./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/verifythis/elimination_max_rec_onepoint.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version b2eff8ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/elimination_max_rec_onepoint.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 3a80fea07b3dad363ac033c87feb8bfcf28a57d2e75bc95b67f90908b133efe1 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-b2eff8b [2021-10-29 05:08:41,123 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-29 05:08:41,126 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-29 05:08:41,159 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-29 05:08:41,160 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-29 05:08:41,162 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-29 05:08:41,164 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-29 05:08:41,167 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-29 05:08:41,169 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-29 05:08:41,171 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-29 05:08:41,172 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-29 05:08:41,174 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-29 05:08:41,175 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-29 05:08:41,176 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-29 05:08:41,178 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-29 05:08:41,180 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-29 05:08:41,182 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-29 05:08:41,183 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-29 05:08:41,186 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-29 05:08:41,189 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-29 05:08:41,191 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-29 05:08:41,193 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-29 05:08:41,195 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-29 05:08:41,197 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-29 05:08:41,201 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-29 05:08:41,202 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-29 05:08:41,202 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-29 05:08:41,204 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-29 05:08:41,204 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-29 05:08:41,206 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-29 05:08:41,207 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-29 05:08:41,208 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-29 05:08:41,209 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-29 05:08:41,210 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-29 05:08:41,211 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-29 05:08:41,212 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-29 05:08:41,213 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-29 05:08:41,213 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-29 05:08:41,213 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-29 05:08:41,214 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-29 05:08:41,215 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-29 05:08:41,216 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-10-29 05:08:41,242 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-29 05:08:41,242 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-29 05:08:41,243 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-29 05:08:41,244 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-29 05:08:41,244 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-29 05:08:41,244 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-29 05:08:41,245 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-29 05:08:41,245 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-29 05:08:41,245 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-29 05:08:41,245 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-29 05:08:41,245 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-29 05:08:41,246 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-29 05:08:41,246 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-29 05:08:41,246 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-29 05:08:41,246 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-29 05:08:41,247 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-29 05:08:41,248 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-29 05:08:41,248 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-29 05:08:41,248 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-29 05:08:41,248 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-29 05:08:41,249 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-29 05:08:41,249 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-29 05:08:41,249 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-29 05:08:41,249 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-29 05:08:41,250 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-29 05:08:41,250 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-29 05:08:41,250 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-29 05:08:41,250 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-29 05:08:41,251 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-29 05:08:41,251 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-29 05:08:41,251 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-29 05:08:41,251 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-29 05:08:41,252 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-29 05:08:41,252 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-29 05:08:41,252 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-29 05:08:41,252 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-29 05:08:41,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-29 05:08:41,253 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-29 05:08:41,253 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-29 05:08:41,253 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_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3a80fea07b3dad363ac033c87feb8bfcf28a57d2e75bc95b67f90908b133efe1 [2021-10-29 05:08:41,594 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-29 05:08:41,628 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-29 05:08:41,631 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-29 05:08:41,632 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-29 05:08:41,637 INFO L275 PluginConnector]: CDTParser initialized [2021-10-29 05:08:41,638 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/../../sv-benchmarks/c/verifythis/elimination_max_rec_onepoint.c [2021-10-29 05:08:41,720 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/data/3e09ad7ce/3759c40b00a6464bb0386993864ee361/FLAG2d74f5caa [2021-10-29 05:08:42,307 INFO L306 CDTParser]: Found 1 translation units. [2021-10-29 05:08:42,308 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/sv-benchmarks/c/verifythis/elimination_max_rec_onepoint.c [2021-10-29 05:08:42,328 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/data/3e09ad7ce/3759c40b00a6464bb0386993864ee361/FLAG2d74f5caa [2021-10-29 05:08:42,653 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/data/3e09ad7ce/3759c40b00a6464bb0386993864ee361 [2021-10-29 05:08:42,664 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-29 05:08:42,667 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-29 05:08:42,685 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-29 05:08:42,685 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-29 05:08:42,688 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-29 05:08:42,689 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.10 05:08:42" (1/1) ... [2021-10-29 05:08:42,690 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b01cf34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:42, skipping insertion in model container [2021-10-29 05:08:42,690 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.10 05:08:42" (1/1) ... [2021-10-29 05:08:42,700 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-29 05:08:42,721 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-29 05:08:42,898 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/sv-benchmarks/c/verifythis/elimination_max_rec_onepoint.c[502,515] [2021-10-29 05:08:42,945 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-29 05:08:42,961 INFO L203 MainTranslator]: Completed pre-run [2021-10-29 05:08:42,977 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/sv-benchmarks/c/verifythis/elimination_max_rec_onepoint.c[502,515] [2021-10-29 05:08:42,988 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-29 05:08:43,005 INFO L208 MainTranslator]: Completed translation [2021-10-29 05:08:43,005 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43 WrapperNode [2021-10-29 05:08:43,006 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-29 05:08:43,007 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-29 05:08:43,007 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-29 05:08:43,007 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-29 05:08:43,016 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,025 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,056 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-29 05:08:43,057 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-29 05:08:43,057 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-29 05:08:43,057 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-29 05:08:43,069 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,070 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,078 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,079 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,103 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,106 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,107 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,110 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-29 05:08:43,111 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-29 05:08:43,111 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-29 05:08:43,112 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-29 05:08:43,121 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (1/1) ... [2021-10-29 05:08:43,129 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-29 05:08:43,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:08:43,154 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-29 05:08:43,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-29 05:08:43,207 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-29 05:08:43,207 INFO L130 BoogieDeclarations]: Found specification of procedure check [2021-10-29 05:08:43,208 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2021-10-29 05:08:43,209 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-29 05:08:43,209 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-29 05:08:43,209 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-29 05:08:43,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-29 05:08:43,209 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-29 05:08:43,209 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-29 05:08:43,839 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-29 05:08:43,840 INFO L299 CfgBuilder]: Removed 18 assume(true) statements. [2021-10-29 05:08:43,842 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.10 05:08:43 BoogieIcfgContainer [2021-10-29 05:08:43,842 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-29 05:08:43,844 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-29 05:08:43,844 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-29 05:08:43,863 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-29 05:08:43,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.10 05:08:42" (1/3) ... [2021-10-29 05:08:43,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70578295 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.10 05:08:43, skipping insertion in model container [2021-10-29 05:08:43,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.10 05:08:43" (2/3) ... [2021-10-29 05:08:43,865 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70578295 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.10 05:08:43, skipping insertion in model container [2021-10-29 05:08:43,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.10 05:08:43" (3/3) ... [2021-10-29 05:08:43,867 INFO L111 eAbstractionObserver]: Analyzing ICFG elimination_max_rec_onepoint.c [2021-10-29 05:08:43,872 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-29 05:08:43,872 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-10-29 05:08:43,942 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-29 05:08:43,950 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 [2021-10-29 05:08:43,950 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-10-29 05:08:43,966 INFO L276 IsEmpty]: Start isEmpty. Operand has 47 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-29 05:08:43,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-29 05:08:43,975 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:43,976 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-29 05:08:43,977 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting checkErr0ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:43,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:43,983 INFO L85 PathProgramCache]: Analyzing trace with hash 150466673, now seen corresponding path program 1 times [2021-10-29 05:08:43,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:43,996 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321544367] [2021-10-29 05:08:43,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:43,997 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:44,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:44,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:44,306 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:44,306 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321544367] [2021-10-29 05:08:44,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321544367] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:44,307 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:44,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-29 05:08:44,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069849721] [2021-10-29 05:08:44,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-29 05:08:44,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:44,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-29 05:08:44,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-29 05:08:44,330 INFO L87 Difference]: Start difference. First operand has 47 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:44,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:44,443 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2021-10-29 05:08:44,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-29 05:08:44,445 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-10-29 05:08:44,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:44,498 INFO L225 Difference]: With dead ends: 75 [2021-10-29 05:08:44,498 INFO L226 Difference]: Without dead ends: 74 [2021-10-29 05:08:44,500 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-29 05:08:44,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-10-29 05:08:44,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 60. [2021-10-29 05:08:44,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 36 states have (on average 1.8055555555555556) internal successors, (65), 54 states have internal predecessors, (65), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:44,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 71 transitions. [2021-10-29 05:08:44,599 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 71 transitions. Word has length 6 [2021-10-29 05:08:44,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:44,600 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 71 transitions. [2021-10-29 05:08:44,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 4 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:44,601 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 71 transitions. [2021-10-29 05:08:44,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-29 05:08:44,601 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:44,601 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:44,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-29 05:08:44,602 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting checkErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:44,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:44,610 INFO L85 PathProgramCache]: Analyzing trace with hash 369505433, now seen corresponding path program 1 times [2021-10-29 05:08:44,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:44,610 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50154890] [2021-10-29 05:08:44,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:44,611 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:44,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:44,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:44,733 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:44,734 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50154890] [2021-10-29 05:08:44,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50154890] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:44,734 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:44,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-29 05:08:44,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549870328] [2021-10-29 05:08:44,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-29 05:08:44,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:44,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-29 05:08:44,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-29 05:08:44,740 INFO L87 Difference]: Start difference. First operand 60 states and 71 transitions. Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:44,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:44,850 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2021-10-29 05:08:44,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-29 05:08:44,852 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-10-29 05:08:44,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:44,855 INFO L225 Difference]: With dead ends: 53 [2021-10-29 05:08:44,855 INFO L226 Difference]: Without dead ends: 53 [2021-10-29 05:08:44,856 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-29 05:08:44,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-29 05:08:44,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-10-29 05:08:44,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.5) internal successors, (54), 47 states have internal predecessors, (54), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:44,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-10-29 05:08:44,876 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 7 [2021-10-29 05:08:44,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:44,877 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-10-29 05:08:44,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:44,879 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-10-29 05:08:44,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-29 05:08:44,880 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:44,881 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:44,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-29 05:08:44,884 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting checkErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:44,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:44,885 INFO L85 PathProgramCache]: Analyzing trace with hash 369505434, now seen corresponding path program 1 times [2021-10-29 05:08:44,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:44,885 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015632926] [2021-10-29 05:08:44,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:44,885 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:44,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:45,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:45,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:45,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015632926] [2021-10-29 05:08:45,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015632926] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:45,091 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:45,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-29 05:08:45,092 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548333224] [2021-10-29 05:08:45,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-29 05:08:45,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:45,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-29 05:08:45,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-29 05:08:45,097 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:45,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:45,268 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2021-10-29 05:08:45,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-29 05:08:45,269 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-10-29 05:08:45,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:45,271 INFO L225 Difference]: With dead ends: 59 [2021-10-29 05:08:45,272 INFO L226 Difference]: Without dead ends: 59 [2021-10-29 05:08:45,272 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-29 05:08:45,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-10-29 05:08:45,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 52. [2021-10-29 05:08:45,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 46 states have internal predecessors, (52), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:45,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2021-10-29 05:08:45,287 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 7 [2021-10-29 05:08:45,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:45,288 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2021-10-29 05:08:45,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:45,289 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2021-10-29 05:08:45,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-29 05:08:45,290 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:45,290 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:45,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-29 05:08:45,295 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:45,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:45,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1429953388, now seen corresponding path program 1 times [2021-10-29 05:08:45,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:45,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856168186] [2021-10-29 05:08:45,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:45,299 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:45,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:45,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:45,447 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:45,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856168186] [2021-10-29 05:08:45,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856168186] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:45,448 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:45,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-29 05:08:45,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250500583] [2021-10-29 05:08:45,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-29 05:08:45,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:45,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-29 05:08:45,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-29 05:08:45,450 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand has 4 states, 2 states have (on average 3.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:45,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:45,485 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-10-29 05:08:45,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-29 05:08:45,486 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 2 states have (on average 3.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 8 [2021-10-29 05:08:45,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:45,487 INFO L225 Difference]: With dead ends: 51 [2021-10-29 05:08:45,487 INFO L226 Difference]: Without dead ends: 51 [2021-10-29 05:08:45,487 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-29 05:08:45,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-10-29 05:08:45,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-10-29 05:08:45,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 45 states have internal predecessors, (51), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:45,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-10-29 05:08:45,493 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 8 [2021-10-29 05:08:45,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:45,493 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-10-29 05:08:45,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 2 states have (on average 3.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:45,494 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-10-29 05:08:45,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-29 05:08:45,494 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:45,495 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:45,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-29 05:08:45,495 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting checkErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:45,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:45,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1430233423, now seen corresponding path program 1 times [2021-10-29 05:08:45,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:45,496 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935533627] [2021-10-29 05:08:45,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:45,497 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:45,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:45,641 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:45,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:45,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935533627] [2021-10-29 05:08:45,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935533627] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:45,642 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:45,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-29 05:08:45,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033266721] [2021-10-29 05:08:45,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-29 05:08:45,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:45,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-29 05:08:45,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-10-29 05:08:45,645 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 7 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:45,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:45,857 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2021-10-29 05:08:45,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-29 05:08:45,858 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-10-29 05:08:45,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:45,859 INFO L225 Difference]: With dead ends: 57 [2021-10-29 05:08:45,860 INFO L226 Difference]: Without dead ends: 57 [2021-10-29 05:08:45,860 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-10-29 05:08:45,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-10-29 05:08:45,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-10-29 05:08:45,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.3888888888888888) internal successors, (50), 45 states have internal predecessors, (50), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:45,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 56 transitions. [2021-10-29 05:08:45,866 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 56 transitions. Word has length 8 [2021-10-29 05:08:45,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:45,866 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 56 transitions. [2021-10-29 05:08:45,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:45,867 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 56 transitions. [2021-10-29 05:08:45,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-29 05:08:45,868 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:45,868 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:45,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-29 05:08:45,868 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:45,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:45,869 INFO L85 PathProgramCache]: Analyzing trace with hash -1378879468, now seen corresponding path program 1 times [2021-10-29 05:08:45,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:45,870 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190666971] [2021-10-29 05:08:45,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:45,870 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:45,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:45,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:45,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:45,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190666971] [2021-10-29 05:08:45,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190666971] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:45,955 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:45,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-29 05:08:45,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948804681] [2021-10-29 05:08:45,956 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-29 05:08:45,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:45,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-29 05:08:45,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-10-29 05:08:45,957 INFO L87 Difference]: Start difference. First operand 51 states and 56 transitions. Second operand has 8 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:46,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:46,049 INFO L93 Difference]: Finished difference Result 67 states and 72 transitions. [2021-10-29 05:08:46,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-29 05:08:46,050 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-10-29 05:08:46,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:46,051 INFO L225 Difference]: With dead ends: 67 [2021-10-29 05:08:46,051 INFO L226 Difference]: Without dead ends: 67 [2021-10-29 05:08:46,051 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-10-29 05:08:46,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-10-29 05:08:46,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 56. [2021-10-29 05:08:46,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 40 states have (on average 1.35) internal successors, (54), 49 states have internal predecessors, (54), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-29 05:08:46,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2021-10-29 05:08:46,057 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 9 [2021-10-29 05:08:46,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:46,057 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2021-10-29 05:08:46,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:46,058 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2021-10-29 05:08:46,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-29 05:08:46,058 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:46,058 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:46,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-10-29 05:08:46,059 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:46,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:46,059 INFO L85 PathProgramCache]: Analyzing trace with hash 2041800706, now seen corresponding path program 1 times [2021-10-29 05:08:46,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:46,060 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495173336] [2021-10-29 05:08:46,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:46,060 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:46,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:46,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:46,136 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:46,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495173336] [2021-10-29 05:08:46,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495173336] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:46,137 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:46,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-10-29 05:08:46,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196659285] [2021-10-29 05:08:46,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-29 05:08:46,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:46,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-29 05:08:46,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-10-29 05:08:46,139 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:46,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:46,200 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2021-10-29 05:08:46,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-29 05:08:46,200 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-29 05:08:46,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:46,201 INFO L225 Difference]: With dead ends: 54 [2021-10-29 05:08:46,201 INFO L226 Difference]: Without dead ends: 54 [2021-10-29 05:08:46,202 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-29 05:08:46,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-10-29 05:08:46,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-10-29 05:08:46,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 47 states have internal predecessors, (52), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-29 05:08:46,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2021-10-29 05:08:46,207 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 11 [2021-10-29 05:08:46,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:46,207 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2021-10-29 05:08:46,207 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:46,208 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2021-10-29 05:08:46,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-29 05:08:46,208 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:46,209 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:46,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-10-29 05:08:46,209 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:46,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:46,210 INFO L85 PathProgramCache]: Analyzing trace with hash -1128683485, now seen corresponding path program 1 times [2021-10-29 05:08:46,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:46,210 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058391559] [2021-10-29 05:08:46,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:46,211 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:46,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:46,240 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:46,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:46,241 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058391559] [2021-10-29 05:08:46,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1058391559] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:46,241 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:46,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-29 05:08:46,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126149373] [2021-10-29 05:08:46,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-29 05:08:46,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:46,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-29 05:08:46,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-29 05:08:46,243 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:46,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:46,253 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2021-10-29 05:08:46,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-29 05:08:46,254 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-10-29 05:08:46,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:46,255 INFO L225 Difference]: With dead ends: 53 [2021-10-29 05:08:46,255 INFO L226 Difference]: Without dead ends: 53 [2021-10-29 05:08:46,255 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 [2021-10-29 05:08:46,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-29 05:08:46,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-10-29 05:08:46,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 46 states have internal predecessors, (51), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-29 05:08:46,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2021-10-29 05:08:46,260 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 12 [2021-10-29 05:08:46,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:46,260 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2021-10-29 05:08:46,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:46,261 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2021-10-29 05:08:46,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-29 05:08:46,262 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:46,262 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:46,262 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-10-29 05:08:46,262 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting checkErr0ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:46,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:46,263 INFO L85 PathProgramCache]: Analyzing trace with hash -350967501, now seen corresponding path program 1 times [2021-10-29 05:08:46,263 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:46,263 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010897203] [2021-10-29 05:08:46,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:46,264 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:46,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:46,422 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:46,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:46,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010897203] [2021-10-29 05:08:46,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010897203] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:08:46,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903490887] [2021-10-29 05:08:46,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:46,424 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:08:46,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:08:46,429 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:08:46,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-29 05:08:46,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:46,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-29 05:08:46,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:08:46,787 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 56 treesize of output 40 [2021-10-29 05:08:47,180 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:47,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:08:47,379 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 63 treesize of output 47 [2021-10-29 05:08:47,525 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-29 05:08:47,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903490887] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:08:47,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1305304859] [2021-10-29 05:08:47,554 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-10-29 05:08:47,555 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:08:47,563 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:08:47,565 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:08:47,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 5] total 14 [2021-10-29 05:08:47,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317266925] [2021-10-29 05:08:47,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-29 05:08:47,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:47,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-29 05:08:47,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-10-29 05:08:47,573 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 10 states have internal predecessors, (23), 5 states have call successors, (5), 4 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:47,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:47,942 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2021-10-29 05:08:47,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-29 05:08:47,943 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 10 states have internal predecessors, (23), 5 states have call successors, (5), 4 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-10-29 05:08:47,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:47,944 INFO L225 Difference]: With dead ends: 57 [2021-10-29 05:08:47,944 INFO L226 Difference]: Without dead ends: 57 [2021-10-29 05:08:47,945 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2021-10-29 05:08:47,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-10-29 05:08:47,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-10-29 05:08:47,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 44 states have internal predecessors, (49), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-29 05:08:47,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 56 transitions. [2021-10-29 05:08:47,949 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 56 transitions. Word has length 13 [2021-10-29 05:08:47,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:47,949 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 56 transitions. [2021-10-29 05:08:47,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 10 states have internal predecessors, (23), 5 states have call successors, (5), 4 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:47,950 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 56 transitions. [2021-10-29 05:08:47,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-29 05:08:47,950 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:47,950 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:47,989 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-10-29 05:08:48,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-10-29 05:08:48,165 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting checkErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:48,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:48,165 INFO L85 PathProgramCache]: Analyzing trace with hash 2004915224, now seen corresponding path program 1 times [2021-10-29 05:08:48,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:48,165 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894725111] [2021-10-29 05:08:48,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:48,166 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:48,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:48,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:48,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:48,358 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894725111] [2021-10-29 05:08:48,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894725111] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:08:48,358 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430180225] [2021-10-29 05:08:48,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:48,358 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:08:48,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:08:48,359 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:08:48,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-29 05:08:48,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:48,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 32 conjunts are in the unsatisfiable core [2021-10-29 05:08:48,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:08:48,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 6 [2021-10-29 05:08:48,737 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 78 treesize of output 70 [2021-10-29 05:08:48,939 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:48,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:08:49,270 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 92 treesize of output 88 [2021-10-29 05:08:50,437 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:50,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430180225] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:08:50,437 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1535354078] [2021-10-29 05:08:50,439 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-29 05:08:50,440 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:08:50,440 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:08:50,440 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:08:50,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8] total 22 [2021-10-29 05:08:50,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780866386] [2021-10-29 05:08:50,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-29 05:08:50,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:50,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-29 05:08:50,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-10-29 05:08:50,442 INFO L87 Difference]: Start difference. First operand 51 states and 56 transitions. Second operand has 24 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:51,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:51,208 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2021-10-29 05:08:51,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-29 05:08:51,209 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-10-29 05:08:51,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:51,210 INFO L225 Difference]: With dead ends: 56 [2021-10-29 05:08:51,210 INFO L226 Difference]: Without dead ends: 56 [2021-10-29 05:08:51,211 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=229, Invalid=827, Unknown=0, NotChecked=0, Total=1056 [2021-10-29 05:08:51,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-10-29 05:08:51,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 50. [2021-10-29 05:08:51,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.263157894736842) internal successors, (48), 43 states have internal predecessors, (48), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-10-29 05:08:51,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-10-29 05:08:51,214 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 14 [2021-10-29 05:08:51,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:51,215 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-10-29 05:08:51,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:51,215 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-10-29 05:08:51,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-29 05:08:51,216 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:51,216 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:51,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-29 05:08:51,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:08:51,417 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:51,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:51,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1961899110, now seen corresponding path program 1 times [2021-10-29 05:08:51,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:51,417 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995582492] [2021-10-29 05:08:51,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:51,418 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:51,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:51,469 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:51,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:51,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995582492] [2021-10-29 05:08:51,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995582492] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-29 05:08:51,470 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-29 05:08:51,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-29 05:08:51,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306406346] [2021-10-29 05:08:51,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-29 05:08:51,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:51,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-29 05:08:51,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-29 05:08:51,472 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:51,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:51,503 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2021-10-29 05:08:51,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-29 05:08:51,503 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-10-29 05:08:51,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:51,504 INFO L225 Difference]: With dead ends: 49 [2021-10-29 05:08:51,505 INFO L226 Difference]: Without dead ends: 39 [2021-10-29 05:08:51,505 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-29 05:08:51,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-10-29 05:08:51,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-10-29 05:08:51,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 33 states have internal predecessors, (37), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:51,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-10-29 05:08:51,510 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 14 [2021-10-29 05:08:51,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:51,510 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-10-29 05:08:51,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-29 05:08:51,510 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-10-29 05:08:51,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-29 05:08:51,513 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:51,514 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:51,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-10-29 05:08:51,514 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting checkErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:51,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:51,515 INFO L85 PathProgramCache]: Analyzing trace with hash 2023113720, now seen corresponding path program 1 times [2021-10-29 05:08:51,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:51,515 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761736736] [2021-10-29 05:08:51,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:51,516 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:51,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:51,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:51,655 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:51,656 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761736736] [2021-10-29 05:08:51,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761736736] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:08:51,656 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712566614] [2021-10-29 05:08:51,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:51,656 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:08:51,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:08:51,669 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:08:51,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-29 05:08:51,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:51,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-29 05:08:51,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:08:52,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:52,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:08:52,172 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 29 treesize of output 25 [2021-10-29 05:08:52,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:52,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712566614] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:08:52,465 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [507551786] [2021-10-29 05:08:52,468 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-10-29 05:08:52,468 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:08:52,468 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:08:52,470 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:08:52,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 15 [2021-10-29 05:08:52,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812824022] [2021-10-29 05:08:52,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-29 05:08:52,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:52,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-29 05:08:52,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-10-29 05:08:52,472 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 16 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:52,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:52,721 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2021-10-29 05:08:52,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-29 05:08:52,722 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 15 [2021-10-29 05:08:52,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:52,723 INFO L225 Difference]: With dead ends: 44 [2021-10-29 05:08:52,723 INFO L226 Difference]: Without dead ends: 44 [2021-10-29 05:08:52,724 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2021-10-29 05:08:52,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-10-29 05:08:52,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 39. [2021-10-29 05:08:52,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 33 states have internal predecessors, (36), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:52,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-10-29 05:08:52,727 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 15 [2021-10-29 05:08:52,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:52,728 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-10-29 05:08:52,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:52,728 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-10-29 05:08:52,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-29 05:08:52,729 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:52,729 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2021-10-29 05:08:52,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-29 05:08:52,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-10-29 05:08:52,941 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting checkErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:52,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:52,941 INFO L85 PathProgramCache]: Analyzing trace with hash 2022829811, now seen corresponding path program 1 times [2021-10-29 05:08:52,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:52,941 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846360482] [2021-10-29 05:08:52,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:52,941 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:52,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:53,141 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:53,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:53,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846360482] [2021-10-29 05:08:53,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846360482] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:08:53,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729175095] [2021-10-29 05:08:53,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:53,142 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:08:53,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:08:53,144 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:08:53,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-29 05:08:53,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:53,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 25 conjunts are in the unsatisfiable core [2021-10-29 05:08:53,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:08:53,596 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:53,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:08:54,082 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 57 treesize of output 51 [2021-10-29 05:08:54,196 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:54,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729175095] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:08:54,196 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399542215] [2021-10-29 05:08:54,200 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-29 05:08:54,201 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:08:54,201 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:08:54,202 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:08:54,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 22 [2021-10-29 05:08:54,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743166202] [2021-10-29 05:08:54,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-10-29 05:08:54,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:54,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-10-29 05:08:54,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2021-10-29 05:08:54,210 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 23 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 17 states have internal predecessors, (38), 5 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:55,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:55,266 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2021-10-29 05:08:55,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-29 05:08:55,267 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 17 states have internal predecessors, (38), 5 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-10-29 05:08:55,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:55,268 INFO L225 Difference]: With dead ends: 63 [2021-10-29 05:08:55,268 INFO L226 Difference]: Without dead ends: 63 [2021-10-29 05:08:55,269 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=252, Invalid=1008, Unknown=0, NotChecked=0, Total=1260 [2021-10-29 05:08:55,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-10-29 05:08:55,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 52. [2021-10-29 05:08:55,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 44 states have internal predecessors, (51), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-29 05:08:55,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2021-10-29 05:08:55,274 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 15 [2021-10-29 05:08:55,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:55,274 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2021-10-29 05:08:55,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 1.8095238095238095) internal successors, (38), 17 states have internal predecessors, (38), 5 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-29 05:08:55,275 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2021-10-29 05:08:55,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-29 05:08:55,276 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:55,276 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:55,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-29 05:08:55,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-10-29 05:08:55,496 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting checkErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:55,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:55,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1707983288, now seen corresponding path program 1 times [2021-10-29 05:08:55,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:55,497 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325721337] [2021-10-29 05:08:55,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:55,497 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:55,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:55,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:55,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:55,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325721337] [2021-10-29 05:08:55,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325721337] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:08:55,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947176152] [2021-10-29 05:08:55,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:55,737 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:08:55,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:08:55,737 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:08:55,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-29 05:08:55,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:55,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 20 conjunts are in the unsatisfiable core [2021-10-29 05:08:55,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:08:56,090 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 64 treesize of output 48 [2021-10-29 05:08:56,517 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:56,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:08:56,872 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 82 treesize of output 66 [2021-10-29 05:08:56,876 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 66 treesize of output 62 [2021-10-29 05:08:57,084 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:57,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947176152] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:08:57,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1209976034] [2021-10-29 05:08:57,086 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-10-29 05:08:57,087 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:08:57,087 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:08:57,088 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:08:57,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 29 [2021-10-29 05:08:57,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851781625] [2021-10-29 05:08:57,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-10-29 05:08:57,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:08:57,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-10-29 05:08:57,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=774, Unknown=0, NotChecked=0, Total=870 [2021-10-29 05:08:57,091 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 30 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 22 states have internal predecessors, (38), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:58,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:08:58,219 INFO L93 Difference]: Finished difference Result 85 states and 94 transitions. [2021-10-29 05:08:58,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-29 05:08:58,221 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 22 states have internal predecessors, (38), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 16 [2021-10-29 05:08:58,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:08:58,222 INFO L225 Difference]: With dead ends: 85 [2021-10-29 05:08:58,222 INFO L226 Difference]: Without dead ends: 85 [2021-10-29 05:08:58,223 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=351, Invalid=1905, Unknown=0, NotChecked=0, Total=2256 [2021-10-29 05:08:58,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-10-29 05:08:58,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 65. [2021-10-29 05:08:58,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 54 states have internal predecessors, (64), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-29 05:08:58,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-10-29 05:08:58,229 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 16 [2021-10-29 05:08:58,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:08:58,229 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-10-29 05:08:58,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 22 states have internal predecessors, (38), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:08:58,230 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-10-29 05:08:58,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-29 05:08:58,230 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:08:58,230 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:08:58,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-29 05:08:58,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:08:58,453 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting checkErr9ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:08:58,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:08:58,453 INFO L85 PathProgramCache]: Analyzing trace with hash -694413414, now seen corresponding path program 1 times [2021-10-29 05:08:58,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:08:58,453 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387883391] [2021-10-29 05:08:58,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:58,453 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:08:58,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:58,550 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:08:58,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:08:58,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387883391] [2021-10-29 05:08:58,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387883391] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:08:58,551 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113298426] [2021-10-29 05:08:58,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:08:58,551 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:08:58,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:08:58,552 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:08:58,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-29 05:08:58,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:08:58,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-29 05:08:58,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:08:58,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 6 [2021-10-29 05:09:00,793 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_check_~a.base_BEFORE_CALL_7 Int)) (= ((as const (Array Int Int)) 0) (select |c_#memory_int| v_check_~a.base_BEFORE_CALL_7))) is different from true [2021-10-29 05:09:00,917 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 47 treesize of output 41 [2021-10-29 05:09:00,989 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-10-29 05:09:00,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:09:13,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:09:13,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113298426] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:09:13,202 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [387492683] [2021-10-29 05:09:13,204 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-10-29 05:09:13,204 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:09:13,205 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:09:13,206 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:09:13,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 15 [2021-10-29 05:09:13,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441165032] [2021-10-29 05:09:13,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-29 05:09:13,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:09:13,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-29 05:09:13,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=144, Unknown=6, NotChecked=24, Total=210 [2021-10-29 05:09:13,208 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 15 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-29 05:09:13,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:09:13,386 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2021-10-29 05:09:13,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-29 05:09:13,387 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 18 [2021-10-29 05:09:13,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:09:13,389 INFO L225 Difference]: With dead ends: 63 [2021-10-29 05:09:13,389 INFO L226 Difference]: Without dead ends: 63 [2021-10-29 05:09:13,390 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=80, Invalid=224, Unknown=6, NotChecked=32, Total=342 [2021-10-29 05:09:13,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-10-29 05:09:13,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-10-29 05:09:13,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 51 states have (on average 1.1764705882352942) internal successors, (60), 52 states have internal predecessors, (60), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-29 05:09:13,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-10-29 05:09:13,395 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 18 [2021-10-29 05:09:13,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:09:13,395 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-10-29 05:09:13,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 13 states have internal predecessors, (32), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-29 05:09:13,396 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-10-29 05:09:13,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-29 05:09:13,397 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:09:13,397 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:09:13,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-29 05:09:13,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-10-29 05:09:13,624 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting checkErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:09:13,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:09:13,625 INFO L85 PathProgramCache]: Analyzing trace with hash 519062902, now seen corresponding path program 2 times [2021-10-29 05:09:13,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:09:13,625 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820919539] [2021-10-29 05:09:13,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:09:13,625 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:09:13,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:09:13,892 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-29 05:09:13,892 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:09:13,892 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820919539] [2021-10-29 05:09:13,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820919539] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:09:13,893 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954925753] [2021-10-29 05:09:13,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-29 05:09:13,893 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:09:13,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:09:13,894 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:09:13,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-29 05:09:14,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-29 05:09:14,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-29 05:09:14,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 37 conjunts are in the unsatisfiable core [2021-10-29 05:09:14,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:09:14,187 INFO L354 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2021-10-29 05:09:14,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 50 [2021-10-29 05:09:14,807 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-29 05:09:14,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:09:15,023 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-29 05:09:15,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954925753] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:09:15,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1049986368] [2021-10-29 05:09:15,029 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-10-29 05:09:15,029 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:09:15,029 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:09:15,030 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:09:15,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4] total 15 [2021-10-29 05:09:15,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543663020] [2021-10-29 05:09:15,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-29 05:09:15,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:09:15,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-29 05:09:15,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-10-29 05:09:15,033 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 16 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:09:15,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:09:15,478 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2021-10-29 05:09:15,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-29 05:09:15,478 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-10-29 05:09:15,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:09:15,479 INFO L225 Difference]: With dead ends: 64 [2021-10-29 05:09:15,479 INFO L226 Difference]: Without dead ends: 64 [2021-10-29 05:09:15,480 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=146, Invalid=454, Unknown=0, NotChecked=0, Total=600 [2021-10-29 05:09:15,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-10-29 05:09:15,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2021-10-29 05:09:15,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 51 states have internal predecessors, (56), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-29 05:09:15,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2021-10-29 05:09:15,484 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 22 [2021-10-29 05:09:15,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:09:15,485 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2021-10-29 05:09:15,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-29 05:09:15,485 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2021-10-29 05:09:15,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-10-29 05:09:15,486 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:09:15,486 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:09:15,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-10-29 05:09:15,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-10-29 05:09:15,689 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:09:15,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:09:15,689 INFO L85 PathProgramCache]: Analyzing trace with hash 317135144, now seen corresponding path program 1 times [2021-10-29 05:09:15,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:09:15,689 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094307928] [2021-10-29 05:09:15,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:09:15,690 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:09:15,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:09:16,149 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-29 05:09:16,149 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:09:16,149 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094307928] [2021-10-29 05:09:16,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094307928] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:09:16,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784946914] [2021-10-29 05:09:16,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:09:16,150 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:09:16,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:09:16,152 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:09:16,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-29 05:09:16,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:09:16,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 20 conjunts are in the unsatisfiable core [2021-10-29 05:09:16,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:09:16,444 INFO L354 Elim1Store]: treesize reduction 78, result has 32.2 percent of original size [2021-10-29 05:09:16,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 3 case distinctions, treesize of input 17 treesize of output 44 [2021-10-29 05:09:17,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-29 05:09:17,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:09:17,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-29 05:09:17,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784946914] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:09:17,584 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399293812] [2021-10-29 05:09:17,591 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-10-29 05:09:17,591 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:09:17,592 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:09:17,593 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:09:17,593 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7, 6] total 26 [2021-10-29 05:09:17,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243618804] [2021-10-29 05:09:17,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-29 05:09:17,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:09:17,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-29 05:09:17,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=631, Unknown=0, NotChecked=0, Total=702 [2021-10-29 05:09:17,598 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 27 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-29 05:09:18,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:09:18,760 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2021-10-29 05:09:18,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-10-29 05:09:18,762 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 23 [2021-10-29 05:09:18,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:09:18,762 INFO L225 Difference]: With dead ends: 76 [2021-10-29 05:09:18,763 INFO L226 Difference]: Without dead ends: 57 [2021-10-29 05:09:18,764 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=218, Invalid=1504, Unknown=0, NotChecked=0, Total=1722 [2021-10-29 05:09:18,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-10-29 05:09:18,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 49. [2021-10-29 05:09:18,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-29 05:09:18,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-10-29 05:09:18,767 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 23 [2021-10-29 05:09:18,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:09:18,768 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-10-29 05:09:18,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-10-29 05:09:18,768 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-10-29 05:09:18,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-10-29 05:09:18,769 INFO L505 BasicCegarLoop]: Found error trace [2021-10-29 05:09:18,769 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:09:18,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-29 05:09:18,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-10-29 05:09:18,985 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting checkErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-10-29 05:09:18,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-29 05:09:18,985 INFO L85 PathProgramCache]: Analyzing trace with hash -44004644, now seen corresponding path program 1 times [2021-10-29 05:09:18,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-29 05:09:18,985 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092994717] [2021-10-29 05:09:18,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:09:18,986 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-29 05:09:19,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:09:19,413 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-29 05:09:19,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-29 05:09:19,414 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092994717] [2021-10-29 05:09:19,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092994717] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-29 05:09:19,414 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743010774] [2021-10-29 05:09:19,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-29 05:09:19,414 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:09:19,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 [2021-10-29 05:09:19,415 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-29 05:09:19,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-29 05:09:19,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-29 05:09:19,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-29 05:09:19,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-29 05:09:20,017 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-29 05:09:20,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-29 05:09:20,156 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-29 05:09:20,157 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 36 treesize of output 40 [2021-10-29 05:09:20,422 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-29 05:09:20,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743010774] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-29 05:09:20,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2075812902] [2021-10-29 05:09:20,425 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-10-29 05:09:20,425 INFO L166 IcfgInterpreter]: Building call graph [2021-10-29 05:09:20,425 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-29 05:09:20,425 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-29 05:09:20,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6, 6] total 24 [2021-10-29 05:09:20,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959768967] [2021-10-29 05:09:20,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-29 05:09:20,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-29 05:09:20,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-29 05:09:20,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=548, Unknown=0, NotChecked=0, Total=600 [2021-10-29 05:09:20,428 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 25 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 6 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-29 05:09:21,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-29 05:09:21,432 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-10-29 05:09:21,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-29 05:09:21,432 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 6 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 30 [2021-10-29 05:09:21,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-29 05:09:21,433 INFO L225 Difference]: With dead ends: 48 [2021-10-29 05:09:21,433 INFO L226 Difference]: Without dead ends: 0 [2021-10-29 05:09:21,434 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=224, Invalid=1416, Unknown=0, NotChecked=0, Total=1640 [2021-10-29 05:09:21,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-29 05:09:21,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-29 05:09:21,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 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) [2021-10-29 05:09:21,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-29 05:09:21,435 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 30 [2021-10-29 05:09:21,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-29 05:09:21,435 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-29 05:09:21,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 6 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-29 05:09:21,436 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-29 05:09:21,436 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-29 05:09:21,438 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATION [2021-10-29 05:09:21,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATION [2021-10-29 05:09:21,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATION [2021-10-29 05:09:21,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATION [2021-10-29 05:09:21,440 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK [2021-10-29 05:09:21,440 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_FREE [2021-10-29 05:09:21,440 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE [2021-10-29 05:09:21,440 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE [2021-10-29 05:09:21,440 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_LEAK [2021-10-29 05:09:21,441 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr0ASSERT_VIOLATIONMEMORY_LEAK [2021-10-29 05:09:21,441 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr1REQUIRES_VIOLATION [2021-10-29 05:09:21,441 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr2REQUIRES_VIOLATION [2021-10-29 05:09:21,441 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr3REQUIRES_VIOLATION [2021-10-29 05:09:21,441 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr4REQUIRES_VIOLATION [2021-10-29 05:09:21,442 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr5REQUIRES_VIOLATION [2021-10-29 05:09:21,442 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr6REQUIRES_VIOLATION [2021-10-29 05:09:21,442 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr7REQUIRES_VIOLATION [2021-10-29 05:09:21,442 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr8REQUIRES_VIOLATION [2021-10-29 05:09:21,442 INFO L764 garLoopResultBuilder]: Registering result SAFE for location checkErr9ASSERT_VIOLATIONMEMORY_LEAK [2021-10-29 05:09:21,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-29 05:09:21,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-29 05:09:21,668 INFO L731 BasicCegarLoop]: Path program histogram: [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-29 05:09:21,669 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-29 05:09:21,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.10 05:09:21 BoogieIcfgContainer [2021-10-29 05:09:21,672 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-29 05:09:21,673 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-29 05:09:21,673 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-29 05:09:21,673 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-29 05:09:21,674 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.10 05:08:43" (3/4) ... [2021-10-29 05:09:21,677 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-29 05:09:21,683 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure check [2021-10-29 05:09:21,693 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 28 nodes and edges [2021-10-29 05:09:21,693 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2021-10-29 05:09:21,693 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2021-10-29 05:09:21,694 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-29 05:09:21,729 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/witness.graphml [2021-10-29 05:09:21,730 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-29 05:09:21,731 INFO L168 Benchmark]: Toolchain (without parser) took 39063.82 ms. Allocated memory was 83.9 MB in the beginning and 239.1 MB in the end (delta: 155.2 MB). Free memory was 49.9 MB in the beginning and 177.2 MB in the end (delta: -127.2 MB). Peak memory consumption was 28.6 MB. Max. memory is 16.1 GB. [2021-10-29 05:09:21,731 INFO L168 Benchmark]: CDTParser took 1.03 ms. Allocated memory is still 83.9 MB. Free memory was 63.1 MB in the beginning and 63.1 MB in the end (delta: 21.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-29 05:09:21,731 INFO L168 Benchmark]: CACSL2BoogieTranslator took 321.48 ms. Allocated memory was 83.9 MB in the beginning and 123.7 MB in the end (delta: 39.8 MB). Free memory was 49.7 MB in the beginning and 99.8 MB in the end (delta: -50.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-29 05:09:21,732 INFO L168 Benchmark]: Boogie Procedure Inliner took 49.53 ms. Allocated memory is still 123.7 MB. Free memory was 99.8 MB in the beginning and 98.3 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-29 05:09:21,732 INFO L168 Benchmark]: Boogie Preprocessor took 53.39 ms. Allocated memory is still 123.7 MB. Free memory was 98.3 MB in the beginning and 97.2 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-29 05:09:21,733 INFO L168 Benchmark]: RCFGBuilder took 731.40 ms. Allocated memory is still 123.7 MB. Free memory was 97.2 MB in the beginning and 76.0 MB in the end (delta: 21.2 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. [2021-10-29 05:09:21,733 INFO L168 Benchmark]: TraceAbstraction took 37827.99 ms. Allocated memory was 123.7 MB in the beginning and 239.1 MB in the end (delta: 115.3 MB). Free memory was 76.0 MB in the beginning and 180.3 MB in the end (delta: -104.3 MB). Peak memory consumption was 12.4 MB. Max. memory is 16.1 GB. [2021-10-29 05:09:21,734 INFO L168 Benchmark]: Witness Printer took 57.01 ms. Allocated memory is still 239.1 MB. Free memory was 180.3 MB in the beginning and 177.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-29 05:09:21,741 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.03 ms. Allocated memory is still 83.9 MB. Free memory was 63.1 MB in the beginning and 63.1 MB in the end (delta: 21.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 321.48 ms. Allocated memory was 83.9 MB in the beginning and 123.7 MB in the end (delta: 39.8 MB). Free memory was 49.7 MB in the beginning and 99.8 MB in the end (delta: -50.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 49.53 ms. Allocated memory is still 123.7 MB. Free memory was 99.8 MB in the beginning and 98.3 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 53.39 ms. Allocated memory is still 123.7 MB. Free memory was 98.3 MB in the beginning and 97.2 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 731.40 ms. Allocated memory is still 123.7 MB. Free memory was 97.2 MB in the beginning and 76.0 MB in the end (delta: 21.2 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. * TraceAbstraction took 37827.99 ms. Allocated memory was 123.7 MB in the beginning and 239.1 MB in the end (delta: 115.3 MB). Free memory was 76.0 MB in the beginning and 180.3 MB in the end (delta: -104.3 MB). Peak memory consumption was 12.4 MB. Max. memory is 16.1 GB. * Witness Printer took 57.01 ms. Allocated memory is still 239.1 MB. Free memory was 180.3 MB in the beginning and 177.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 48]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 48]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 49]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 49]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 11]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 52]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 52]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 52]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 40]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 11]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 26]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 26]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 26]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 26]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 33]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 33]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 34]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 34]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 11]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 47 locations, 19 error locations. Started 1 CEGAR loops. OverallTime: 37.7s, OverallIterations: 18, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 7.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 374 SDtfs, 1655 SDslu, 1300 SDs, 0 SdLazy, 2596 SolverSat, 291 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 564 GetRequests, 242 SyntacticMatches, 11 SemanticMatches, 311 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 22.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=65occurred in iteration=14, InterpolantAutomatonStates: 177, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 18 MinimizatonAttempts, 96 StatesRemovedByMinimization, 11 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 25.7s InterpolantComputationTime, 414 NumberOfCodeBlocks, 414 NumberOfCodeBlocksAsserted, 29 NumberOfCheckSat, 544 ConstructedInterpolants, 56 QuantifiedInterpolants, 8111 SizeOfPredicates, 123 NumberOfNonLiveVariables, 1573 ConjunctsInSsa, 200 ConjunctsInUnsatCore, 36 InterpolantComputations, 9 PerfectInterpolantSequences, 53/153 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 19 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-10-29 05:09:21,799 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94a87821-f30f-43cc-8f15-5c048453b445/bin/utaipan-SDwSMHVbGG/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...