1901937109, now seen corresponding path program 1 times [2021-11-07 02:11:41,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:41,029 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16676849] [2021-11-07 02:11:41,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:41,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:41,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:41,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:41,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:41,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16676849] [2021-11-07 02:11:41,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [16676849] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:41,083 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:41,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 02:11:41,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802482404] [2021-11-07 02:11:41,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:11:41,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:41,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:11:41,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:11:41,085 INFO L87 Difference]: Start difference. First operand 299 states and 402 transitions. Second operand has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 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) [2021-11-07 02:11:41,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:41,175 INFO L93 Difference]: Finished difference Result 348 states and 451 transitions. [2021-11-07 02:11:41,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:11:41,176 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 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 20 [2021-11-07 02:11:41,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:41,178 INFO L225 Difference]: With dead ends: 348 [2021-11-07 02:11:41,178 INFO L226 Difference]: Without dead ends: 348 [2021-11-07 02:11:41,179 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:11:41,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-07 02:11:41,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 298. [2021-11-07 02:11:41,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 277 states have (on average 1.4332129963898916) internal successors, (397), 297 states have internal predecessors, (397), 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) [2021-11-07 02:11:41,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 397 transitions. [2021-11-07 02:11:41,188 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 397 transitions. Word has length 20 [2021-11-07 02:11:41,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:41,188 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 397 transitions. [2021-11-07 02:11:41,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 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) [2021-11-07 02:11:41,188 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 397 transitions. [2021-11-07 02:11:41,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-07 02:11:41,189 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:41,189 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:41,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable175 [2021-11-07 02:11:41,190 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:41,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:41,190 INFO L85 PathProgramCache]: Analyzing trace with hash -1169491627, now seen corresponding path program 1 times [2021-11-07 02:11:41,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:41,191 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952643323] [2021-11-07 02:11:41,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:41,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:41,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:41,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:41,280 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:41,280 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952643323] [2021-11-07 02:11:41,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952643323] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:41,281 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:41,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 02:11:41,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026864302] [2021-11-07 02:11:41,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:11:41,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:41,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:11:41,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:11:41,283 INFO L87 Difference]: Start difference. First operand 298 states and 397 transitions. Second operand has 4 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 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) [2021-11-07 02:11:41,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:41,394 INFO L93 Difference]: Finished difference Result 315 states and 396 transitions. [2021-11-07 02:11:41,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:11:41,394 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 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 [2021-11-07 02:11:41,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:41,396 INFO L225 Difference]: With dead ends: 315 [2021-11-07 02:11:41,396 INFO L226 Difference]: Without dead ends: 315 [2021-11-07 02:11:41,397 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:11:41,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-11-07 02:11:41,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 298. [2021-11-07 02:11:41,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 277 states have (on average 1.4151624548736461) internal successors, (392), 297 states have internal predecessors, (392), 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) [2021-11-07 02:11:41,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 392 transitions. [2021-11-07 02:11:41,405 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 392 transitions. Word has length 21 [2021-11-07 02:11:41,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:41,405 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 392 transitions. [2021-11-07 02:11:41,406 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 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) [2021-11-07 02:11:41,406 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 392 transitions. [2021-11-07 02:11:41,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-07 02:11:41,406 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:41,407 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:41,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2021-11-07 02:11:41,407 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:41,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:41,408 INFO L85 PathProgramCache]: Analyzing trace with hash 450012023, now seen corresponding path program 1 times [2021-11-07 02:11:41,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:41,408 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858394921] [2021-11-07 02:11:41,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:41,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:41,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:41,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:41,669 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:41,669 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858394921] [2021-11-07 02:11:41,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858394921] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:41,669 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:41,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-07 02:11:41,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609273747] [2021-11-07 02:11:41,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:11:41,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:41,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:11:41,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:11:41,671 INFO L87 Difference]: Start difference. First operand 298 states and 392 transitions. Second operand has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 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) [2021-11-07 02:11:42,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:42,080 INFO L93 Difference]: Finished difference Result 366 states and 447 transitions. [2021-11-07 02:11:42,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 02:11:42,081 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 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 [2021-11-07 02:11:42,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:42,083 INFO L225 Difference]: With dead ends: 366 [2021-11-07 02:11:42,083 INFO L226 Difference]: Without dead ends: 366 [2021-11-07 02:11:42,083 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:11:42,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2021-11-07 02:11:42,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 249. [2021-11-07 02:11:42,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 228 states have (on average 1.4035087719298245) internal successors, (320), 248 states have internal predecessors, (320), 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) [2021-11-07 02:11:42,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 320 transitions. [2021-11-07 02:11:42,090 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 320 transitions. Word has length 21 [2021-11-07 02:11:42,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:42,090 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 320 transitions. [2021-11-07 02:11:42,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 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) [2021-11-07 02:11:42,091 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 320 transitions. [2021-11-07 02:11:42,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-07 02:11:42,092 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:42,092 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:42,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable177 [2021-11-07 02:11:42,092 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:42,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:42,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1330138439, now seen corresponding path program 1 times [2021-11-07 02:11:42,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:42,093 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147503420] [2021-11-07 02:11:42,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:42,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:42,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:42,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:42,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:42,282 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147503420] [2021-11-07 02:11:42,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147503420] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:42,282 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:11:42,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 02:11:42,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390395052] [2021-11-07 02:11:42,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 02:11:42,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:42,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 02:11:42,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:11:42,284 INFO L87 Difference]: Start difference. First operand 249 states and 320 transitions. Second operand has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:11:42,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:42,696 INFO L93 Difference]: Finished difference Result 286 states and 348 transitions. [2021-11-07 02:11:42,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:11:42,696 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-07 02:11:42,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:42,698 INFO L225 Difference]: With dead ends: 286 [2021-11-07 02:11:42,698 INFO L226 Difference]: Without dead ends: 286 [2021-11-07 02:11:42,698 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:11:42,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-07 02:11:42,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 248. [2021-11-07 02:11:42,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 228 states have (on average 1.394736842105263) internal successors, (318), 247 states have internal predecessors, (318), 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) [2021-11-07 02:11:42,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 318 transitions. [2021-11-07 02:11:42,705 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 318 transitions. Word has length 23 [2021-11-07 02:11:42,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:42,705 INFO L470 AbstractCegarLoop]: Abstraction has 248 states and 318 transitions. [2021-11-07 02:11:42,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:11:42,706 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 318 transitions. [2021-11-07 02:11:42,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-07 02:11:42,706 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:42,707 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:42,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable178 [2021-11-07 02:11:42,707 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:42,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:42,708 INFO L85 PathProgramCache]: Analyzing trace with hash 1411096223, now seen corresponding path program 1 times [2021-11-07 02:11:42,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:42,708 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603724395] [2021-11-07 02:11:42,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:42,708 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:42,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:42,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:42,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:42,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603724395] [2021-11-07 02:11:42,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603724395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:11:42,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080205980] [2021-11-07 02:11:42,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:42,841 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:42,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:11:42,847 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:11:42,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 02:11:43,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:43,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 02:11:43,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:43,178 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-07 02:11:43,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 46 treesize of output 75 [2021-11-07 02:11:43,313 INFO L354 Elim1Store]: treesize reduction 365, result has 12.0 percent of original size [2021-11-07 02:11:43,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 6 case distinctions, treesize of input 75 treesize of output 105 [2021-11-07 02:11:43,721 INFO L354 Elim1Store]: treesize reduction 32, result has 31.9 percent of original size [2021-11-07 02:11:43,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 42 treesize of output 51 [2021-11-07 02:11:43,746 INFO L354 Elim1Store]: treesize reduction 8, result has 68.0 percent of original size [2021-11-07 02:11:43,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 56 [2021-11-07 02:11:44,047 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:44,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:44,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:44,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080205980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:11:44,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1918658448] [2021-11-07 02:11:44,434 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-07 02:11:44,434 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:11:44,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 02:11:44,435 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 02:11:44,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 02:11:44,452 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,453 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:44,453 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,454 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-07 02:11:44,454 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:44,455 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,455 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 02:11:44,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-07 02:11:44,484 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_62|], 78=[|v_#valid_95|]} [2021-11-07 02:11:44,495 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:44,496 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:44,496 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,497 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:44,497 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:44,508 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:44,508 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,514 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:44,515 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,515 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:44,516 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:44,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-07 02:11:44,598 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,599 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:11:44,599 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,600 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:11:44,600 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:44,611 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:44,611 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:44,612 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,612 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:44,613 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:44,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:44,628 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,722 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-07 02:11:44,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-07 02:11:44,723 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,727 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:11:44,728 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,728 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:11:44,729 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:44,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:44,746 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,752 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,758 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-07 02:11:44,759 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 02:11:44,760 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-07 02:11:44,795 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-07 02:11:44,809 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-07 02:11:44,830 INFO L180 QuantifierPusher]: treesize reduction 18, result has 96.5 percent of original size [2021-11-07 02:11:44,838 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 490 [2021-11-07 02:11:44,861 INFO L180 QuantifierPusher]: treesize reduction 18, result has 96.9 percent of original size [2021-11-07 02:11:44,867 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:11:44,868 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:44,869 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-07 02:11:44,878 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 555 [2021-11-07 02:11:44,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,926 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 02:11:44,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:11:44,940 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 02:11:44,968 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 02:11:44,998 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-07 02:11:44,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 23 disjoint index pairs (out of 28 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 73 treesize of output 84 [2021-11-07 02:11:44,999 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,001 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 67 [2021-11-07 02:11:45,002 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,003 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 67 [2021-11-07 02:11:45,004 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:45,030 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:11:45,034 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:45,035 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,035 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:11:45,036 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 02:11:45,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:45,080 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,089 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,098 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 542 [2021-11-07 02:11:45,099 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 02:11:45,099 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:1097, output treesize:542 [2021-11-07 02:11:45,135 INFO L180 QuantifierPusher]: treesize reduction 9, result has 98.4 percent of original size [2021-11-07 02:11:45,146 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 542 [2021-11-07 02:11:45,161 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,171 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 536 [2021-11-07 02:11:45,189 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,203 INFO L185 QuantifierPusher]: treesize reduction 9, result has 98.2 percent of original size 489 [2021-11-07 02:11:45,236 INFO L180 QuantifierPusher]: treesize reduction 12, result has 97.9 percent of original size [2021-11-07 02:11:45,247 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 569 [2021-11-07 02:11:45,268 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,280 INFO L185 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size 536 [2021-11-07 02:11:45,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:45,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:45,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:45,647 INFO L180 QuantifierPusher]: treesize reduction 15, result has 98.8 percent of original size [2021-11-07 02:11:45,680 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1262 [2021-11-07 02:11:45,709 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,754 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1276 [2021-11-07 02:11:45,875 INFO L180 QuantifierPusher]: treesize reduction 15, result has 98.8 percent of original size [2021-11-07 02:11:45,898 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1262 [2021-11-07 02:11:45,935 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:11:45,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1276 [2021-11-07 02:11:45,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:11:46,509 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 02:11:58,248 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 02:11:58,248 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:11:58,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 14 [2021-11-07 02:11:58,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048535604] [2021-11-07 02:11:58,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:11:58,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:11:58,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:11:58,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=728, Unknown=0, NotChecked=0, Total=930 [2021-11-07 02:11:58,251 INFO L87 Difference]: Start difference. First operand 248 states and 318 transitions. Second operand has 16 states, 15 states have (on average 5.4) internal successors, (81), 15 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) [2021-11-07 02:11:59,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:59,303 INFO L93 Difference]: Finished difference Result 403 states and 464 transitions. [2021-11-07 02:11:59,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 02:11:59,304 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 5.4) internal successors, (81), 15 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 27 [2021-11-07 02:11:59,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:59,306 INFO L225 Difference]: With dead ends: 403 [2021-11-07 02:11:59,306 INFO L226 Difference]: Without dead ends: 403 [2021-11-07 02:11:59,307 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 47 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=350, Invalid=1372, Unknown=0, NotChecked=0, Total=1722 [2021-11-07 02:11:59,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-11-07 02:11:59,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 244. [2021-11-07 02:11:59,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 230 states have (on average 1.3304347826086957) internal successors, (306), 243 states have internal predecessors, (306), 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) [2021-11-07 02:11:59,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 306 transitions. [2021-11-07 02:11:59,316 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 306 transitions. Word has length 27 [2021-11-07 02:11:59,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:59,316 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 306 transitions. [2021-11-07 02:11:59,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 5.4) internal successors, (81), 15 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) [2021-11-07 02:11:59,317 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 306 transitions. [2021-11-07 02:11:59,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-07 02:11:59,317 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:59,318 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:11:59,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 02:11:59,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable179 [2021-11-07 02:11:59,543 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:11:59,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:59,543 INFO L85 PathProgramCache]: Analyzing trace with hash -1146193890, now seen corresponding path program 1 times [2021-11-07 02:11:59,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:11:59,543 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988762517] [2021-11-07 02:11:59,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:59,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:11:59,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:59,978 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:11:59,978 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:11:59,978 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988762517] [2021-11-07 02:11:59,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988762517] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:11:59,978 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650989038] [2021-11-07 02:11:59,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:59,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:59,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:11:59,980 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:12:00,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 02:12:00,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:12:00,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-07 02:12:00,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:12:00,469 INFO L354 Elim1Store]: treesize reduction 521, result has 10.6 percent of original size [2021-11-07 02:12:00,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 11 case distinctions, treesize of input 256 treesize of output 286 [2021-11-07 02:12:00,556 INFO L354 Elim1Store]: treesize reduction 380, result has 7.8 percent of original size [2021-11-07 02:12:00,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 286 treesize of output 295 [2021-11-07 02:12:17,225 INFO L354 Elim1Store]: treesize reduction 194, result has 27.3 percent of original size [2021-11-07 02:12:17,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 161 treesize of output 211 [2021-11-07 02:12:17,332 INFO L354 Elim1Store]: treesize reduction 252, result has 12.8 percent of original size [2021-11-07 02:12:17,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 190 treesize of output 207 [2021-11-07 02:12:19,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 116 treesize of output 92 [2021-11-07 02:12:19,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 89 treesize of output 77 [2021-11-07 02:12:20,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:12:20,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:12:20,779 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:12:20,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650989038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:12:20,779 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [95675464] [2021-11-07 02:12:20,782 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-07 02:12:20,782 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:12:20,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 02:12:20,783 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 02:12:20,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 02:12:20,797 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,798 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:12:20,799 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,799 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 02:12:20,800 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:12:20,801 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,801 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 118 [2021-11-07 02:12:20,807 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 507 [2021-11-07 02:12:20,815 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_67|], 78=[|v_#valid_100|]} [2021-11-07 02:12:20,827 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:12:20,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,828 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:12:20,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,829 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:12:20,829 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 02:12:20,840 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:12:20,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,841 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:12:20,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:12:20,842 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 02:12:20,852 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:12:20,853 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,853 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:12:20,854 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:12:20,854 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-11-07 02:12:20,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 22 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 31 [2021-11-07 02:12:20,903 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:12:20,904 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,905 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-11-07 02:12:20,905 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-11-07 02:12:20,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:20,919 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:20,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:20,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,014 INFO L354 Elim1Store]: treesize reduction 90, result has 15.1 percent of original size [2021-11-07 02:12:21,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 18 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 71 treesize of output 70 [2021-11-07 02:12:21,016 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,020 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:12:21,021 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,021 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-11-07 02:12:21,022 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-11-07 02:12:21,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:21,038 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,044 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 403 [2021-11-07 02:12:21,051 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 02:12:21,052 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:1853, output treesize:403 [2021-11-07 02:12:21,098 INFO L180 QuantifierPusher]: treesize reduction 3, result has 99.4 percent of original size [2021-11-07 02:12:21,107 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 478 [2021-11-07 02:12:21,130 INFO L180 QuantifierPusher]: treesize reduction 18, result has 96.5 percent of original size [2021-11-07 02:12:21,137 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 490 [2021-11-07 02:12:21,160 INFO L180 QuantifierPusher]: treesize reduction 18, result has 96.9 percent of original size [2021-11-07 02:12:21,162 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:12:21,163 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 73 [2021-11-07 02:12:21,170 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 555 [2021-11-07 02:12:21,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,218 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 02:12:21,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 02:12:21,226 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 02:12:21,257 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 02:12:21,282 INFO L354 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2021-11-07 02:12:21,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 25 disjoint index pairs (out of 28 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 73 treesize of output 84 [2021-11-07 02:12:21,283 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,285 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-07 02:12:21,285 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,286 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-11-07 02:12:21,290 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 02:12:21,319 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-07 02:12:21,320 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:12:21,320 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,323 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-11-07 02:12:21,323 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 02:12:21,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:21,340 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,346 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,351 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 543 [2021-11-07 02:12:21,353 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 02:12:21,354 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:1097, output treesize:543 [2021-11-07 02:12:21,376 INFO L180 QuantifierPusher]: treesize reduction 9, result has 98.4 percent of original size [2021-11-07 02:12:21,398 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 543 [2021-11-07 02:12:21,413 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,418 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 537 [2021-11-07 02:12:21,429 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,439 INFO L185 QuantifierPusher]: treesize reduction 9, result has 98.2 percent of original size 491 [2021-11-07 02:12:21,473 INFO L180 QuantifierPusher]: treesize reduction 12, result has 97.9 percent of original size [2021-11-07 02:12:21,483 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 571 [2021-11-07 02:12:21,494 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,505 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 578 [2021-11-07 02:12:21,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:21,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:21,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:21,789 INFO L180 QuantifierPusher]: treesize reduction 27, result has 97.9 percent of original size [2021-11-07 02:12:21,790 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:12:21,804 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,815 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1165 [2021-11-07 02:12:21,851 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1289 [2021-11-07 02:12:21,864 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1303 [2021-11-07 02:12:21,954 INFO L180 QuantifierPusher]: treesize reduction 27, result has 97.9 percent of original size [2021-11-07 02:12:21,955 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 02:12:21,977 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:21,988 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1165 [2021-11-07 02:12:22,012 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1289 [2021-11-07 02:12:22,037 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 02:12:22,059 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1303 [2021-11-07 02:12:22,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,147 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 02:12:22,532 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 02:12:42,797 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 02:12:42,797 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:12:42,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 16 [2021-11-07 02:12:42,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325877906] [2021-11-07 02:12:42,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 02:12:42,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:12:42,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 02:12:42,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=842, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 02:12:42,800 INFO L87 Difference]: Start difference. First operand 244 states and 306 transitions. Second operand has 18 states, 17 states have (on average 5.117647058823529) internal successors, (87), 17 states have internal predecessors, (87), 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) [2021-11-07 02:13:19,281 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-11-07 02:13:19,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-07 02:13:19,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-11-07 02:13:19,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-07 02:13:19,482 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:13:19,483 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parseCheckSatResult(Executor.java:260) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.checkSat(Scriptor.java:155) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.checkSat(WrapperScript.java:163) at de.uni_freiburg.informatik.ultimate.logic.Util.checkSat(Util.java:61) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA.getRedundancy(SimplifyDDA.java:621) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.simplify.SimplifyDDAWithTimeout.getRedundancy(SimplifyDDAWithTimeout.java:120) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA$Simplifier.walk(SimplifyDDA.java:371) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:115) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:106) at de.uni_freiburg.informatik.ultimate.logic.simplification.SimplifyDDA.simplifyOnce(SimplifyDDA.java:650) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.simplify.SimplifyDDAWithTimeout.getSimplifiedTerm(SimplifyDDAWithTimeout.java:180) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.simplify(SmtUtils.java:174) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.simplify(SmtUtils.java:140) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate(PredicateUnifier.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:388) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicateForConjunction(PredicateUnifier.java:229) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.getOrConstructPredicate(DeterministicInterpolantAutomaton.java:282) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.constructSuccessorsAndTransitions(DeterministicInterpolantAutomaton.java:304) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:79) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:869) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:783) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: EOF at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser$Action$.CUP$do_action(Parser.java:1465) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Parser.do_action(Parser.java:658) at com.github.jhoenicke.javacup.runtime.LRParser.parse(LRParser.java:383) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:237) ... 56 more [2021-11-07 02:13:19,488 INFO L168 Benchmark]: Toolchain (without parser) took 134738.22 ms. Allocated memory was 90.2 MB in the beginning and 272.6 MB in the end (delta: 182.5 MB). Free memory was 53.3 MB in the beginning and 213.1 MB in the end (delta: -159.9 MB). Peak memory consumption was 23.2 MB. Max. memory is 16.1 GB. [2021-11-07 02:13:19,489 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 90.2 MB. Free memory was 62.9 MB in the beginning and 62.9 MB in the end (delta: 25.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:13:19,489 INFO L168 Benchmark]: CACSL2BoogieTranslator took 558.13 ms. Allocated memory is still 90.2 MB. Free memory was 53.1 MB in the beginning and 55.0 MB in the end (delta: -1.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-07 02:13:19,489 INFO L168 Benchmark]: Boogie Procedure Inliner took 94.90 ms. Allocated memory is still 90.2 MB. Free memory was 55.0 MB in the beginning and 52.4 MB in the end (delta: 2.6 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-11-07 02:13:19,489 INFO L168 Benchmark]: Boogie Preprocessor took 60.87 ms. Allocated memory is still 90.2 MB. Free memory was 52.2 MB in the beginning and 50.3 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-07 02:13:19,489 INFO L168 Benchmark]: RCFGBuilder took 828.29 ms. Allocated memory was 90.2 MB in the beginning and 119.5 MB in the end (delta: 29.4 MB). Free memory was 50.1 MB in the beginning and 82.6 MB in the end (delta: -32.5 MB). Peak memory consumption was 18.4 MB. Max. memory is 16.1 GB. [2021-11-07 02:13:19,490 INFO L168 Benchmark]: TraceAbstraction took 133189.25 ms. Allocated memory was 119.5 MB in the beginning and 272.6 MB in the end (delta: 153.1 MB). Free memory was 81.7 MB in the beginning and 213.1 MB in the end (delta: -131.5 MB). Peak memory consumption was 21.8 MB. Max. memory is 16.1 GB. [2021-11-07 02:13:19,491 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 90.2 MB. Free memory was 62.9 MB in the beginning and 62.9 MB in the end (delta: 25.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 558.13 ms. Allocated memory is still 90.2 MB. Free memory was 53.1 MB in the beginning and 55.0 MB in the end (delta: -1.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 94.90 ms. Allocated memory is still 90.2 MB. Free memory was 55.0 MB in the beginning and 52.4 MB in the end (delta: 2.6 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 60.87 ms. Allocated memory is still 90.2 MB. Free memory was 52.2 MB in the beginning and 50.3 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 828.29 ms. Allocated memory was 90.2 MB in the beginning and 119.5 MB in the end (delta: 29.4 MB). Free memory was 50.1 MB in the beginning and 82.6 MB in the end (delta: -32.5 MB). Peak memory consumption was 18.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 133189.25 ms. Allocated memory was 119.5 MB in the beginning and 272.6 MB in the end (delta: 153.1 MB). Free memory was 81.7 MB in the beginning and 213.1 MB in the end (delta: -131.5 MB). Peak memory consumption was 21.8 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") : de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.parse(Executor.java:241) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7c883b81b24ce5a721aa9a1ff13aef8a0d532ba87d9e130e470a0b88a1f8e93e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:13:21,730 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:13:21,734 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:13:21,808 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:13:21,809 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:13:21,814 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:13:21,816 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:13:21,820 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:13:21,823 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:13:21,831 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:13:21,833 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:13:21,835 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:13:21,835 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:13:21,838 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:13:21,840 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:13:21,844 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:13:21,846 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:13:21,847 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:13:21,850 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:13:21,858 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:13:21,860 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:13:21,861 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:13:21,865 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:13:21,866 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:13:21,875 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:13:21,876 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:13:21,876 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:13:21,878 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:13:21,879 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:13:21,880 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:13:21,881 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:13:21,882 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:13:21,884 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:13:21,885 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:13:21,886 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:13:21,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:13:21,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:13:21,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:13:21,888 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:13:21,890 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:13:21,891 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:13:21,892 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf [2021-11-07 02:13:21,935 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:13:21,935 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:13:21,937 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:13:21,937 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:13:21,937 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:13:21,938 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:13:21,938 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:13:21,938 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:13:21,939 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:13:21,940 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-07 02:13:21,941 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-07 02:13:21,942 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:13:21,942 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:13:21,942 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-07 02:13:21,943 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:13:21,943 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:13:21,943 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:13:21,943 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-07 02:13:21,944 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-07 02:13:21,944 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:13:21,944 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:13:21,944 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 02:13:21,945 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 02:13:21,945 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:13:21,945 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:13:21,946 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:13:21,946 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 02:13:21,946 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:13:21,946 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:13:21,947 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:13:21,947 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:13:21,947 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 02:13:21,948 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 02:13:21,948 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:13:21,949 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:13:21,949 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c883b81b24ce5a721aa9a1ff13aef8a0d532ba87d9e130e470a0b88a1f8e93e [2021-11-07 02:13:22,380 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:13:22,418 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:13:22,424 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:13:22,425 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:13:22,426 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:13:22,427 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/memsafety-bftpd/bftpd_2.i [2021-11-07 02:13:22,509 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data/9b5607a5b/30eef512cd7a491f9b9f7303825761d2/FLAG989ddcb2e [2021-11-07 02:13:23,198 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:13:23,199 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/sv-benchmarks/c/memsafety-bftpd/bftpd_2.i [2021-11-07 02:13:23,219 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data/9b5607a5b/30eef512cd7a491f9b9f7303825761d2/FLAG989ddcb2e [2021-11-07 02:13:23,428 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/data/9b5607a5b/30eef512cd7a491f9b9f7303825761d2 [2021-11-07 02:13:23,431 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:13:23,433 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:13:23,437 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:13:23,437 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:13:23,441 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:13:23,447 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:13:23" (1/1) ... [2021-11-07 02:13:23,448 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@129e19b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:23, skipping insertion in model container [2021-11-07 02:13:23,448 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:13:23" (1/1) ... [2021-11-07 02:13:23,456 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:13:23,511 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:13:23,882 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:13:23,898 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:13:23,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:13:24,044 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:13:24,045 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24 WrapperNode [2021-11-07 02:13:24,045 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:13:24,047 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:13:24,047 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:13:24,047 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:13:24,053 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,074 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,123 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:13:24,124 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:13:24,124 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:13:24,124 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:13:24,133 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,133 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,138 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,139 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,153 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,158 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,160 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,164 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:13:24,165 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:13:24,165 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:13:24,166 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:13:24,167 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (1/1) ... [2021-11-07 02:13:24,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:13:24,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:13:24,197 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:13:24,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:13:24,245 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-07 02:13:24,245 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-07 02:13:24,245 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:13:24,245 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-07 02:13:24,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-07 02:13:24,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-07 02:13:24,246 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 02:13:24,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:13:24,246 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:13:25,105 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:13:25,106 INFO L299 CfgBuilder]: Removed 31 assume(true) statements. [2021-11-07 02:13:25,108 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:13:25 BoogieIcfgContainer [2021-11-07 02:13:25,111 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:13:25,114 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:13:25,115 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:13:25,118 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:13:25,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:13:23" (1/3) ... [2021-11-07 02:13:25,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a2f5e03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:13:25, skipping insertion in model container [2021-11-07 02:13:25,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:13:24" (2/3) ... [2021-11-07 02:13:25,120 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a2f5e03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:13:25, skipping insertion in model container [2021-11-07 02:13:25,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:13:25" (3/3) ... [2021-11-07 02:13:25,121 INFO L111 eAbstractionObserver]: Analyzing ICFG bftpd_2.i [2021-11-07 02:13:25,127 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:13:25,127 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 58 error locations. [2021-11-07 02:13:25,185 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:13:25,190 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 02:13:25,191 INFO L340 AbstractCegarLoop]: Starting to check reachability of 58 error locations. [2021-11-07 02:13:25,206 INFO L276 IsEmpty]: Start isEmpty. Operand has 147 states, 88 states have (on average 1.9318181818181819) internal successors, (170), 146 states have internal predecessors, (170), 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) [2021-11-07 02:13:25,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-07 02:13:25,212 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:13:25,212 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-07 02:13:25,213 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:13:25,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:13:25,222 INFO L85 PathProgramCache]: Analyzing trace with hash 925765, now seen corresponding path program 1 times [2021-11-07 02:13:25,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:13:25,240 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1647614122] [2021-11-07 02:13:25,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:13:25,241 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:13:25,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:13:25,244 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:13:25,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 02:13:25,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:13:25,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:13:25,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:13:25,667 INFO L354 Elim1Store]: treesize reduction 351, result has 15.4 percent of original size [2021-11-07 02:13:25,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 6 case distinctions, treesize of input 24 treesize of output 69 [2021-11-07 02:13:26,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:13:26,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:13:26,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:13:26,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:13:26,436 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1647614122] [2021-11-07 02:13:26,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1647614122] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:13:26,437 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:13:26,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1, 1] imperfect sequences [] total 1 [2021-11-07 02:13:26,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318648588] [2021-11-07 02:13:26,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:13:26,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:13:26,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:13:26,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:13:26,461 INFO L87 Difference]: Start difference. First operand has 147 states, 88 states have (on average 1.9318181818181819) internal successors, (170), 146 states have internal predecessors, (170), 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 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 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) [2021-11-07 02:13:26,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:13:26,778 INFO L93 Difference]: Finished difference Result 159 states and 180 transitions. [2021-11-07 02:13:26,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:13:26,780 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2021-11-07 02:13:26,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:13:26,792 INFO L225 Difference]: With dead ends: 159 [2021-11-07 02:13:26,792 INFO L226 Difference]: Without dead ends: 155 [2021-11-07 02:13:26,794 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:13:26,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-07 02:13:26,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 148. [2021-11-07 02:13:26,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 97 states have (on average 1.7731958762886597) internal successors, (172), 147 states have internal predecessors, (172), 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) [2021-11-07 02:13:26,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 172 transitions. [2021-11-07 02:13:26,862 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 172 transitions. Word has length 4 [2021-11-07 02:13:26,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:13:26,862 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 172 transitions. [2021-11-07 02:13:26,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 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) [2021-11-07 02:13:26,863 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 172 transitions. [2021-11-07 02:13:26,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-07 02:13:26,863 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:13:26,863 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-07 02:13:26,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:13:27,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:13:27,079 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:13:27,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:13:27,083 INFO L85 PathProgramCache]: Analyzing trace with hash 925766, now seen corresponding path program 1 times [2021-11-07 02:13:27,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:13:27,085 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [322696851] [2021-11-07 02:13:27,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:13:27,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:13:27,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:13:27,087 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:13:27,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 02:13:27,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:13:27,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:13:27,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:13:27,404 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-07 02:13:27,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 21 treesize of output 51 [2021-11-07 02:13:27,494 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:13:27,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:13:27,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:13:27,708 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:13:27,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [322696851] [2021-11-07 02:13:27,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [322696851] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:13:27,709 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:13:27,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 4 [2021-11-07 02:13:27,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929786516] [2021-11-07 02:13:27,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:13:27,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:13:27,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:13:27,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:13:27,712 INFO L87 Difference]: Start difference. First operand 148 states and 172 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:13:28,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:13:28,640 INFO L93 Difference]: Finished difference Result 353 states and 398 transitions. [2021-11-07 02:13:28,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 02:13:28,641 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-07 02:13:28,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:13:28,645 INFO L225 Difference]: With dead ends: 353 [2021-11-07 02:13:28,645 INFO L226 Difference]: Without dead ends: 353 [2021-11-07 02:13:28,646 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:13:28,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-07 02:13:28,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 219. [2021-11-07 02:13:28,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 168 states have (on average 1.6904761904761905) internal successors, (284), 218 states have internal predecessors, (284), 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) [2021-11-07 02:13:28,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 284 transitions. [2021-11-07 02:13:28,666 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 284 transitions. Word has length 4 [2021-11-07 02:13:28,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:13:28,666 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 284 transitions. [2021-11-07 02:13:28,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:13:28,667 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 284 transitions. [2021-11-07 02:13:28,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-07 02:13:28,667 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:13:28,667 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-07 02:13:28,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 02:13:28,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:13:28,874 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:13:28,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:13:28,874 INFO L85 PathProgramCache]: Analyzing trace with hash 28698698, now seen corresponding path program 1 times [2021-11-07 02:13:28,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:13:28,875 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [523630314] [2021-11-07 02:13:28,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:13:28,876 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:13:28,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:13:28,876 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:13:28,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 02:13:28,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:13:28,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 02:13:28,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:13:29,372 INFO L354 Elim1Store]: treesize reduction 479, result has 13.1 percent of original size [2021-11-07 02:13:29,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 12 case distinctions, treesize of input 300 treesize of output 342 [2021-11-07 02:13:29,413 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-07 02:13:29,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 342 treesize of output 338 [2021-11-07 02:13:35,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 105 [2021-11-07 02:13:37,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:13:37,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:13:37,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:13:37,443 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:13:37,443 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [523630314] [2021-11-07 02:13:37,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [523630314] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:13:37,444 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:13:37,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 6 [2021-11-07 02:13:37,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629085027] [2021-11-07 02:13:37,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:13:37,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:13:37,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:13:37,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:13:37,446 INFO L87 Difference]: Start difference. First operand 219 states and 284 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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) [2021-11-07 02:13:42,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:13:42,910 INFO L93 Difference]: Finished difference Result 449 states and 570 transitions. [2021-11-07 02:13:42,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:13:42,911 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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 5 [2021-11-07 02:13:42,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:13:42,916 INFO L225 Difference]: With dead ends: 449 [2021-11-07 02:13:42,916 INFO L226 Difference]: Without dead ends: 449 [2021-11-07 02:13:42,917 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:13:42,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2021-11-07 02:13:42,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 274. [2021-11-07 02:13:42,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 223 states have (on average 1.6681614349775784) internal successors, (372), 273 states have internal predecessors, (372), 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) [2021-11-07 02:13:42,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 372 transitions. [2021-11-07 02:13:42,944 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 372 transitions. Word has length 5 [2021-11-07 02:13:42,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:13:42,945 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 372 transitions. [2021-11-07 02:13:42,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 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) [2021-11-07 02:13:42,945 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 372 transitions. [2021-11-07 02:13:42,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 02:13:42,946 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:13:42,946 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 02:13:42,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 02:13:43,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:13:43,155 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:13:43,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:13:43,156 INFO L85 PathProgramCache]: Analyzing trace with hash 889659685, now seen corresponding path program 1 times [2021-11-07 02:13:43,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:13:43,157 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1687885463] [2021-11-07 02:13:43,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:13:43,158 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:13:43,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:13:43,159 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:13:43,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 02:13:43,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:13:43,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-07 02:13:43,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:13:43,630 INFO L354 Elim1Store]: treesize reduction 336, result has 13.8 percent of original size [2021-11-07 02:13:43,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 111 treesize of output 144 [2021-11-07 02:13:43,642 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-07 02:13:43,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 254 treesize of output 246 [2021-11-07 02:13:43,651 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 02:13:43,666 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-07 02:13:43,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 246 treesize of output 236 [2021-11-07 02:13:47,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 107 treesize of output 83 [2021-11-07 02:13:47,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 72 [2021-11-07 02:13:50,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:13:50,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:13:50,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:13:50,490 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:13:50,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1687885463] [2021-11-07 02:13:50,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1687885463] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:13:50,490 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:13:50,490 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 6 [2021-11-07 02:13:50,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522289620] [2021-11-07 02:13:50,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:13:50,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:13:50,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:13:50,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:13:50,492 INFO L87 Difference]: Start difference. First operand 274 states and 372 transitions. Second operand has 8 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) [2021-11-07 02:13:52,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:13:52,885 INFO L93 Difference]: Finished difference Result 586 states and 704 transitions. [2021-11-07 02:13:52,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 02:13:52,887 INFO L78 Accepts]: Start accepts. Automaton has has 8 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 6 [2021-11-07 02:13:52,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:13:52,891 INFO L225 Difference]: With dead ends: 586 [2021-11-07 02:13:52,891 INFO L226 Difference]: Without dead ends: 586 [2021-11-07 02:13:52,892 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:13:52,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2021-11-07 02:13:52,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 302. [2021-11-07 02:13:52,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 251 states have (on average 1.6374501992031874) internal successors, (411), 301 states have internal predecessors, (411), 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) [2021-11-07 02:13:52,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 411 transitions. [2021-11-07 02:13:52,910 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 411 transitions. Word has length 6 [2021-11-07 02:13:52,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:13:52,911 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 411 transitions. [2021-11-07 02:13:52,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 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) [2021-11-07 02:13:52,911 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 411 transitions. [2021-11-07 02:13:52,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-07 02:13:52,912 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:13:52,912 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:13:52,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 02:13:53,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:13:53,127 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:13:53,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:13:53,128 INFO L85 PathProgramCache]: Analyzing trace with hash 1809646508, now seen corresponding path program 1 times [2021-11-07 02:13:53,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:13:53,128 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [393683778] [2021-11-07 02:13:53,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:13:53,129 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:13:53,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:13:53,130 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:13:53,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 02:13:53,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:13:53,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 02:13:53,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:13:53,545 INFO L354 Elim1Store]: treesize reduction 351, result has 15.4 percent of original size [2021-11-07 02:13:53,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 7 case distinctions, treesize of input 82 treesize of output 124 [2021-11-07 02:13:53,555 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-07 02:13:53,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 124 treesize of output 120 [2021-11-07 02:14:00,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:14:00,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:14:00,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:14:00,252 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:14:00,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [393683778] [2021-11-07 02:14:00,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [393683778] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:14:00,253 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:14:00,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 4 [2021-11-07 02:14:00,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462683455] [2021-11-07 02:14:00,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:14:00,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:14:00,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:14:00,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:14:00,254 INFO L87 Difference]: Start difference. First operand 302 states and 411 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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) [2021-11-07 02:14:01,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:14:01,753 INFO L93 Difference]: Finished difference Result 405 states and 516 transitions. [2021-11-07 02:14:01,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 02:14:01,754 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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 7 [2021-11-07 02:14:01,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:14:01,756 INFO L225 Difference]: With dead ends: 405 [2021-11-07 02:14:01,757 INFO L226 Difference]: Without dead ends: 405 [2021-11-07 02:14:01,757 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:14:01,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2021-11-07 02:14:01,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 308. [2021-11-07 02:14:01,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 258 states have (on average 1.62015503875969) internal successors, (418), 307 states have internal predecessors, (418), 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) [2021-11-07 02:14:01,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 418 transitions. [2021-11-07 02:14:01,770 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 418 transitions. Word has length 7 [2021-11-07 02:14:01,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:14:01,770 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 418 transitions. [2021-11-07 02:14:01,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 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) [2021-11-07 02:14:01,771 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 418 transitions. [2021-11-07 02:14:01,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 02:14:01,771 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:14:01,772 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:14:01,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 02:14:01,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:14:01,975 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:14:01,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:14:01,975 INFO L85 PathProgramCache]: Analyzing trace with hash 264466951, now seen corresponding path program 1 times [2021-11-07 02:14:01,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:14:01,977 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1201806008] [2021-11-07 02:14:01,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:14:01,977 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:14:01,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:14:01,979 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:14:01,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 02:14:02,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:14:02,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 02:14:02,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:14:02,306 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-07 02:14:02,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 58 treesize of output 87 [2021-11-07 02:14:02,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 109 treesize of output 107 [2021-11-07 02:14:02,332 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 02:14:02,344 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-07 02:14:02,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 107 treesize of output 101 [2021-11-07 02:14:17,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:14:17,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:14:17,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:14:17,447 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:14:17,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1201806008] [2021-11-07 02:14:17,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1201806008] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:14:17,448 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:14:17,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 4 [2021-11-07 02:14:17,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229812549] [2021-11-07 02:14:17,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:14:17,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:14:17,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:14:17,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:14:17,450 INFO L87 Difference]: Start difference. First operand 308 states and 418 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:14:18,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:14:18,933 INFO L93 Difference]: Finished difference Result 437 states and 522 transitions. [2021-11-07 02:14:18,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 02:14:18,934 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-07 02:14:18,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:14:18,937 INFO L225 Difference]: With dead ends: 437 [2021-11-07 02:14:18,937 INFO L226 Difference]: Without dead ends: 437 [2021-11-07 02:14:18,938 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:14:18,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-11-07 02:14:18,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 310. [2021-11-07 02:14:18,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 261 states have (on average 1.5977011494252873) internal successors, (417), 309 states have internal predecessors, (417), 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) [2021-11-07 02:14:18,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 417 transitions. [2021-11-07 02:14:18,949 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 417 transitions. Word has length 8 [2021-11-07 02:14:18,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:14:18,949 INFO L470 AbstractCegarLoop]: Abstraction has 310 states and 417 transitions. [2021-11-07 02:14:18,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:14:18,950 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 417 transitions. [2021-11-07 02:14:18,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 02:14:18,951 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:14:18,951 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:14:18,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 02:14:19,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:14:19,163 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:14:19,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:14:19,164 INFO L85 PathProgramCache]: Analyzing trace with hash -319620029, now seen corresponding path program 1 times [2021-11-07 02:14:19,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:14:19,164 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1155076744] [2021-11-07 02:14:19,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:14:19,165 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:14:19,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:14:19,166 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:14:19,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 02:14:19,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:14:19,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:14:19,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:14:19,610 INFO L354 Elim1Store]: treesize reduction 483, result has 13.6 percent of original size [2021-11-07 02:14:19,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 7 case distinctions, treesize of input 151 treesize of output 197 [2021-11-07 02:14:19,623 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-11-07 02:14:19,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 197 treesize of output 193 [2021-11-07 02:14:35,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 126 treesize of output 106 [2021-11-07 02:14:36,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:14:36,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:14:37,282 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:14:37,283 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:14:37,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1155076744] [2021-11-07 02:14:37,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1155076744] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:14:37,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1626277898] [2021-11-07 02:14:37,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:14:37,284 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:14:37,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:14:37,288 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:14:37,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-07 02:14:37,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:14:37,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 02:14:37,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:14:38,145 INFO L354 Elim1Store]: treesize reduction 491, result has 13.4 percent of original size [2021-11-07 02:14:38,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 8 case distinctions, treesize of input 297 treesize of output 335 [2021-11-07 02:14:55,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 138 treesize of output 118 [2021-11-07 02:14:57,963 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:14:57,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:14:58,437 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:14:58,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1626277898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:14:58,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868229703] [2021-11-07 02:14:58,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:14:58,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:14:58,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:14:58,439 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:14:58,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-07 02:14:58,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:14:58,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 02:14:58,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:14:59,687 INFO L354 Elim1Store]: treesize reduction 507, result has 13.0 percent of original size [2021-11-07 02:14:59,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 11 case distinctions, treesize of input 311 treesize of output 349 [2021-11-07 02:14:59,842 INFO L354 Elim1Store]: treesize reduction 380, result has 7.8 percent of original size [2021-11-07 02:14:59,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 351 treesize of output 360 [2021-11-07 02:15:22,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 161 treesize of output 137 [2021-11-07 02:15:22,923 INFO L354 Elim1Store]: treesize reduction 100, result has 17.4 percent of original size [2021-11-07 02:15:22,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 134 treesize of output 140 [2021-11-07 02:15:25,713 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:15:25,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:15:26,265 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:15:26,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868229703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:15:26,266 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:15:26,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 4, 4] total 25 [2021-11-07 02:15:26,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836458040] [2021-11-07 02:15:26,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-07 02:15:26,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:15:26,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-07 02:15:26,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=558, Unknown=0, NotChecked=0, Total=702 [2021-11-07 02:15:26,268 INFO L87 Difference]: Start difference. First operand 310 states and 417 transitions. Second operand has 27 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 26 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:16:00,185 WARN L207 SmtUtils]: Spent 7.64 s on a formula simplification. DAG size of input: 139 DAG size of output: 107 [2021-11-07 02:16:33,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:16:33,088 INFO L93 Difference]: Finished difference Result 922 states and 1162 transitions. [2021-11-07 02:16:33,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-07 02:16:33,090 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 26 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-07 02:16:33,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:16:33,094 INFO L225 Difference]: With dead ends: 922 [2021-11-07 02:16:33,095 INFO L226 Difference]: Without dead ends: 922 [2021-11-07 02:16:33,096 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 48.1s TimeCoverageRelationStatistics Valid=445, Invalid=1532, Unknown=3, NotChecked=0, Total=1980 [2021-11-07 02:16:33,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 922 states. [2021-11-07 02:16:33,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 922 to 406. [2021-11-07 02:16:33,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 357 states have (on average 1.5658263305322129) internal successors, (559), 405 states have internal predecessors, (559), 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) [2021-11-07 02:16:33,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 559 transitions. [2021-11-07 02:16:33,111 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 559 transitions. Word has length 13 [2021-11-07 02:16:33,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:16:33,112 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 559 transitions. [2021-11-07 02:16:33,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 26 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:16:33,112 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 559 transitions. [2021-11-07 02:16:33,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-07 02:16:33,113 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:16:33,113 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:16:33,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 02:16:33,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-07 02:16:33,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-07 02:16:33,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:16:33,726 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:16:33,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:16:33,726 INFO L85 PathProgramCache]: Analyzing trace with hash -1318286260, now seen corresponding path program 1 times [2021-11-07 02:16:33,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:16:33,727 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [512668642] [2021-11-07 02:16:33,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:16:33,727 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:16:33,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:16:33,728 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:16:33,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 02:16:34,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:16:34,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:16:34,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:16:34,481 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-07 02:16:34,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 101 treesize of output 136 [2021-11-07 02:16:34,491 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-07 02:16:34,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 314 treesize of output 308 [2021-11-07 02:16:34,509 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-11-07 02:16:34,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 308 treesize of output 304 [2021-11-07 02:16:57,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 120 treesize of output 112 [2021-11-07 02:16:57,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 109 treesize of output 85 [2021-11-07 02:17:04,161 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:04,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:04,417 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:04,417 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:04,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [512668642] [2021-11-07 02:17:04,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [512668642] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:17:04,417 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [854139881] [2021-11-07 02:17:04,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:04,418 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:17:04,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:17:04,420 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:17:04,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-07 02:17:05,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:05,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 02:17:05,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:05,603 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-07 02:17:05,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 102 treesize of output 137 [2021-11-07 02:17:05,613 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-07 02:17:05,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 395 treesize of output 387 [2021-11-07 02:17:36,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 120 [2021-11-07 02:17:36,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 117 treesize of output 93 [2021-11-07 02:17:43,611 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:43,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:43,706 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:43,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [854139881] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:17:43,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083778248] [2021-11-07 02:17:43,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:43,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:17:43,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:17:43,708 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:17:43,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-07 02:17:44,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:44,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 02:17:44,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:44,501 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-07 02:17:44,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 52 treesize of output 87 [2021-11-07 02:17:44,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 129 treesize of output 127 [2021-11-07 02:17:46,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 71 [2021-11-07 02:17:46,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 52 [2021-11-07 02:17:47,494 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:47,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:48,151 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:48,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083778248] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:17:48,153 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:17:48,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 19 [2021-11-07 02:17:48,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058076975] [2021-11-07 02:17:48,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-07 02:17:48,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:48,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-07 02:17:48,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2021-11-07 02:17:48,155 INFO L87 Difference]: Start difference. First operand 406 states and 559 transitions. Second operand has 21 states, 20 states have (on average 3.4) internal successors, (68), 20 states have internal predecessors, (68), 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) [2021-11-07 02:18:04,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:04,978 INFO L93 Difference]: Finished difference Result 1090 states and 1318 transitions. [2021-11-07 02:18:04,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-07 02:18:04,979 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.4) internal successors, (68), 20 states have internal predecessors, (68), 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 14 [2021-11-07 02:18:04,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:04,985 INFO L225 Difference]: With dead ends: 1090 [2021-11-07 02:18:04,985 INFO L226 Difference]: Without dead ends: 1090 [2021-11-07 02:18:04,986 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=266, Invalid=856, Unknown=0, NotChecked=0, Total=1122 [2021-11-07 02:18:04,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1090 states. [2021-11-07 02:18:05,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1090 to 487. [2021-11-07 02:18:05,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 438 states have (on average 1.5319634703196348) internal successors, (671), 486 states have internal predecessors, (671), 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) [2021-11-07 02:18:05,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 671 transitions. [2021-11-07 02:18:05,005 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 671 transitions. Word has length 14 [2021-11-07 02:18:05,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:05,006 INFO L470 AbstractCegarLoop]: Abstraction has 487 states and 671 transitions. [2021-11-07 02:18:05,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.4) internal successors, (68), 20 states have internal predecessors, (68), 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) [2021-11-07 02:18:05,006 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 671 transitions. [2021-11-07 02:18:05,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-07 02:18:05,007 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:05,007 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:05,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:05,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:05,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:05,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:18:05,620 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:18:05,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:05,621 INFO L85 PathProgramCache]: Analyzing trace with hash -723310514, now seen corresponding path program 1 times [2021-11-07 02:18:05,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:05,621 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1499922649] [2021-11-07 02:18:05,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:05,622 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:05,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:05,623 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:05,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 02:18:06,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:06,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:18:06,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:06,227 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:06,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:06,255 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:06,255 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:06,255 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1499922649] [2021-11-07 02:18:06,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1499922649] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:06,255 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:18:06,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:18:06,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715902825] [2021-11-07 02:18:06,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:18:06,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:06,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:18:06,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:18:06,257 INFO L87 Difference]: Start difference. First operand 487 states and 671 transitions. Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:06,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:06,274 INFO L93 Difference]: Finished difference Result 534 states and 714 transitions. [2021-11-07 02:18:06,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:18:06,275 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-07 02:18:06,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:06,278 INFO L225 Difference]: With dead ends: 534 [2021-11-07 02:18:06,278 INFO L226 Difference]: Without dead ends: 534 [2021-11-07 02:18:06,278 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:18:06,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-11-07 02:18:06,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 352. [2021-11-07 02:18:06,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 321 states have (on average 1.485981308411215) internal successors, (477), 351 states have internal predecessors, (477), 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) [2021-11-07 02:18:06,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 477 transitions. [2021-11-07 02:18:06,290 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 477 transitions. Word has length 16 [2021-11-07 02:18:06,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:06,290 INFO L470 AbstractCegarLoop]: Abstraction has 352 states and 477 transitions. [2021-11-07 02:18:06,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:06,291 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 477 transitions. [2021-11-07 02:18:06,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 02:18:06,291 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:06,292 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:06,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:06,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:18:06,505 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:18:06,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:06,505 INFO L85 PathProgramCache]: Analyzing trace with hash -947173666, now seen corresponding path program 1 times [2021-11-07 02:18:06,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:06,506 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1085166123] [2021-11-07 02:18:06,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:06,507 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:06,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:06,509 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:06,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 02:18:07,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:07,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:18:07,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:07,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:07,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:07,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:07,240 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:07,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1085166123] [2021-11-07 02:18:07,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1085166123] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:07,240 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:18:07,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 02:18:07,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712123537] [2021-11-07 02:18:07,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:18:07,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:07,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:18:07,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:18:07,242 INFO L87 Difference]: Start difference. First operand 352 states and 477 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 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) [2021-11-07 02:18:07,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:07,301 INFO L93 Difference]: Finished difference Result 430 states and 562 transitions. [2021-11-07 02:18:07,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:18:07,302 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-07 02:18:07,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:07,305 INFO L225 Difference]: With dead ends: 430 [2021-11-07 02:18:07,305 INFO L226 Difference]: Without dead ends: 430 [2021-11-07 02:18:07,305 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:18:07,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-11-07 02:18:07,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 410. [2021-11-07 02:18:07,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 410 states, 383 states have (on average 1.4543080939947781) internal successors, (557), 409 states have internal predecessors, (557), 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) [2021-11-07 02:18:07,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 557 transitions. [2021-11-07 02:18:07,316 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 557 transitions. Word has length 17 [2021-11-07 02:18:07,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:07,316 INFO L470 AbstractCegarLoop]: Abstraction has 410 states and 557 transitions. [2021-11-07 02:18:07,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 2 states have internal predecessors, (17), 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) [2021-11-07 02:18:07,317 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 557 transitions. [2021-11-07 02:18:07,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-07 02:18:07,318 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:07,318 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1] [2021-11-07 02:18:07,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:07,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:18:07,543 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:18:07,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:07,543 INFO L85 PathProgramCache]: Analyzing trace with hash -473015532, now seen corresponding path program 1 times [2021-11-07 02:18:07,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:07,544 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [721852846] [2021-11-07 02:18:07,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:07,544 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:07,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:07,545 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:07,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 02:18:08,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:08,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:18:08,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:08,281 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:08,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:08,375 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:08,375 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:08,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [721852846] [2021-11-07 02:18:08,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [721852846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:18:08,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2087509119] [2021-11-07 02:18:08,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:08,376 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:18:08,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:18:08,387 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:18:08,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 02:18:09,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:09,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:18:09,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:09,292 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:09,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:09,355 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:09,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2087509119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:18:09,355 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494297914] [2021-11-07 02:18:09,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:09,356 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:18:09,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:18:09,364 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:18:09,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-07 02:18:10,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:10,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:18:10,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:10,087 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:10,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:10,168 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:10,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494297914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:18:10,169 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:18:10,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-07 02:18:10,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333725607] [2021-11-07 02:18:10,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:18:10,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:10,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:18:10,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:18:10,171 INFO L87 Difference]: Start difference. First operand 410 states and 557 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 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) [2021-11-07 02:18:10,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:10,506 INFO L93 Difference]: Finished difference Result 351 states and 423 transitions. [2021-11-07 02:18:10,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:18:10,507 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 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 20 [2021-11-07 02:18:10,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:10,508 INFO L225 Difference]: With dead ends: 351 [2021-11-07 02:18:10,508 INFO L226 Difference]: Without dead ends: 351 [2021-11-07 02:18:10,509 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:18:10,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2021-11-07 02:18:10,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 253. [2021-11-07 02:18:10,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 235 states have (on average 1.3404255319148937) internal successors, (315), 252 states have internal predecessors, (315), 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) [2021-11-07 02:18:10,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 315 transitions. [2021-11-07 02:18:10,515 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 315 transitions. Word has length 20 [2021-11-07 02:18:10,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:10,516 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 315 transitions. [2021-11-07 02:18:10,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 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) [2021-11-07 02:18:10,516 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 315 transitions. [2021-11-07 02:18:10,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-07 02:18:10,517 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:10,517 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:10,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:10,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:10,941 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-07 02:18:11,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:18:11,139 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr23ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:18:11,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:11,139 INFO L85 PathProgramCache]: Analyzing trace with hash -1274183519, now seen corresponding path program 1 times [2021-11-07 02:18:11,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:11,140 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1609643263] [2021-11-07 02:18:11,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:11,140 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:11,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:11,145 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:11,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-07 02:18:11,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:11,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:18:11,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:11,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-07 02:18:11,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:11,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:12,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:12,196 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:12,196 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1609643263] [2021-11-07 02:18:12,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1609643263] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:12,196 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:18:12,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2021-11-07 02:18:12,196 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393089720] [2021-11-07 02:18:12,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:18:12,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:12,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:18:12,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:18:12,198 INFO L87 Difference]: Start difference. First operand 253 states and 315 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 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) [2021-11-07 02:18:12,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:12,625 INFO L93 Difference]: Finished difference Result 472 states and 567 transitions. [2021-11-07 02:18:12,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 02:18:12,627 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 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 [2021-11-07 02:18:12,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:12,630 INFO L225 Difference]: With dead ends: 472 [2021-11-07 02:18:12,630 INFO L226 Difference]: Without dead ends: 472 [2021-11-07 02:18:12,630 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:18:12,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-11-07 02:18:12,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 272. [2021-11-07 02:18:12,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 254 states have (on average 1.3188976377952757) internal successors, (335), 271 states have internal predecessors, (335), 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) [2021-11-07 02:18:12,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 335 transitions. [2021-11-07 02:18:12,638 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 335 transitions. Word has length 22 [2021-11-07 02:18:12,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:12,638 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 335 transitions. [2021-11-07 02:18:12,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 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) [2021-11-07 02:18:12,639 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 335 transitions. [2021-11-07 02:18:12,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-07 02:18:12,640 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:12,640 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:12,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:12,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:18:12,841 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr23ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:18:12,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:12,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1727901217, now seen corresponding path program 1 times [2021-11-07 02:18:12,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:12,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1135975193] [2021-11-07 02:18:12,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:12,842 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:12,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:12,842 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:12,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 02:18:13,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:13,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:18:13,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:13,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:13,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:13,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:13,515 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:13,516 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1135975193] [2021-11-07 02:18:13,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1135975193] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:13,516 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:18:13,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:18:13,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294779913] [2021-11-07 02:18:13,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:18:13,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:13,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:18:13,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:18:13,517 INFO L87 Difference]: Start difference. First operand 272 states and 335 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:13,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:13,545 INFO L93 Difference]: Finished difference Result 229 states and 267 transitions. [2021-11-07 02:18:13,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:18:13,546 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-07 02:18:13,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:13,548 INFO L225 Difference]: With dead ends: 229 [2021-11-07 02:18:13,548 INFO L226 Difference]: Without dead ends: 229 [2021-11-07 02:18:13,548 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:18:13,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-11-07 02:18:13,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 218. [2021-11-07 02:18:13,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 200 states have (on average 1.305) internal successors, (261), 217 states have internal predecessors, (261), 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) [2021-11-07 02:18:13,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 261 transitions. [2021-11-07 02:18:13,553 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 261 transitions. Word has length 22 [2021-11-07 02:18:13,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:13,554 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 261 transitions. [2021-11-07 02:18:13,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:13,554 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 261 transitions. [2021-11-07 02:18:13,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-07 02:18:13,555 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:13,555 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:13,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:13,783 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:18:13,784 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr23ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:18:13,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:13,784 INFO L85 PathProgramCache]: Analyzing trace with hash -1759672387, now seen corresponding path program 1 times [2021-11-07 02:18:13,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:13,785 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [105704433] [2021-11-07 02:18:13,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:13,785 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:13,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:13,786 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:13,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 02:18:14,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:14,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:18:14,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:14,741 INFO L354 Elim1Store]: treesize reduction 351, result has 15.4 percent of original size [2021-11-07 02:18:14,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 7 case distinctions, treesize of input 103 treesize of output 143 [2021-11-07 02:18:29,019 INFO L354 Elim1Store]: treesize reduction 175, result has 42.1 percent of original size [2021-11-07 02:18:29,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 105 treesize of output 216 [2021-11-07 02:19:19,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:19,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:19,358 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:19,358 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:19:19,358 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [105704433] [2021-11-07 02:19:19,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [105704433] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:19:19,358 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:19:19,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [] total 7 [2021-11-07 02:19:19,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222563541] [2021-11-07 02:19:19,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 02:19:19,359 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:19:19,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 02:19:19,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:19:19,360 INFO L87 Difference]: Start difference. First operand 218 states and 261 transitions. Second operand has 9 states, 8 states have (on average 6.0) internal successors, (48), 8 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) [2021-11-07 02:19:20,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:19:20,250 INFO L93 Difference]: Finished difference Result 253 states and 287 transitions. [2021-11-07 02:19:20,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:19:20,250 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 6.0) internal successors, (48), 8 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 24 [2021-11-07 02:19:20,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:19:20,252 INFO L225 Difference]: With dead ends: 253 [2021-11-07 02:19:20,252 INFO L226 Difference]: Without dead ends: 253 [2021-11-07 02:19:20,252 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:19:20,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-11-07 02:19:20,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 217. [2021-11-07 02:19:20,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 200 states have (on average 1.295) internal successors, (259), 216 states have internal predecessors, (259), 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) [2021-11-07 02:19:20,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 259 transitions. [2021-11-07 02:19:20,257 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 259 transitions. Word has length 24 [2021-11-07 02:19:20,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:19:20,258 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 259 transitions. [2021-11-07 02:19:20,258 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 6.0) internal successors, (48), 8 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) [2021-11-07 02:19:20,258 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 259 transitions. [2021-11-07 02:19:20,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-07 02:19:20,259 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:19:20,260 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:19:20,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:19:20,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:19:20,471 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:19:20,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:19:20,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1284730989, now seen corresponding path program 1 times [2021-11-07 02:19:20,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:19:20,471 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2145959275] [2021-11-07 02:19:20,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:20,472 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:19:20,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:19:20,472 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:19:20,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-07 02:19:21,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:21,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 02:19:21,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:21,649 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-07 02:19:21,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 68 treesize of output 97 [2021-11-07 02:19:21,870 INFO L354 Elim1Store]: treesize reduction 351, result has 15.4 percent of original size [2021-11-07 02:19:21,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 7 case distinctions, treesize of input 124 treesize of output 166 [2021-11-07 02:20:26,271 INFO L354 Elim1Store]: treesize reduction 134, result has 40.4 percent of original size [2021-11-07 02:20:26,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 157 treesize of output 231 [2021-11-07 02:20:26,447 INFO L354 Elim1Store]: treesize reduction 204, result has 13.2 percent of original size [2021-11-07 02:20:26,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 228 treesize of output 245 [2021-11-07 02:20:51,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:20:51,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:20:53,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:20:53,951 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:20:53,951 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2145959275] [2021-11-07 02:20:53,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2145959275] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:20:53,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:20:53,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 6 [2021-11-07 02:20:53,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555638838] [2021-11-07 02:20:53,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:20:53,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:20:53,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:20:53,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=37, Unknown=1, NotChecked=0, Total=56 [2021-11-07 02:20:53,952 INFO L87 Difference]: Start difference. First operand 217 states and 259 transitions. Second operand has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 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) [2021-11-07 02:21:07,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:07,073 INFO L93 Difference]: Finished difference Result 288 states and 324 transitions. [2021-11-07 02:21:07,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 02:21:07,074 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 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 25 [2021-11-07 02:21:07,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:07,075 INFO L225 Difference]: With dead ends: 288 [2021-11-07 02:21:07,076 INFO L226 Difference]: Without dead ends: 288 [2021-11-07 02:21:07,076 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=69, Invalid=111, Unknown=2, NotChecked=0, Total=182 [2021-11-07 02:21:07,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-11-07 02:21:07,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 216. [2021-11-07 02:21:07,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 200 states have (on average 1.285) internal successors, (257), 215 states have internal predecessors, (257), 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) [2021-11-07 02:21:07,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 257 transitions. [2021-11-07 02:21:07,082 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 257 transitions. Word has length 25 [2021-11-07 02:21:07,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:07,082 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 257 transitions. [2021-11-07 02:21:07,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 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) [2021-11-07 02:21:07,083 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 257 transitions. [2021-11-07 02:21:07,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-07 02:21:07,084 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:07,084 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:21:07,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:07,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:07,310 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2021-11-07 02:21:07,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:07,310 INFO L85 PathProgramCache]: Analyzing trace with hash -219537710, now seen corresponding path program 1 times [2021-11-07 02:21:07,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:07,311 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1349631053] [2021-11-07 02:21:07,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:07,311 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:07,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:07,312 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:07,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ef87d495-6d06-4b2e-aac9-d2d28dbbe41b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 02:21:08,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:08,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-07 02:21:08,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:08,633 INFO L354 Elim1Store]: treesize reduction 354, result has 14.1 percent of original size [2021-11-07 02:21:08,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 5 case distinctions, treesize of input 103 treesize of output 138 [2021-11-07 02:21:08,643 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-07 02:21:08,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 305 treesize of output 295 [2021-11-07 02:21:08,667 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-11-07 02:21:08,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 295 treesize of output 291 [2021-11-07 02:21:37,647 INFO L354 Elim1Store]: treesize reduction 176, result has 39.1 percent of original size [2021-11-07 02:21:37,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 115 treesize of output 208