./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec8_product28.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec8_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 459b394196a1606fd18d87736056d8c2e811f354c9c1071577c3ccd936910200 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:56:14,965 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:56:14,969 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:56:15,026 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:56:15,027 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:56:15,031 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:56:15,033 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:56:15,037 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:56:15,040 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:56:15,046 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:56:15,047 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:56:15,049 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:56:15,050 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:56:15,053 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:56:15,055 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:56:15,060 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:56:15,062 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:56:15,063 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:56:15,066 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:56:15,074 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:56:15,076 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:56:15,077 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:56:15,081 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:56:15,082 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:56:15,092 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:56:15,092 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:56:15,093 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:56:15,095 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:56:15,096 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:56:15,097 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:56:15,098 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:56:15,099 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:56:15,101 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:56:15,103 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:56:15,104 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:56:15,105 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:56:15,106 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:56:15,106 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:56:15,106 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:56:15,107 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:56:15,108 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:56:15,113 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:56:15,156 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:56:15,156 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:56:15,158 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:56:15,158 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:56:15,158 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:56:15,159 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:56:15,159 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:56:15,159 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:56:15,165 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:56:15,166 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:56:15,167 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:56:15,167 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:56:15,167 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:56:15,168 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:56:15,168 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:56:15,169 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:56:15,169 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:56:15,169 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:56:15,169 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:56:15,170 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:56:15,170 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:56:15,170 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:56:15,170 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:56:15,170 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:56:15,171 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:56:15,171 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:56:15,171 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:56:15,172 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:56:15,172 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:56:15,172 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:56:15,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:56:15,173 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:56:15,173 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:56:15,173 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:56:15,174 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:56:15,174 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:56:15,174 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:56:15,174 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:56:15,174 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:56:15,175 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_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 459b394196a1606fd18d87736056d8c2e811f354c9c1071577c3ccd936910200 [2021-11-07 00:56:15,502 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:56:15,540 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:56:15,543 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:56:15,544 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:56:15,546 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:56:15,547 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec8_product28.cil.c [2021-11-07 00:56:15,637 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data/18157f7c5/c80d482f03b441bd8a54864a29f9837d/FLAG5407bcc8d [2021-11-07 00:56:16,414 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:56:16,421 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/sv-benchmarks/c/product-lines/email_spec8_product28.cil.c [2021-11-07 00:56:16,445 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data/18157f7c5/c80d482f03b441bd8a54864a29f9837d/FLAG5407bcc8d [2021-11-07 00:56:16,590 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data/18157f7c5/c80d482f03b441bd8a54864a29f9837d [2021-11-07 00:56:16,593 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:56:16,594 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:56:16,596 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:56:16,596 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:56:16,600 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:56:16,601 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:56:16" (1/1) ... [2021-11-07 00:56:16,602 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57f5c6d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:16, skipping insertion in model container [2021-11-07 00:56:16,602 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:56:16" (1/1) ... [2021-11-07 00:56:16,610 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:56:16,678 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:56:17,093 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_18913fd3-29c7-44c2-be39-328dd6481a6f/sv-benchmarks/c/product-lines/email_spec8_product28.cil.c[29342,29355] [2021-11-07 00:56:17,327 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:56:17,341 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 00:56:17,341 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@1e7de4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:17, skipping insertion in model container [2021-11-07 00:56:17,341 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:56:17,342 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 00:56:17,344 INFO L168 Benchmark]: Toolchain (without parser) took 748.58 ms. Allocated memory is still 132.1 MB. Free memory was 96.5 MB in the beginning and 94.1 MB in the end (delta: 2.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 00:56:17,345 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 90.2 MB. Free memory is still 45.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 00:56:17,346 INFO L168 Benchmark]: CACSL2BoogieTranslator took 745.66 ms. Allocated memory is still 132.1 MB. Free memory was 96.5 MB in the beginning and 94.1 MB in the end (delta: 2.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 00:56:17,347 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 90.2 MB. Free memory is still 45.0 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 745.66 ms. Allocated memory is still 132.1 MB. Free memory was 96.5 MB in the beginning and 94.1 MB in the end (delta: 2.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 959]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec8_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 459b394196a1606fd18d87736056d8c2e811f354c9c1071577c3ccd936910200 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:56:19,691 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:56:19,694 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:56:19,728 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:56:19,731 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:56:19,734 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:56:19,738 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:56:19,742 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:56:19,745 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:56:19,747 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:56:19,749 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:56:19,753 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:56:19,753 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:56:19,754 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:56:19,756 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:56:19,758 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:56:19,759 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:56:19,760 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:56:19,762 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:56:19,769 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:56:19,772 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:56:19,774 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:56:19,776 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:56:19,778 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:56:19,788 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:56:19,788 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:56:19,789 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:56:19,792 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:56:19,794 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:56:19,795 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:56:19,796 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:56:19,797 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:56:19,799 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:56:19,800 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:56:19,801 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:56:19,802 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:56:19,803 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:56:19,803 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:56:19,803 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:56:19,805 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:56:19,806 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:56:19,807 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 00:56:19,855 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:56:19,856 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:56:19,857 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:56:19,857 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:56:19,858 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:56:19,858 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:56:19,858 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:56:19,858 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:56:19,859 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:56:19,860 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:56:19,861 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:56:19,862 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:56:19,862 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:56:19,862 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:56:19,862 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:56:19,863 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:56:19,863 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:56:19,863 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 00:56:19,863 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 00:56:19,863 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:56:19,864 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:56:19,864 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:56:19,864 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:56:19,864 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:56:19,865 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 00:56:19,865 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:56:19,865 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:56:19,865 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:56:19,866 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:56:19,866 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:56:19,866 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 00:56:19,866 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:19,867 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:56:19,867 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:56:19,867 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:56:19,867 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 459b394196a1606fd18d87736056d8c2e811f354c9c1071577c3ccd936910200 [2021-11-07 00:56:20,339 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:56:20,371 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:56:20,373 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:56:20,374 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:56:20,375 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:56:20,376 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec8_product28.cil.c [2021-11-07 00:56:20,466 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data/0a11c645e/d59d2253b9a043068dda82e61af0416c/FLAG6290ecf17 [2021-11-07 00:56:21,223 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:56:21,223 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/sv-benchmarks/c/product-lines/email_spec8_product28.cil.c [2021-11-07 00:56:21,259 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data/0a11c645e/d59d2253b9a043068dda82e61af0416c/FLAG6290ecf17 [2021-11-07 00:56:21,420 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/data/0a11c645e/d59d2253b9a043068dda82e61af0416c [2021-11-07 00:56:21,425 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:56:21,428 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:56:21,432 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:56:21,433 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:56:21,437 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:56:21,438 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:56:21" (1/1) ... [2021-11-07 00:56:21,441 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@175fe284 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:21, skipping insertion in model container [2021-11-07 00:56:21,441 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:56:21" (1/1) ... [2021-11-07 00:56:21,452 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:56:21,591 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:56:22,186 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_18913fd3-29c7-44c2-be39-328dd6481a6f/sv-benchmarks/c/product-lines/email_spec8_product28.cil.c[29342,29355] [2021-11-07 00:56:22,346 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:56:22,364 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 00:56:22,394 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:56:22,499 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_18913fd3-29c7-44c2-be39-328dd6481a6f/sv-benchmarks/c/product-lines/email_spec8_product28.cil.c[29342,29355] [2021-11-07 00:56:22,597 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:56:22,610 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:56:22,679 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_18913fd3-29c7-44c2-be39-328dd6481a6f/sv-benchmarks/c/product-lines/email_spec8_product28.cil.c[29342,29355] [2021-11-07 00:56:22,717 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:56:22,786 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:56:22,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22 WrapperNode [2021-11-07 00:56:22,787 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:56:22,788 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:56:22,789 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:56:22,789 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:56:22,797 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:22,833 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:22,918 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:56:22,918 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:56:22,919 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:56:22,919 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:56:22,930 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:22,930 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:22,947 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:22,955 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:22,992 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:23,025 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:23,048 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:23,075 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:56:23,076 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:56:23,077 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:56:23,078 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:56:23,078 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (1/1) ... [2021-11-07 00:56:23,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:56:23,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:56:23,114 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:56:23,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:56:23,185 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 00:56:23,186 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:56:23,188 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 00:56:23,188 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:56:23,189 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:56:27,913 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:56:27,914 INFO L299 CfgBuilder]: Removed 295 assume(true) statements. [2021-11-07 00:56:27,923 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:56:27 BoogieIcfgContainer [2021-11-07 00:56:27,925 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:56:27,928 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:56:27,928 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:56:27,931 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:56:27,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:56:21" (1/3) ... [2021-11-07 00:56:27,932 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@231cca6b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:56:27, skipping insertion in model container [2021-11-07 00:56:27,932 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:22" (2/3) ... [2021-11-07 00:56:27,933 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@231cca6b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:56:27, skipping insertion in model container [2021-11-07 00:56:27,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:56:27" (3/3) ... [2021-11-07 00:56:27,934 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec8_product28.cil.c [2021-11-07 00:56:27,940 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:56:27,940 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 00:56:28,008 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:56:28,017 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 00:56:28,017 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 00:56:28,055 INFO L276 IsEmpty]: Start isEmpty. Operand has 477 states, 474 states have (on average 1.761603375527426) internal successors, (835), 476 states have internal predecessors, (835), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:28,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 00:56:28,079 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:28,080 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:28,081 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:28,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:28,087 INFO L85 PathProgramCache]: Analyzing trace with hash 688116892, now seen corresponding path program 1 times [2021-11-07 00:56:28,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:28,105 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1468143028] [2021-11-07 00:56:28,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:28,106 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:28,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:28,111 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:28,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 00:56:28,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:28,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 00:56:28,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:28,737 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:28,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:28,876 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:28,877 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:28,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1468143028] [2021-11-07 00:56:28,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1468143028] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:28,878 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:28,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 00:56:28,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286802027] [2021-11-07 00:56:28,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 00:56:28,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:28,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 00:56:28,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:56:28,912 INFO L87 Difference]: Start difference. First operand has 477 states, 474 states have (on average 1.761603375527426) internal successors, (835), 476 states have internal predecessors, (835), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:28,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:28,989 INFO L93 Difference]: Finished difference Result 716 states and 1236 transitions. [2021-11-07 00:56:28,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 00:56:28,993 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 00:56:28,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:29,014 INFO L225 Difference]: With dead ends: 716 [2021-11-07 00:56:29,015 INFO L226 Difference]: Without dead ends: 407 [2021-11-07 00:56:29,019 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:56:29,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2021-11-07 00:56:29,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 407. [2021-11-07 00:56:29,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 405 states have (on average 1.7580246913580246) internal successors, (712), 406 states have internal predecessors, (712), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:29,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 712 transitions. [2021-11-07 00:56:29,108 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 712 transitions. Word has length 45 [2021-11-07 00:56:29,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:29,109 INFO L470 AbstractCegarLoop]: Abstraction has 407 states and 712 transitions. [2021-11-07 00:56:29,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:29,109 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 712 transitions. [2021-11-07 00:56:29,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 00:56:29,113 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:29,113 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:29,126 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-07 00:56:29,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:29,321 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:29,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:29,322 INFO L85 PathProgramCache]: Analyzing trace with hash 549277264, now seen corresponding path program 1 times [2021-11-07 00:56:29,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:29,324 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1739294584] [2021-11-07 00:56:29,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:29,324 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:29,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:29,326 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:29,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 00:56:29,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:29,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:56:29,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:29,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:29,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:30,058 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:30,059 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:30,059 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1739294584] [2021-11-07 00:56:30,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1739294584] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:30,060 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:30,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:56:30,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595006824] [2021-11-07 00:56:30,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:56:30,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:30,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:56:30,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:30,067 INFO L87 Difference]: Start difference. First operand 407 states and 712 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:30,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:30,200 INFO L93 Difference]: Finished difference Result 1191 states and 2088 transitions. [2021-11-07 00:56:30,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:56:30,201 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 00:56:30,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:30,213 INFO L225 Difference]: With dead ends: 1191 [2021-11-07 00:56:30,213 INFO L226 Difference]: Without dead ends: 799 [2021-11-07 00:56:30,220 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:30,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-11-07 00:56:30,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 406. [2021-11-07 00:56:30,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 404 states have (on average 1.75) internal successors, (707), 405 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:30,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 707 transitions. [2021-11-07 00:56:30,290 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 707 transitions. Word has length 46 [2021-11-07 00:56:30,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:30,292 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 707 transitions. [2021-11-07 00:56:30,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:30,292 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 707 transitions. [2021-11-07 00:56:30,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 00:56:30,304 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:30,305 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:30,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:30,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:30,525 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:30,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:30,525 INFO L85 PathProgramCache]: Analyzing trace with hash 256234666, now seen corresponding path program 1 times [2021-11-07 00:56:30,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:30,527 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [871067258] [2021-11-07 00:56:30,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:30,527 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:30,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:30,529 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:30,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 00:56:30,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:30,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:56:30,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:31,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:31,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:31,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:31,256 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:31,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [871067258] [2021-11-07 00:56:31,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [871067258] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:31,257 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:31,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:56:31,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493737296] [2021-11-07 00:56:31,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:56:31,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:31,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:56:31,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:56:31,259 INFO L87 Difference]: Start difference. First operand 406 states and 707 transitions. Second operand has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:31,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:31,553 INFO L93 Difference]: Finished difference Result 1541 states and 2690 transitions. [2021-11-07 00:56:31,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:56:31,554 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 00:56:31,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:31,563 INFO L225 Difference]: With dead ends: 1541 [2021-11-07 00:56:31,563 INFO L226 Difference]: Without dead ends: 1153 [2021-11-07 00:56:31,564 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:56:31,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1153 states. [2021-11-07 00:56:31,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1153 to 405. [2021-11-07 00:56:31,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 403 states have (on average 1.7444168734491314) internal successors, (703), 404 states have internal predecessors, (703), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:31,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 703 transitions. [2021-11-07 00:56:31,598 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 703 transitions. Word has length 48 [2021-11-07 00:56:31,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:31,598 INFO L470 AbstractCegarLoop]: Abstraction has 405 states and 703 transitions. [2021-11-07 00:56:31,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:31,598 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 703 transitions. [2021-11-07 00:56:31,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 00:56:31,600 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:31,600 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:31,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:31,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:31,820 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:31,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:31,823 INFO L85 PathProgramCache]: Analyzing trace with hash 2045903351, now seen corresponding path program 1 times [2021-11-07 00:56:31,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:31,825 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [210754906] [2021-11-07 00:56:31,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:31,826 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:31,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:31,828 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:31,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 00:56:32,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:32,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:56:32,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:32,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:32,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:32,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:32,584 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:32,584 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [210754906] [2021-11-07 00:56:32,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [210754906] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:32,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:32,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:56:32,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738659002] [2021-11-07 00:56:32,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:56:32,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:32,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:56:32,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:32,587 INFO L87 Difference]: Start difference. First operand 405 states and 703 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:32,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:32,662 INFO L93 Difference]: Finished difference Result 807 states and 1403 transitions. [2021-11-07 00:56:32,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:56:32,663 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 00:56:32,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:32,667 INFO L225 Difference]: With dead ends: 807 [2021-11-07 00:56:32,667 INFO L226 Difference]: Without dead ends: 410 [2021-11-07 00:56:32,668 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:32,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2021-11-07 00:56:32,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 405. [2021-11-07 00:56:32,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 403 states have (on average 1.7369727047146402) internal successors, (700), 404 states have internal predecessors, (700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:32,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 700 transitions. [2021-11-07 00:56:32,697 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 700 transitions. Word has length 49 [2021-11-07 00:56:32,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:32,698 INFO L470 AbstractCegarLoop]: Abstraction has 405 states and 700 transitions. [2021-11-07 00:56:32,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:32,698 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 700 transitions. [2021-11-07 00:56:32,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 00:56:32,700 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:32,700 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:32,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:32,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:32,916 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:32,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:32,916 INFO L85 PathProgramCache]: Analyzing trace with hash -448494910, now seen corresponding path program 1 times [2021-11-07 00:56:32,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:32,917 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [325545272] [2021-11-07 00:56:32,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:32,918 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:32,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:32,919 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:32,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 00:56:33,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:33,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:56:33,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:33,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:33,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:33,650 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:33,651 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:33,651 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [325545272] [2021-11-07 00:56:33,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [325545272] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:33,651 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:33,652 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:56:33,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966860133] [2021-11-07 00:56:33,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:56:33,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:33,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:56:33,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:56:33,654 INFO L87 Difference]: Start difference. First operand 405 states and 700 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:33,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:33,920 INFO L93 Difference]: Finished difference Result 1528 states and 2666 transitions. [2021-11-07 00:56:33,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:56:33,921 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-07 00:56:33,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:33,929 INFO L225 Difference]: With dead ends: 1528 [2021-11-07 00:56:33,930 INFO L226 Difference]: Without dead ends: 1149 [2021-11-07 00:56:33,931 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:56:33,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-07 00:56:33,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 405. [2021-11-07 00:56:33,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 403 states have (on average 1.7295285359801489) internal successors, (697), 404 states have internal predecessors, (697), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:33,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 697 transitions. [2021-11-07 00:56:33,984 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 697 transitions. Word has length 50 [2021-11-07 00:56:33,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:33,985 INFO L470 AbstractCegarLoop]: Abstraction has 405 states and 697 transitions. [2021-11-07 00:56:33,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:33,985 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 697 transitions. [2021-11-07 00:56:33,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 00:56:33,986 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:33,987 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:34,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:34,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:34,205 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:34,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:34,206 INFO L85 PathProgramCache]: Analyzing trace with hash 1996786599, now seen corresponding path program 1 times [2021-11-07 00:56:34,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:34,207 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [792227708] [2021-11-07 00:56:34,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:34,208 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:34,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:34,209 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:34,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 00:56:34,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:34,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:34,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:34,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:34,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:34,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:34,966 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:34,966 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [792227708] [2021-11-07 00:56:34,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [792227708] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:34,967 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:34,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:56:34,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17917414] [2021-11-07 00:56:34,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:56:34,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:34,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:56:34,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:34,969 INFO L87 Difference]: Start difference. First operand 405 states and 697 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:35,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:35,065 INFO L93 Difference]: Finished difference Result 953 states and 1645 transitions. [2021-11-07 00:56:35,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:56:35,066 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 00:56:35,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:35,072 INFO L225 Difference]: With dead ends: 953 [2021-11-07 00:56:35,072 INFO L226 Difference]: Without dead ends: 784 [2021-11-07 00:56:35,073 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:35,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 784 states. [2021-11-07 00:56:35,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 784 to 615. [2021-11-07 00:56:35,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 615 states, 613 states have (on average 1.7634584013050572) internal successors, (1081), 614 states have internal predecessors, (1081), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:35,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 615 states to 615 states and 1081 transitions. [2021-11-07 00:56:35,140 INFO L78 Accepts]: Start accepts. Automaton has 615 states and 1081 transitions. Word has length 52 [2021-11-07 00:56:35,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:35,141 INFO L470 AbstractCegarLoop]: Abstraction has 615 states and 1081 transitions. [2021-11-07 00:56:35,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:35,141 INFO L276 IsEmpty]: Start isEmpty. Operand 615 states and 1081 transitions. [2021-11-07 00:56:35,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 00:56:35,144 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:35,144 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:35,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:35,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:35,360 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:35,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:35,361 INFO L85 PathProgramCache]: Analyzing trace with hash 164223446, now seen corresponding path program 1 times [2021-11-07 00:56:35,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:35,362 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [134897997] [2021-11-07 00:56:35,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:35,362 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:35,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:35,363 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:35,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 00:56:35,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:35,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:35,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:35,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:35,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:36,133 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:36,133 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:36,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [134897997] [2021-11-07 00:56:36,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [134897997] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:36,134 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:36,134 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:56:36,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195219256] [2021-11-07 00:56:36,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:56:36,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:36,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:56:36,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:36,135 INFO L87 Difference]: Start difference. First operand 615 states and 1081 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:36,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:36,230 INFO L93 Difference]: Finished difference Result 1473 states and 2598 transitions. [2021-11-07 00:56:36,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:56:36,231 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 00:56:36,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:36,237 INFO L225 Difference]: With dead ends: 1473 [2021-11-07 00:56:36,237 INFO L226 Difference]: Without dead ends: 942 [2021-11-07 00:56:36,238 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:36,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 942 states. [2021-11-07 00:56:36,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 942 to 773. [2021-11-07 00:56:36,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 773 states, 771 states have (on average 1.7743190661478598) internal successors, (1368), 772 states have internal predecessors, (1368), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:36,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 773 states to 773 states and 1368 transitions. [2021-11-07 00:56:36,307 INFO L78 Accepts]: Start accepts. Automaton has 773 states and 1368 transitions. Word has length 64 [2021-11-07 00:56:36,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:36,307 INFO L470 AbstractCegarLoop]: Abstraction has 773 states and 1368 transitions. [2021-11-07 00:56:36,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:36,308 INFO L276 IsEmpty]: Start isEmpty. Operand 773 states and 1368 transitions. [2021-11-07 00:56:36,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 00:56:36,310 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:36,310 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:36,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:36,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:36,525 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:36,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:36,525 INFO L85 PathProgramCache]: Analyzing trace with hash 566835671, now seen corresponding path program 1 times [2021-11-07 00:56:36,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:36,526 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [345823443] [2021-11-07 00:56:36,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:36,526 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:36,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:36,527 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:36,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 00:56:36,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:36,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:36,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:37,174 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:37,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:37,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:37,347 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:37,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [345823443] [2021-11-07 00:56:37,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [345823443] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:37,348 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:37,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:56:37,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625462308] [2021-11-07 00:56:37,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:56:37,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:37,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:56:37,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:37,350 INFO L87 Difference]: Start difference. First operand 773 states and 1368 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:37,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:37,452 INFO L93 Difference]: Finished difference Result 1991 states and 3545 transitions. [2021-11-07 00:56:37,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:56:37,457 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-07 00:56:37,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:37,466 INFO L225 Difference]: With dead ends: 1991 [2021-11-07 00:56:37,466 INFO L226 Difference]: Without dead ends: 1306 [2021-11-07 00:56:37,470 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:37,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1306 states. [2021-11-07 00:56:37,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1306 to 1137. [2021-11-07 00:56:37,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1137 states, 1135 states have (on average 1.790308370044053) internal successors, (2032), 1136 states have internal predecessors, (2032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:37,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1137 states to 1137 states and 2032 transitions. [2021-11-07 00:56:37,574 INFO L78 Accepts]: Start accepts. Automaton has 1137 states and 2032 transitions. Word has length 65 [2021-11-07 00:56:37,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:37,575 INFO L470 AbstractCegarLoop]: Abstraction has 1137 states and 2032 transitions. [2021-11-07 00:56:37,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:37,575 INFO L276 IsEmpty]: Start isEmpty. Operand 1137 states and 2032 transitions. [2021-11-07 00:56:37,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:56:37,578 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:37,578 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:37,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:37,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:37,796 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:37,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:37,797 INFO L85 PathProgramCache]: Analyzing trace with hash 283001415, now seen corresponding path program 1 times [2021-11-07 00:56:37,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:37,797 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1075975252] [2021-11-07 00:56:37,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:37,798 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:37,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:37,798 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:37,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 00:56:38,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:38,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:38,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:38,433 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:38,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:38,578 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:38,578 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:38,578 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1075975252] [2021-11-07 00:56:38,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1075975252] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:38,579 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:38,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:56:38,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378640145] [2021-11-07 00:56:38,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:56:38,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:38,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:56:38,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:38,580 INFO L87 Difference]: Start difference. First operand 1137 states and 2032 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:38,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:38,711 INFO L93 Difference]: Finished difference Result 2201 states and 3926 transitions. [2021-11-07 00:56:38,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:56:38,712 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:56:38,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:38,720 INFO L225 Difference]: With dead ends: 2201 [2021-11-07 00:56:38,720 INFO L226 Difference]: Without dead ends: 1306 [2021-11-07 00:56:38,721 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:38,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1306 states. [2021-11-07 00:56:38,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1306 to 1137. [2021-11-07 00:56:38,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1137 states, 1135 states have (on average 1.7885462555066078) internal successors, (2030), 1136 states have internal predecessors, (2030), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:38,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1137 states to 1137 states and 2030 transitions. [2021-11-07 00:56:38,808 INFO L78 Accepts]: Start accepts. Automaton has 1137 states and 2030 transitions. Word has length 66 [2021-11-07 00:56:38,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:38,808 INFO L470 AbstractCegarLoop]: Abstraction has 1137 states and 2030 transitions. [2021-11-07 00:56:38,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:38,808 INFO L276 IsEmpty]: Start isEmpty. Operand 1137 states and 2030 transitions. [2021-11-07 00:56:38,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:56:38,811 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:38,811 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:38,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:39,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:39,027 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:39,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:39,027 INFO L85 PathProgramCache]: Analyzing trace with hash 2123805544, now seen corresponding path program 1 times [2021-11-07 00:56:39,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:39,028 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2012333646] [2021-11-07 00:56:39,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:39,028 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:39,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:39,029 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:39,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 00:56:39,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:39,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:39,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:39,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:39,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:39,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:39,813 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:39,813 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2012333646] [2021-11-07 00:56:39,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2012333646] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:39,813 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:39,813 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:56:39,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511244685] [2021-11-07 00:56:39,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:56:39,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:39,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:56:39,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:39,815 INFO L87 Difference]: Start difference. First operand 1137 states and 2030 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:39,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:39,968 INFO L93 Difference]: Finished difference Result 3055 states and 5486 transitions. [2021-11-07 00:56:39,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:56:39,969 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:56:39,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:39,995 INFO L225 Difference]: With dead ends: 3055 [2021-11-07 00:56:39,996 INFO L226 Difference]: Without dead ends: 2014 [2021-11-07 00:56:39,997 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:40,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2014 states. [2021-11-07 00:56:40,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2014 to 1845. [2021-11-07 00:56:40,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1845 states, 1843 states have (on average 1.801953336950624) internal successors, (3321), 1844 states have internal predecessors, (3321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:40,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1845 states to 1845 states and 3321 transitions. [2021-11-07 00:56:40,137 INFO L78 Accepts]: Start accepts. Automaton has 1845 states and 3321 transitions. Word has length 66 [2021-11-07 00:56:40,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:40,137 INFO L470 AbstractCegarLoop]: Abstraction has 1845 states and 3321 transitions. [2021-11-07 00:56:40,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:40,138 INFO L276 IsEmpty]: Start isEmpty. Operand 1845 states and 3321 transitions. [2021-11-07 00:56:40,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 00:56:40,145 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:40,145 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:40,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:40,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:40,361 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:40,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:40,361 INFO L85 PathProgramCache]: Analyzing trace with hash 1374114645, now seen corresponding path program 1 times [2021-11-07 00:56:40,362 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:40,362 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [148957656] [2021-11-07 00:56:40,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:40,362 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:40,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:40,365 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:40,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 00:56:40,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:40,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:40,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:41,119 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:41,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:41,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:41,266 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:41,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [148957656] [2021-11-07 00:56:41,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [148957656] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:41,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:41,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:56:41,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358413922] [2021-11-07 00:56:41,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:56:41,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:41,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:56:41,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:41,268 INFO L87 Difference]: Start difference. First operand 1845 states and 3321 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:41,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:41,516 INFO L93 Difference]: Finished difference Result 4915 states and 8878 transitions. [2021-11-07 00:56:41,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:56:41,517 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-07 00:56:41,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:41,539 INFO L225 Difference]: With dead ends: 4915 [2021-11-07 00:56:41,540 INFO L226 Difference]: Without dead ends: 3200 [2021-11-07 00:56:41,544 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:41,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3200 states. [2021-11-07 00:56:41,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3200 to 3031. [2021-11-07 00:56:41,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3031 states, 3029 states have (on average 1.8085176625949158) internal successors, (5478), 3030 states have internal predecessors, (5478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:41,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3031 states to 3031 states and 5478 transitions. [2021-11-07 00:56:41,794 INFO L78 Accepts]: Start accepts. Automaton has 3031 states and 5478 transitions. Word has length 67 [2021-11-07 00:56:41,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:41,794 INFO L470 AbstractCegarLoop]: Abstraction has 3031 states and 5478 transitions. [2021-11-07 00:56:41,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:41,794 INFO L276 IsEmpty]: Start isEmpty. Operand 3031 states and 5478 transitions. [2021-11-07 00:56:41,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 00:56:41,803 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:41,803 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:41,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:42,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:42,005 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:42,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:42,005 INFO L85 PathProgramCache]: Analyzing trace with hash 1138988279, now seen corresponding path program 1 times [2021-11-07 00:56:42,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:42,006 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1217859041] [2021-11-07 00:56:42,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:42,006 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:42,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:42,009 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:42,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 00:56:42,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:42,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:42,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:42,741 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:42,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:42,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:42,926 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:42,927 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1217859041] [2021-11-07 00:56:42,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1217859041] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:42,927 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:42,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:56:42,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867334536] [2021-11-07 00:56:42,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:56:42,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:42,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:56:42,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:42,928 INFO L87 Difference]: Start difference. First operand 3031 states and 5478 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:43,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:43,247 INFO L93 Difference]: Finished difference Result 8189 states and 14832 transitions. [2021-11-07 00:56:43,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:56:43,248 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 00:56:43,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:43,285 INFO L225 Difference]: With dead ends: 8189 [2021-11-07 00:56:43,285 INFO L226 Difference]: Without dead ends: 5322 [2021-11-07 00:56:43,290 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:43,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5322 states. [2021-11-07 00:56:43,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5322 to 5153. [2021-11-07 00:56:43,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5153 states, 5151 states have (on average 1.8107163657542225) internal successors, (9327), 5152 states have internal predecessors, (9327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:43,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5153 states to 5153 states and 9327 transitions. [2021-11-07 00:56:43,723 INFO L78 Accepts]: Start accepts. Automaton has 5153 states and 9327 transitions. Word has length 68 [2021-11-07 00:56:43,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:43,724 INFO L470 AbstractCegarLoop]: Abstraction has 5153 states and 9327 transitions. [2021-11-07 00:56:43,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:43,724 INFO L276 IsEmpty]: Start isEmpty. Operand 5153 states and 9327 transitions. [2021-11-07 00:56:43,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:56:43,730 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:43,731 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:43,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:43,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:43,947 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:43,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:43,947 INFO L85 PathProgramCache]: Analyzing trace with hash 1892339571, now seen corresponding path program 1 times [2021-11-07 00:56:43,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:43,948 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1552335637] [2021-11-07 00:56:43,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:43,948 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:43,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:43,951 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:43,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 00:56:44,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:44,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:56:44,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:44,696 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:56:44,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:44,895 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:56:44,895 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:44,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1552335637] [2021-11-07 00:56:44,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1552335637] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:44,895 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:44,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:56:44,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874297168] [2021-11-07 00:56:44,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:56:44,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:44,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:56:44,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:56:44,897 INFO L87 Difference]: Start difference. First operand 5153 states and 9327 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:48,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:48,180 INFO L93 Difference]: Finished difference Result 19264 states and 34910 transitions. [2021-11-07 00:56:48,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 00:56:48,180 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 00:56:48,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:48,264 INFO L225 Difference]: With dead ends: 19264 [2021-11-07 00:56:48,264 INFO L226 Difference]: Without dead ends: 14351 [2021-11-07 00:56:48,274 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:56:48,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14351 states. [2021-11-07 00:56:48,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14351 to 5103. [2021-11-07 00:56:48,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5103 states, 5101 states have (on average 1.7892570084297197) internal successors, (9127), 5102 states have internal predecessors, (9127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:48,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5103 states to 5103 states and 9127 transitions. [2021-11-07 00:56:48,810 INFO L78 Accepts]: Start accepts. Automaton has 5103 states and 9127 transitions. Word has length 69 [2021-11-07 00:56:48,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:48,810 INFO L470 AbstractCegarLoop]: Abstraction has 5103 states and 9127 transitions. [2021-11-07 00:56:48,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:48,812 INFO L276 IsEmpty]: Start isEmpty. Operand 5103 states and 9127 transitions. [2021-11-07 00:56:48,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:56:48,817 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:48,818 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:48,838 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-11-07 00:56:49,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:49,034 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:49,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:49,035 INFO L85 PathProgramCache]: Analyzing trace with hash 995183300, now seen corresponding path program 1 times [2021-11-07 00:56:49,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:49,036 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1619758873] [2021-11-07 00:56:49,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:49,037 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:49,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:49,038 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:49,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 00:56:49,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:49,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:49,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:50,107 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:50,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:50,303 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:50,303 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:50,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1619758873] [2021-11-07 00:56:50,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1619758873] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:50,304 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:50,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:56:50,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648765468] [2021-11-07 00:56:50,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:56:50,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:50,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:56:50,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:50,306 INFO L87 Difference]: Start difference. First operand 5103 states and 9127 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:50,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:50,927 INFO L93 Difference]: Finished difference Result 14866 states and 26633 transitions. [2021-11-07 00:56:50,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:56:50,927 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 00:56:50,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:50,957 INFO L225 Difference]: With dead ends: 14866 [2021-11-07 00:56:50,957 INFO L226 Difference]: Without dead ends: 9930 [2021-11-07 00:56:50,967 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:56:50,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9930 states. [2021-11-07 00:56:51,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9930 to 9761. [2021-11-07 00:56:51,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9761 states, 9759 states have (on average 1.7895276155343784) internal successors, (17464), 9760 states have internal predecessors, (17464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:51,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9761 states to 9761 states and 17464 transitions. [2021-11-07 00:56:51,711 INFO L78 Accepts]: Start accepts. Automaton has 9761 states and 17464 transitions. Word has length 69 [2021-11-07 00:56:51,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:51,712 INFO L470 AbstractCegarLoop]: Abstraction has 9761 states and 17464 transitions. [2021-11-07 00:56:51,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:51,712 INFO L276 IsEmpty]: Start isEmpty. Operand 9761 states and 17464 transitions. [2021-11-07 00:56:51,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 00:56:51,720 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:51,720 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:51,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:51,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:51,934 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:51,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:51,934 INFO L85 PathProgramCache]: Analyzing trace with hash -1364184488, now seen corresponding path program 1 times [2021-11-07 00:56:51,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:51,935 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [78743500] [2021-11-07 00:56:51,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:51,935 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:51,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:51,937 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:51,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 00:56:52,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:52,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:56:52,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:52,833 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:52,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:53,052 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:53,053 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:53,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [78743500] [2021-11-07 00:56:53,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [78743500] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:56:53,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [435798577] [2021-11-07 00:56:53,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:53,053 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:53,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:56:53,056 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:56:53,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 00:56:53,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:53,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:53,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:54,134 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:54,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:54,399 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:54,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [435798577] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:54,399 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:56:54,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 00:56:54,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974446750] [2021-11-07 00:56:54,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:56:54,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:54,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:56:54,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:56:54,401 INFO L87 Difference]: Start difference. First operand 9761 states and 17464 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:55,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:55,086 INFO L93 Difference]: Finished difference Result 9877 states and 17656 transitions. [2021-11-07 00:56:55,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:56:55,086 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-07 00:56:55,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:55,122 INFO L225 Difference]: With dead ends: 9877 [2021-11-07 00:56:55,123 INFO L226 Difference]: Without dead ends: 9755 [2021-11-07 00:56:55,128 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 269 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:56:55,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9755 states. [2021-11-07 00:56:55,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9755 to 9755. [2021-11-07 00:56:55,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9755 states, 9754 states have (on average 1.7895222472831658) internal successors, (17455), 9754 states have internal predecessors, (17455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:55,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9755 states to 9755 states and 17455 transitions. [2021-11-07 00:56:55,961 INFO L78 Accepts]: Start accepts. Automaton has 9755 states and 17455 transitions. Word has length 70 [2021-11-07 00:56:55,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:55,961 INFO L470 AbstractCegarLoop]: Abstraction has 9755 states and 17455 transitions. [2021-11-07 00:56:55,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:55,962 INFO L276 IsEmpty]: Start isEmpty. Operand 9755 states and 17455 transitions. [2021-11-07 00:56:55,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 00:56:55,987 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:55,988 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:55,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:56,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:56,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:56,393 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:56,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:56,394 INFO L85 PathProgramCache]: Analyzing trace with hash 365857439, now seen corresponding path program 1 times [2021-11-07 00:56:56,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:56,394 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1416519697] [2021-11-07 00:56:56,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:56,395 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:56,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:56,395 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:56,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 00:56:57,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:57,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:56:57,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:57,451 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:57,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:57,810 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:57,810 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:57,810 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1416519697] [2021-11-07 00:56:57,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1416519697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:56:57,811 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [835422274] [2021-11-07 00:56:57,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:57,811 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:57,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:56:57,817 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:56:57,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 00:56:58,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:58,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:56:58,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:59,124 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:59,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:59,484 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:59,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [835422274] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:59,484 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:56:59,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 00:56:59,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733477324] [2021-11-07 00:56:59,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 00:56:59,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:59,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 00:56:59,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:56:59,487 INFO L87 Difference]: Start difference. First operand 9755 states and 17455 transitions. Second operand has 10 states, 10 states have (on average 14.2) internal successors, (142), 10 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:05,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:05,632 INFO L93 Difference]: Finished difference Result 57922 states and 104206 transitions. [2021-11-07 00:57:05,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 00:57:05,633 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 14.2) internal successors, (142), 10 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 107 [2021-11-07 00:57:05,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:05,789 INFO L225 Difference]: With dead ends: 57922 [2021-11-07 00:57:05,790 INFO L226 Difference]: Without dead ends: 57777 [2021-11-07 00:57:05,806 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 410 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 00:57:05,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57777 states. [2021-11-07 00:57:07,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57777 to 19458. [2021-11-07 00:57:07,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19458 states, 19457 states have (on average 1.7897928765996813) internal successors, (34824), 19457 states have internal predecessors, (34824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:07,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19458 states to 19458 states and 34824 transitions. [2021-11-07 00:57:07,879 INFO L78 Accepts]: Start accepts. Automaton has 19458 states and 34824 transitions. Word has length 107 [2021-11-07 00:57:07,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:07,880 INFO L470 AbstractCegarLoop]: Abstraction has 19458 states and 34824 transitions. [2021-11-07 00:57:07,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 14.2) internal successors, (142), 10 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:07,880 INFO L276 IsEmpty]: Start isEmpty. Operand 19458 states and 34824 transitions. [2021-11-07 00:57:07,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-07 00:57:07,932 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:07,933 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:07,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:08,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:08,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:08,341 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:08,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:08,342 INFO L85 PathProgramCache]: Analyzing trace with hash 630742098, now seen corresponding path program 1 times [2021-11-07 00:57:08,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:08,342 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1421368674] [2021-11-07 00:57:08,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:08,342 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:08,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:08,343 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:08,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 00:57:09,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:09,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:57:09,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:09,794 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:09,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:10,114 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:10,114 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:10,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1421368674] [2021-11-07 00:57:10,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1421368674] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:10,114 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:10,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 00:57:10,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60644732] [2021-11-07 00:57:10,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:57:10,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:10,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:57:10,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:57:10,117 INFO L87 Difference]: Start difference. First operand 19458 states and 34824 transitions. Second operand has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:11,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:11,434 INFO L93 Difference]: Finished difference Result 38006 states and 68246 transitions. [2021-11-07 00:57:11,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:57:11,436 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2021-11-07 00:57:11,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:11,501 INFO L225 Difference]: With dead ends: 38006 [2021-11-07 00:57:11,501 INFO L226 Difference]: Without dead ends: 18791 [2021-11-07 00:57:11,527 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:57:11,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18791 states. [2021-11-07 00:57:12,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18791 to 9757. [2021-11-07 00:57:12,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9757 states, 9756 states have (on average 1.7890528905289054) internal successors, (17454), 9756 states have internal predecessors, (17454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:12,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9757 states to 9757 states and 17454 transitions. [2021-11-07 00:57:12,699 INFO L78 Accepts]: Start accepts. Automaton has 9757 states and 17454 transitions. Word has length 108 [2021-11-07 00:57:12,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:12,700 INFO L470 AbstractCegarLoop]: Abstraction has 9757 states and 17454 transitions. [2021-11-07 00:57:12,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:12,700 INFO L276 IsEmpty]: Start isEmpty. Operand 9757 states and 17454 transitions. [2021-11-07 00:57:12,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-07 00:57:12,740 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:12,741 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:12,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:12,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:12,960 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:12,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:12,961 INFO L85 PathProgramCache]: Analyzing trace with hash 766779628, now seen corresponding path program 1 times [2021-11-07 00:57:12,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:12,961 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [293943534] [2021-11-07 00:57:12,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:12,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:12,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:12,964 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:13,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 00:57:13,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:13,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:13,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:14,185 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:14,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:14,484 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:14,484 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:14,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [293943534] [2021-11-07 00:57:14,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [293943534] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:14,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1527715686] [2021-11-07 00:57:14,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:14,484 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:14,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:14,485 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:14,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 00:57:15,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:15,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:57:15,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:15,887 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:15,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:16,169 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:16,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1527715686] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:16,169 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:16,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 00:57:16,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095264827] [2021-11-07 00:57:16,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:57:16,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:16,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:57:16,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:57:16,172 INFO L87 Difference]: Start difference. First operand 9757 states and 17454 transitions. Second operand has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:18,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:18,890 INFO L93 Difference]: Finished difference Result 10009 states and 17872 transitions. [2021-11-07 00:57:18,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:57:18,890 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2021-11-07 00:57:18,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:18,902 INFO L225 Difference]: With dead ends: 10009 [2021-11-07 00:57:18,902 INFO L226 Difference]: Without dead ends: 9853 [2021-11-07 00:57:18,904 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 423 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 00:57:18,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9853 states. [2021-11-07 00:57:19,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9853 to 9753. [2021-11-07 00:57:19,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9753 states, 9752 states have (on average 1.788966365873667) internal successors, (17446), 9752 states have internal predecessors, (17446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:19,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9753 states to 9753 states and 17446 transitions. [2021-11-07 00:57:19,638 INFO L78 Accepts]: Start accepts. Automaton has 9753 states and 17446 transitions. Word has length 109 [2021-11-07 00:57:19,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:19,638 INFO L470 AbstractCegarLoop]: Abstraction has 9753 states and 17446 transitions. [2021-11-07 00:57:19,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:19,638 INFO L276 IsEmpty]: Start isEmpty. Operand 9753 states and 17446 transitions. [2021-11-07 00:57:19,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-07 00:57:19,663 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:19,663 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:19,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:19,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:20,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:20,077 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:20,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:20,078 INFO L85 PathProgramCache]: Analyzing trace with hash 1012696798, now seen corresponding path program 1 times [2021-11-07 00:57:20,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:20,079 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [832748651] [2021-11-07 00:57:20,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:20,079 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:20,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:20,080 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:20,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 00:57:21,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:21,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:21,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:21,401 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:21,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:21,705 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:21,705 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:21,705 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [832748651] [2021-11-07 00:57:21,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [832748651] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:21,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1240262818] [2021-11-07 00:57:21,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:21,706 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:21,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:21,708 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:21,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 00:57:23,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:23,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:57:23,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:23,849 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:23,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:24,372 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:24,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1240262818] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:24,373 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:24,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:57:24,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873528216] [2021-11-07 00:57:24,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:57:24,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:24,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:57:24,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:57:24,375 INFO L87 Difference]: Start difference. First operand 9753 states and 17446 transitions. Second operand has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:40,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:40,707 INFO L93 Difference]: Finished difference Result 20324 states and 36208 transitions. [2021-11-07 00:57:40,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 00:57:40,707 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-07 00:57:40,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:40,737 INFO L225 Difference]: With dead ends: 20324 [2021-11-07 00:57:40,737 INFO L226 Difference]: Without dead ends: 20190 [2021-11-07 00:57:40,742 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 420 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=212, Invalid=718, Unknown=0, NotChecked=0, Total=930 [2021-11-07 00:57:40,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20190 states. [2021-11-07 00:57:42,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20190 to 19316. [2021-11-07 00:57:42,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19316 states, 19315 states have (on average 1.7903701786176547) internal successors, (34581), 19315 states have internal predecessors, (34581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:42,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19316 states to 19316 states and 34581 transitions. [2021-11-07 00:57:42,174 INFO L78 Accepts]: Start accepts. Automaton has 19316 states and 34581 transitions. Word has length 111 [2021-11-07 00:57:42,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:42,174 INFO L470 AbstractCegarLoop]: Abstraction has 19316 states and 34581 transitions. [2021-11-07 00:57:42,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:42,175 INFO L276 IsEmpty]: Start isEmpty. Operand 19316 states and 34581 transitions. [2021-11-07 00:57:42,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 00:57:42,200 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:42,201 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:42,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:42,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:42,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:42,602 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:42,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:42,602 INFO L85 PathProgramCache]: Analyzing trace with hash -58339489, now seen corresponding path program 1 times [2021-11-07 00:57:42,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:42,603 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2085361851] [2021-11-07 00:57:42,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:42,603 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:42,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:42,604 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:42,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 00:57:43,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:43,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:43,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:44,072 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:44,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:44,449 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:44,449 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:44,450 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2085361851] [2021-11-07 00:57:44,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2085361851] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:44,450 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [585449110] [2021-11-07 00:57:44,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:44,450 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:44,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:44,451 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:44,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 00:57:46,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:46,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:46,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:46,352 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:46,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:46,659 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:46,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [585449110] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:46,659 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:46,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 00:57:46,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494083719] [2021-11-07 00:57:46,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:57:46,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:46,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:57:46,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:57:46,662 INFO L87 Difference]: Start difference. First operand 19316 states and 34581 transitions. Second operand has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:47,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:47,856 INFO L93 Difference]: Finished difference Result 19473 states and 34839 transitions. [2021-11-07 00:57:47,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:57:47,857 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-07 00:57:47,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:47,886 INFO L225 Difference]: With dead ends: 19473 [2021-11-07 00:57:47,886 INFO L226 Difference]: Without dead ends: 19315 [2021-11-07 00:57:47,891 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:57:47,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19315 states. [2021-11-07 00:57:49,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19315 to 19315. [2021-11-07 00:57:49,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19315 states, 19314 states have (on average 1.7902557730143938) internal successors, (34577), 19314 states have internal predecessors, (34577), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:49,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19315 states to 19315 states and 34577 transitions. [2021-11-07 00:57:49,310 INFO L78 Accepts]: Start accepts. Automaton has 19315 states and 34577 transitions. Word has length 112 [2021-11-07 00:57:49,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:49,310 INFO L470 AbstractCegarLoop]: Abstraction has 19315 states and 34577 transitions. [2021-11-07 00:57:49,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:49,311 INFO L276 IsEmpty]: Start isEmpty. Operand 19315 states and 34577 transitions. [2021-11-07 00:57:49,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-07 00:57:49,335 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:49,335 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:49,360 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-07 00:57:49,554 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Ended with exit code 0 [2021-11-07 00:57:49,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:49,749 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:49,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:49,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1966673289, now seen corresponding path program 1 times [2021-11-07 00:57:49,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:49,750 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [957581175] [2021-11-07 00:57:49,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:49,750 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:49,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:49,751 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:49,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 00:57:50,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:51,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:51,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:51,285 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:51,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:51,608 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:51,608 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:51,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [957581175] [2021-11-07 00:57:51,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [957581175] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:51,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2006118992] [2021-11-07 00:57:51,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:51,609 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:51,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:51,610 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:51,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 00:57:53,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:53,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:57:53,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:53,986 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:53,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:54,618 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:54,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2006118992] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:54,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:54,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:57:54,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327249692] [2021-11-07 00:57:54,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:57:54,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:54,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:57:54,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:57:54,621 INFO L87 Difference]: Start difference. First operand 19315 states and 34577 transitions. Second operand has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:15,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:15,978 INFO L93 Difference]: Finished difference Result 39684 states and 70837 transitions. [2021-11-07 00:58:15,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 00:58:15,978 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-07 00:58:15,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:16,035 INFO L225 Difference]: With dead ends: 39684 [2021-11-07 00:58:16,035 INFO L226 Difference]: Without dead ends: 39446 [2021-11-07 00:58:16,043 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 428 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=195, Invalid=675, Unknown=0, NotChecked=0, Total=870 [2021-11-07 00:58:16,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39446 states. [2021-11-07 00:58:18,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39446 to 38360. [2021-11-07 00:58:18,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38360 states, 38359 states have (on average 1.7910529471571208) internal successors, (68703), 38359 states have internal predecessors, (68703), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:18,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38360 states to 38360 states and 68703 transitions. [2021-11-07 00:58:18,868 INFO L78 Accepts]: Start accepts. Automaton has 38360 states and 68703 transitions. Word has length 113 [2021-11-07 00:58:18,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:18,868 INFO L470 AbstractCegarLoop]: Abstraction has 38360 states and 68703 transitions. [2021-11-07 00:58:18,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:18,869 INFO L276 IsEmpty]: Start isEmpty. Operand 38360 states and 68703 transitions. [2021-11-07 00:58:18,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-07 00:58:18,941 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:18,941 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:18,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:19,167 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Ended with exit code 0 [2021-11-07 00:58:19,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:19,362 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:19,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:19,362 INFO L85 PathProgramCache]: Analyzing trace with hash -789953977, now seen corresponding path program 1 times [2021-11-07 00:58:19,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:19,363 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [454455336] [2021-11-07 00:58:19,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:19,364 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:19,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:19,365 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:19,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 00:58:20,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:20,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:20,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:21,059 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:21,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:21,387 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:21,387 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:21,387 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [454455336] [2021-11-07 00:58:21,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [454455336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:21,388 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1035901581] [2021-11-07 00:58:21,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:21,388 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:21,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:21,389 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:21,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 00:58:23,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:23,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 00:58:23,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:23,611 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:23,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:24,021 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:24,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1035901581] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:24,021 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:24,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 00:58:24,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731312185] [2021-11-07 00:58:24,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:58:24,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:24,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:58:24,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:58:24,024 INFO L87 Difference]: Start difference. First operand 38360 states and 68703 transitions. Second operand has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:26,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:26,891 INFO L93 Difference]: Finished difference Result 40735 states and 72582 transitions. [2021-11-07 00:58:26,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 00:58:26,893 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-07 00:58:26,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:26,959 INFO L225 Difference]: With dead ends: 40735 [2021-11-07 00:58:26,959 INFO L226 Difference]: Without dead ends: 39405 [2021-11-07 00:58:26,973 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-07 00:58:27,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39405 states. [2021-11-07 00:58:29,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39405 to 38416. [2021-11-07 00:58:29,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38416 states, 38415 states have (on average 1.7905245346869711) internal successors, (68783), 38415 states have internal predecessors, (68783), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:29,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38416 states to 38416 states and 68783 transitions. [2021-11-07 00:58:29,646 INFO L78 Accepts]: Start accepts. Automaton has 38416 states and 68783 transitions. Word has length 113 [2021-11-07 00:58:29,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:29,647 INFO L470 AbstractCegarLoop]: Abstraction has 38416 states and 68783 transitions. [2021-11-07 00:58:29,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:29,647 INFO L276 IsEmpty]: Start isEmpty. Operand 38416 states and 68783 transitions. [2021-11-07 00:58:29,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-07 00:58:29,694 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:29,694 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:29,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:29,901 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-11-07 00:58:30,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:30,097 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:30,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:30,097 INFO L85 PathProgramCache]: Analyzing trace with hash 1696535569, now seen corresponding path program 1 times [2021-11-07 00:58:30,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:30,098 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2116162639] [2021-11-07 00:58:30,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:30,098 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:30,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:30,099 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:30,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 00:58:31,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:31,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:31,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:31,801 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:31,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:32,211 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:32,211 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:32,211 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2116162639] [2021-11-07 00:58:32,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2116162639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:32,212 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1945620716] [2021-11-07 00:58:32,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:32,212 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:32,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:32,213 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:32,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 00:58:34,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:34,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 00:58:34,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:34,643 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:34,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:34,936 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:34,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1945620716] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:34,937 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:34,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 00:58:34,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543841019] [2021-11-07 00:58:34,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 00:58:34,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:34,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 00:58:34,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 00:58:34,938 INFO L87 Difference]: Start difference. First operand 38416 states and 68783 transitions. Second operand has 9 states, 9 states have (on average 12.0) internal successors, (108), 9 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:38,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:38,116 INFO L93 Difference]: Finished difference Result 39088 states and 69879 transitions. [2021-11-07 00:58:38,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 00:58:38,116 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 12.0) internal successors, (108), 9 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-07 00:58:38,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:38,177 INFO L225 Difference]: With dead ends: 39088 [2021-11-07 00:58:38,177 INFO L226 Difference]: Without dead ends: 38665 [2021-11-07 00:58:38,184 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=165, Invalid=591, Unknown=0, NotChecked=0, Total=756 [2021-11-07 00:58:38,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38665 states. [2021-11-07 00:58:40,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38665 to 38352. [2021-11-07 00:58:40,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38352 states, 38351 states have (on average 1.7906964616307266) internal successors, (68675), 38351 states have internal predecessors, (68675), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:40,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38352 states to 38352 states and 68675 transitions. [2021-11-07 00:58:40,770 INFO L78 Accepts]: Start accepts. Automaton has 38352 states and 68675 transitions. Word has length 114 [2021-11-07 00:58:40,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:40,771 INFO L470 AbstractCegarLoop]: Abstraction has 38352 states and 68675 transitions. [2021-11-07 00:58:40,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 12.0) internal successors, (108), 9 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:40,771 INFO L276 IsEmpty]: Start isEmpty. Operand 38352 states and 68675 transitions. [2021-11-07 00:58:40,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 00:58:40,814 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:40,815 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:40,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:41,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:41,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:41,216 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:41,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:41,216 INFO L85 PathProgramCache]: Analyzing trace with hash 406703181, now seen corresponding path program 1 times [2021-11-07 00:58:41,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:41,217 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1961417291] [2021-11-07 00:58:41,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:41,217 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:41,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:41,218 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:41,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 00:58:42,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:42,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:42,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:43,063 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:43,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:43,437 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:43,438 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:43,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1961417291] [2021-11-07 00:58:43,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1961417291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:43,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1537864546] [2021-11-07 00:58:43,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:43,439 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:43,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:43,441 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:43,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 00:58:45,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:45,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 00:58:45,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:45,949 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:45,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:46,196 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:46,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1537864546] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:46,196 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:46,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 00:58:46,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033324812] [2021-11-07 00:58:46,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:46,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:46,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:46,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:58:46,198 INFO L87 Difference]: Start difference. First operand 38352 states and 68675 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:48,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:48,709 INFO L93 Difference]: Finished difference Result 38952 states and 69622 transitions. [2021-11-07 00:58:48,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:58:48,710 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 00:58:48,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:48,769 INFO L225 Difference]: With dead ends: 38952 [2021-11-07 00:58:48,770 INFO L226 Difference]: Without dead ends: 38510 [2021-11-07 00:58:48,777 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:58:48,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38510 states. [2021-11-07 00:58:51,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38510 to 38351. [2021-11-07 00:58:51,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38351 states, 38350 states have (on average 1.7902477183833116) internal successors, (68656), 38350 states have internal predecessors, (68656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:51,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38351 states to 38351 states and 68656 transitions. [2021-11-07 00:58:51,736 INFO L78 Accepts]: Start accepts. Automaton has 38351 states and 68656 transitions. Word has length 116 [2021-11-07 00:58:51,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:51,737 INFO L470 AbstractCegarLoop]: Abstraction has 38351 states and 68656 transitions. [2021-11-07 00:58:51,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:51,737 INFO L276 IsEmpty]: Start isEmpty. Operand 38351 states and 68656 transitions. [2021-11-07 00:58:51,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 00:58:51,783 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:51,783 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:51,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:52,003 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-07 00:58:52,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:52,184 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:52,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:52,185 INFO L85 PathProgramCache]: Analyzing trace with hash 837820183, now seen corresponding path program 1 times [2021-11-07 00:58:52,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:52,185 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [951293904] [2021-11-07 00:58:52,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:52,186 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:52,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:52,187 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:52,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 00:58:53,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:53,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:53,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:54,260 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:54,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:54,607 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:54,607 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:54,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [951293904] [2021-11-07 00:58:54,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [951293904] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:54,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1776704885] [2021-11-07 00:58:54,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:54,608 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:54,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:54,618 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:54,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 00:58:56,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:56,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:58:56,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:57,300 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:57,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:57,645 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:57,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1776704885] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:57,646 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:57,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 00:58:57,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802865999] [2021-11-07 00:58:57,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 00:58:57,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:57,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 00:58:57,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 00:58:57,647 INFO L87 Difference]: Start difference. First operand 38351 states and 68656 transitions. Second operand has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:02,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:02,541 INFO L93 Difference]: Finished difference Result 38945 states and 69595 transitions. [2021-11-07 00:59:02,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 00:59:02,541 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 00:59:02,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:02,602 INFO L225 Difference]: With dead ends: 38945 [2021-11-07 00:59:02,602 INFO L226 Difference]: Without dead ends: 38478 [2021-11-07 00:59:02,609 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 449 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-07 00:59:02,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38478 states. [2021-11-07 00:59:05,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38478 to 38325. [2021-11-07 00:59:05,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38325 states, 38324 states have (on average 1.7902880701388164) internal successors, (68611), 38324 states have internal predecessors, (68611), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:05,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38325 states to 38325 states and 68611 transitions. [2021-11-07 00:59:05,511 INFO L78 Accepts]: Start accepts. Automaton has 38325 states and 68611 transitions. Word has length 116 [2021-11-07 00:59:05,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:05,511 INFO L470 AbstractCegarLoop]: Abstraction has 38325 states and 68611 transitions. [2021-11-07 00:59:05,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:05,512 INFO L276 IsEmpty]: Start isEmpty. Operand 38325 states and 68611 transitions. [2021-11-07 00:59:05,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 00:59:05,557 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:05,557 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:05,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:05,767 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-11-07 00:59:05,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:05,958 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:05,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:05,959 INFO L85 PathProgramCache]: Analyzing trace with hash 1843067694, now seen corresponding path program 1 times [2021-11-07 00:59:05,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:05,960 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1877266396] [2021-11-07 00:59:05,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:05,960 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:05,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:05,962 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:05,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 00:59:07,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:07,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:07,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:08,084 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:08,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:08,423 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:08,423 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:08,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1877266396] [2021-11-07 00:59:08,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1877266396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:08,424 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1936457154] [2021-11-07 00:59:08,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:08,424 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:08,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:08,425 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:08,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 00:59:10,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:10,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 00:59:10,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:10,992 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:10,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:11,234 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:11,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1936457154] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:11,235 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:11,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 00:59:11,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019633541] [2021-11-07 00:59:11,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:59:11,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:11,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:59:11,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 00:59:11,236 INFO L87 Difference]: Start difference. First operand 38325 states and 68611 transitions. Second operand has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:13,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:13,922 INFO L93 Difference]: Finished difference Result 38943 states and 69604 transitions. [2021-11-07 00:59:13,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:59:13,922 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 00:59:13,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:13,977 INFO L225 Difference]: With dead ends: 38943 [2021-11-07 00:59:13,977 INFO L226 Difference]: Without dead ends: 38465 [2021-11-07 00:59:13,984 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:59:14,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38465 states. [2021-11-07 00:59:16,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38465 to 38061. [2021-11-07 00:59:16,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38061 states, 38060 states have (on average 1.7861271676300579) internal successors, (67980), 38060 states have internal predecessors, (67980), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:16,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38061 states to 38061 states and 67980 transitions. [2021-11-07 00:59:16,616 INFO L78 Accepts]: Start accepts. Automaton has 38061 states and 67980 transitions. Word has length 116 [2021-11-07 00:59:16,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:16,617 INFO L470 AbstractCegarLoop]: Abstraction has 38061 states and 67980 transitions. [2021-11-07 00:59:16,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:16,617 INFO L276 IsEmpty]: Start isEmpty. Operand 38061 states and 67980 transitions. [2021-11-07 00:59:16,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-07 00:59:16,664 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:16,664 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:16,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:16,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:17,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:17,065 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:17,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:17,066 INFO L85 PathProgramCache]: Analyzing trace with hash 972614723, now seen corresponding path program 1 times [2021-11-07 00:59:17,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:17,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2139747790] [2021-11-07 00:59:17,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:17,067 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:17,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:17,068 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:17,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_18913fd3-29c7-44c2-be39-328dd6481a6f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 00:59:18,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:18,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:59:18,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:19,196 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:59:19,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:19,567 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:59:19,567 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:19,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2139747790] [2021-11-07 00:59:19,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2139747790] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:19,568 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:19,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:59:19,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244353647] [2021-11-07 00:59:19,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:59:19,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:19,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:59:19,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:59:19,570 INFO L87 Difference]: Start difference. First operand 38061 states and 67980 transitions. Second operand has 6 states, 6 states have (on average 24.5) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:29,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:29,301 INFO L93 Difference]: Finished difference Result 139376 states and 247637 transitions. [2021-11-07 00:59:29,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 00:59:29,307 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 24.5) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-07 00:59:29,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:29,514 INFO L225 Difference]: With dead ends: 139376 [2021-11-07 00:59:29,515 INFO L226 Difference]: Without dead ends: 101562 [2021-11-07 00:59:29,563 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 240 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:59:29,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101562 states.