./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec27_product31.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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec27_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/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 d51a9662ec11e877bdc62fbff8cdf19fcc101bb2b0234c411e7900fe51bd7f38 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:04:30,863 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:04:30,865 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:04:30,909 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:04:30,910 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:04:30,911 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:04:30,913 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:04:30,915 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:04:30,918 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:04:30,919 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:04:30,920 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:04:30,922 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:04:30,922 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:04:30,924 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:04:30,926 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:04:30,928 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:04:30,929 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:04:30,931 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:04:30,933 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:04:30,935 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:04:30,938 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:04:30,950 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:04:30,952 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:04:30,953 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:04:30,956 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:04:30,957 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:04:30,957 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:04:30,958 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:04:30,959 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:04:30,960 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:04:30,960 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:04:30,961 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:04:30,962 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:04:30,963 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:04:30,970 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:04:30,970 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:04:30,971 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:04:30,971 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:04:30,972 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:04:30,973 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:04:30,974 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:04:30,976 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 02:04:31,020 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:04:31,023 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:04:31,024 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:04:31,026 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:04:31,026 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:04:31,026 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:04:31,026 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:04:31,027 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:04:31,027 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:04:31,027 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:04:31,031 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:04:31,032 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:04:31,032 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:04:31,032 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:04:31,033 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:04:31,033 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:04:31,034 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:04:31,034 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:04:31,034 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:04:31,034 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:04:31,034 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:04:31,035 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:04:31,035 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:04:31,035 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:04:31,035 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:04:31,036 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:04:31,036 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:04:31,036 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:04:31,036 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:04:31,037 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:04:31,037 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:04:31,037 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:04:31,037 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:04:31,038 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:04:31,038 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:04:31,038 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:04:31,038 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:04:31,039 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:04:31,039 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:04:31,039 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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d51a9662ec11e877bdc62fbff8cdf19fcc101bb2b0234c411e7900fe51bd7f38 [2021-11-07 02:04:31,330 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:04:31,351 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:04:31,354 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:04:31,355 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:04:31,356 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:04:31,357 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec27_product31.cil.c [2021-11-07 02:04:31,421 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data/82b9b485b/4ad86fa56540433fb0b351c4e48accb4/FLAG74c630ca3 [2021-11-07 02:04:32,103 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:04:32,104 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/sv-benchmarks/c/product-lines/email_spec27_product31.cil.c [2021-11-07 02:04:32,126 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data/82b9b485b/4ad86fa56540433fb0b351c4e48accb4/FLAG74c630ca3 [2021-11-07 02:04:32,298 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data/82b9b485b/4ad86fa56540433fb0b351c4e48accb4 [2021-11-07 02:04:32,301 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:04:32,302 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:04:32,305 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:04:32,305 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:04:32,309 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:04:32,310 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:32" (1/1) ... [2021-11-07 02:04:32,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b8f7482 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:32, skipping insertion in model container [2021-11-07 02:04:32,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:32" (1/1) ... [2021-11-07 02:04:32,321 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:04:32,391 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:04:33,073 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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/sv-benchmarks/c/product-lines/email_spec27_product31.cil.c[61351,61364] [2021-11-07 02:04:33,101 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:04:33,118 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 02:04:33,118 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@10692a33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:33, skipping insertion in model container [2021-11-07 02:04:33,119 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:04:33,119 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 02:04:33,122 INFO L168 Benchmark]: Toolchain (without parser) took 817.80 ms. Allocated memory is still 113.2 MB. Free memory was 71.5 MB in the beginning and 74.1 MB in the end (delta: -2.6 MB). Peak memory consumption was 10.9 MB. Max. memory is 16.1 GB. [2021-11-07 02:04:33,123 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 113.2 MB. Free memory is still 90.8 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:04:33,125 INFO L168 Benchmark]: CACSL2BoogieTranslator took 814.41 ms. Allocated memory is still 113.2 MB. Free memory was 71.3 MB in the beginning and 74.1 MB in the end (delta: -2.7 MB). Peak memory consumption was 10.9 MB. Max. memory is 16.1 GB. [2021-11-07 02:04:33,127 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 113.2 MB. Free memory is still 90.8 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 814.41 ms. Allocated memory is still 113.2 MB. Free memory was 71.3 MB in the beginning and 74.1 MB in the end (delta: -2.7 MB). Peak memory consumption was 10.9 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 2159]: 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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec27_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/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 d51a9662ec11e877bdc62fbff8cdf19fcc101bb2b0234c411e7900fe51bd7f38 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:04:35,488 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:04:35,490 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:04:35,536 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:04:35,537 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:04:35,544 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:04:35,550 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:04:35,555 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:04:35,558 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:04:35,565 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:04:35,567 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:04:35,569 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:04:35,569 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:04:35,572 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:04:35,574 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:04:35,579 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:04:35,581 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:04:35,582 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:04:35,584 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:04:35,591 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:04:35,594 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:04:35,597 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:04:35,598 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:04:35,601 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:04:35,607 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:04:35,611 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:04:35,611 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:04:35,612 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:04:35,614 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:04:35,615 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:04:35,617 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:04:35,618 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:04:35,620 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:04:35,621 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:04:35,623 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:04:35,623 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:04:35,624 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:04:35,625 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:04:35,625 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:04:35,627 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:04:35,628 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:04:35,633 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 02:04:35,686 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:04:35,687 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:04:35,688 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:04:35,688 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:04:35,689 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:04:35,689 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:04:35,689 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:04:35,690 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:04:35,691 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:04:35,693 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:04:35,694 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:04:35,694 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:04:35,694 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:04:35,695 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:04:35,695 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:04:35,695 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:04:35,695 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:04:35,696 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 02:04:35,696 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 02:04:35,696 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:04:35,696 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:04:35,697 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:04:35,697 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:04:35,697 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:04:35,698 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 02:04:35,698 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:04:35,698 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:04:35,698 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:04:35,699 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:04:35,699 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:04:35,699 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 02:04:35,699 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 02:04:35,700 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:04:35,700 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:04:35,701 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:04:35,701 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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d51a9662ec11e877bdc62fbff8cdf19fcc101bb2b0234c411e7900fe51bd7f38 [2021-11-07 02:04:36,136 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:04:36,164 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:04:36,167 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:04:36,168 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:04:36,169 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:04:36,170 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec27_product31.cil.c [2021-11-07 02:04:36,247 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data/d36107386/f0563eb44f6249aea65a564d44d8b1c9/FLAGceb4d11d8 [2021-11-07 02:04:36,928 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:04:36,928 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/sv-benchmarks/c/product-lines/email_spec27_product31.cil.c [2021-11-07 02:04:36,950 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data/d36107386/f0563eb44f6249aea65a564d44d8b1c9/FLAGceb4d11d8 [2021-11-07 02:04:37,139 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/data/d36107386/f0563eb44f6249aea65a564d44d8b1c9 [2021-11-07 02:04:37,142 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:04:37,143 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:04:37,145 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:04:37,146 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:04:37,149 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:04:37,150 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:37" (1/1) ... [2021-11-07 02:04:37,151 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@184a07a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:37, skipping insertion in model container [2021-11-07 02:04:37,151 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:37" (1/1) ... [2021-11-07 02:04:37,159 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:04:37,263 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:04:37,829 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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/sv-benchmarks/c/product-lines/email_spec27_product31.cil.c[61351,61364] [2021-11-07 02:04:37,859 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:04:37,891 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 02:04:37,914 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:04:38,045 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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/sv-benchmarks/c/product-lines/email_spec27_product31.cil.c[61351,61364] [2021-11-07 02:04:38,065 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:04:38,071 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:04:38,194 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_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/sv-benchmarks/c/product-lines/email_spec27_product31.cil.c[61351,61364] [2021-11-07 02:04:38,197 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:04:38,254 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:04:38,255 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38 WrapperNode [2021-11-07 02:04:38,255 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:04:38,257 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:04:38,257 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:04:38,257 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:04:38,265 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,330 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,431 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:04:38,432 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:04:38,432 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:04:38,432 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:04:38,441 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,441 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,453 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,453 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,523 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,583 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,591 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,615 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:04:38,616 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:04:38,616 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:04:38,616 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:04:38,618 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (1/1) ... [2021-11-07 02:04:38,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:04:38,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:04:38,655 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:04:38,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:04:38,696 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 02:04:38,696 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:04:38,696 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 02:04:38,696 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:04:38,697 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:04:43,466 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:04:43,466 INFO L299 CfgBuilder]: Removed 379 assume(true) statements. [2021-11-07 02:04:43,470 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:04:43 BoogieIcfgContainer [2021-11-07 02:04:43,470 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:04:43,472 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:04:43,472 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:04:43,475 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:04:43,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:04:37" (1/3) ... [2021-11-07 02:04:43,477 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c49be75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:04:43, skipping insertion in model container [2021-11-07 02:04:43,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:38" (2/3) ... [2021-11-07 02:04:43,477 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c49be75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:04:43, skipping insertion in model container [2021-11-07 02:04:43,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:04:43" (3/3) ... [2021-11-07 02:04:43,479 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec27_product31.cil.c [2021-11-07 02:04:43,485 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:04:43,485 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 02:04:43,545 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:04:43,552 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 02:04:43,552 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 02:04:43,607 INFO L276 IsEmpty]: Start isEmpty. Operand has 585 states, 582 states have (on average 1.7422680412371134) internal successors, (1014), 584 states have internal predecessors, (1014), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:43,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-07 02:04:43,641 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:43,642 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] [2021-11-07 02:04:43,642 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:43,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:43,653 INFO L85 PathProgramCache]: Analyzing trace with hash 1232814721, now seen corresponding path program 1 times [2021-11-07 02:04:43,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:43,670 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [353755909] [2021-11-07 02:04:43,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:43,671 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:43,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:43,679 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:43,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 02:04:44,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:44,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 523 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 02:04:44,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:44,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:44,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:44,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:44,591 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:44,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [353755909] [2021-11-07 02:04:44,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [353755909] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:44,592 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:44,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 02:04:44,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81119707] [2021-11-07 02:04:44,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 02:04:44,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:44,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 02:04:44,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 02:04:44,617 INFO L87 Difference]: Start difference. First operand has 585 states, 582 states have (on average 1.7422680412371134) internal successors, (1014), 584 states have internal predecessors, (1014), 0 states have call successors, (0), 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 31.0) internal successors, (62), 2 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:44,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:44,677 INFO L93 Difference]: Finished difference Result 928 states and 1587 transitions. [2021-11-07 02:04:44,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 02:04:44,679 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 31.0) internal successors, (62), 2 states have internal predecessors, (62), 0 states have call successors, (0), 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 62 [2021-11-07 02:04:44,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:44,699 INFO L225 Difference]: With dead ends: 928 [2021-11-07 02:04:44,699 INFO L226 Difference]: Without dead ends: 537 [2021-11-07 02:04:44,705 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 122 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 02:04:44,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2021-11-07 02:04:44,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 537. [2021-11-07 02:04:44,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 537 states, 535 states have (on average 1.7457943925233645) internal successors, (934), 536 states have internal predecessors, (934), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:44,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 537 states to 537 states and 934 transitions. [2021-11-07 02:04:44,863 INFO L78 Accepts]: Start accepts. Automaton has 537 states and 934 transitions. Word has length 62 [2021-11-07 02:04:44,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:44,863 INFO L470 AbstractCegarLoop]: Abstraction has 537 states and 934 transitions. [2021-11-07 02:04:44,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 31.0) internal successors, (62), 2 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:44,864 INFO L276 IsEmpty]: Start isEmpty. Operand 537 states and 934 transitions. [2021-11-07 02:04:44,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-07 02:04:44,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:44,873 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] [2021-11-07 02:04:44,892 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:45,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:45,088 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:45,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:45,089 INFO L85 PathProgramCache]: Analyzing trace with hash -1274086930, now seen corresponding path program 1 times [2021-11-07 02:04:45,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:45,090 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [84683367] [2021-11-07 02:04:45,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:45,090 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:45,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:45,092 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:45,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 02:04:45,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:45,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:04:45,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:45,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:45,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:45,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:45,880 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:45,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [84683367] [2021-11-07 02:04:45,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [84683367] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:45,881 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:45,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:04:45,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467106518] [2021-11-07 02:04:45,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:04:45,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:45,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:04:45,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:45,885 INFO L87 Difference]: Start difference. First operand 537 states and 934 transitions. Second operand has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 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 02:04:46,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:46,001 INFO L93 Difference]: Finished difference Result 1581 states and 2754 transitions. [2021-11-07 02:04:46,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:04:46,002 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 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 63 [2021-11-07 02:04:46,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:46,013 INFO L225 Difference]: With dead ends: 1581 [2021-11-07 02:04:46,013 INFO L226 Difference]: Without dead ends: 1059 [2021-11-07 02:04:46,016 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:46,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1059 states. [2021-11-07 02:04:46,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1059 to 536. [2021-11-07 02:04:46,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 536 states, 534 states have (on average 1.7397003745318351) internal successors, (929), 535 states have internal predecessors, (929), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:46,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 929 transitions. [2021-11-07 02:04:46,090 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 929 transitions. Word has length 63 [2021-11-07 02:04:46,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:46,091 INFO L470 AbstractCegarLoop]: Abstraction has 536 states and 929 transitions. [2021-11-07 02:04:46,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 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 02:04:46,091 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 929 transitions. [2021-11-07 02:04:46,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 02:04:46,094 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:46,094 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 02:04:46,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:46,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:46,310 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:46,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:46,311 INFO L85 PathProgramCache]: Analyzing trace with hash 506245844, now seen corresponding path program 1 times [2021-11-07 02:04:46,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:46,312 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1189729369] [2021-11-07 02:04:46,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:46,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:46,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:46,323 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:46,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 02:04:46,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:46,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:04:46,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:47,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:47,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:47,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:47,235 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:47,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1189729369] [2021-11-07 02:04:47,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1189729369] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:47,236 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:47,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:04:47,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764173353] [2021-11-07 02:04:47,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:04:47,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:47,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:04:47,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:04:47,238 INFO L87 Difference]: Start difference. First operand 536 states and 929 transitions. Second operand has 6 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:47,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:47,539 INFO L93 Difference]: Finished difference Result 2061 states and 3578 transitions. [2021-11-07 02:04:47,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:04:47,540 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 0 states have call successors, (0), 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 02:04:47,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:47,552 INFO L225 Difference]: With dead ends: 2061 [2021-11-07 02:04:47,552 INFO L226 Difference]: Without dead ends: 1543 [2021-11-07 02:04:47,554 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 124 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 02:04:47,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1543 states. [2021-11-07 02:04:47,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1543 to 535. [2021-11-07 02:04:47,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 533 states have (on average 1.7354596622889307) internal successors, (925), 534 states have internal predecessors, (925), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:47,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 925 transitions. [2021-11-07 02:04:47,623 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 925 transitions. Word has length 65 [2021-11-07 02:04:47,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:47,624 INFO L470 AbstractCegarLoop]: Abstraction has 535 states and 925 transitions. [2021-11-07 02:04:47,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.666666666666666) internal successors, (70), 6 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:47,626 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 925 transitions. [2021-11-07 02:04:47,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 02:04:47,630 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:47,630 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 02:04:47,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:47,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:47,848 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:47,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:47,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1516164825, now seen corresponding path program 1 times [2021-11-07 02:04:47,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:47,850 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [763255748] [2021-11-07 02:04:47,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:47,850 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:47,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:47,854 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:47,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 02:04:48,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:48,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:04:48,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:48,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:48,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:48,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:48,745 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:48,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [763255748] [2021-11-07 02:04:48,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [763255748] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:48,746 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:48,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:04:48,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749037007] [2021-11-07 02:04:48,746 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:04:48,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:48,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:04:48,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:48,747 INFO L87 Difference]: Start difference. First operand 535 states and 925 transitions. Second operand has 4 states, 4 states have (on average 17.25) internal successors, (69), 4 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 02:04:48,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:48,829 INFO L93 Difference]: Finished difference Result 1067 states and 1847 transitions. [2021-11-07 02:04:48,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:04:48,830 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.25) internal successors, (69), 4 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 66 [2021-11-07 02:04:48,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:48,834 INFO L225 Difference]: With dead ends: 1067 [2021-11-07 02:04:48,834 INFO L226 Difference]: Without dead ends: 540 [2021-11-07 02:04:48,835 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 02:04:48,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-11-07 02:04:48,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 535. [2021-11-07 02:04:48,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 533 states have (on average 1.7298311444652907) internal successors, (922), 534 states have internal predecessors, (922), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:48,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 922 transitions. [2021-11-07 02:04:48,882 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 922 transitions. Word has length 66 [2021-11-07 02:04:48,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:48,884 INFO L470 AbstractCegarLoop]: Abstraction has 535 states and 922 transitions. [2021-11-07 02:04:48,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.25) internal successors, (69), 4 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 02:04:48,884 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 922 transitions. [2021-11-07 02:04:48,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 02:04:48,886 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:48,887 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 02:04:48,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:49,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:49,101 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:49,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:49,101 INFO L85 PathProgramCache]: Analyzing trace with hash -649267268, now seen corresponding path program 1 times [2021-11-07 02:04:49,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:49,103 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [368507159] [2021-11-07 02:04:49,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:49,104 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:49,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:49,105 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:49,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 02:04:49,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:49,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:04:49,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:49,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:49,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:50,026 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:50,027 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:50,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [368507159] [2021-11-07 02:04:50,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [368507159] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:50,027 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:50,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:04:50,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899675287] [2021-11-07 02:04:50,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:04:50,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:50,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:04:50,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:04:50,030 INFO L87 Difference]: Start difference. First operand 535 states and 922 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 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 02:04:50,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:50,307 INFO L93 Difference]: Finished difference Result 2048 states and 3554 transitions. [2021-11-07 02:04:50,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:04:50,308 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 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 67 [2021-11-07 02:04:50,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:50,319 INFO L225 Difference]: With dead ends: 2048 [2021-11-07 02:04:50,320 INFO L226 Difference]: Without dead ends: 1539 [2021-11-07 02:04:50,321 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 128 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 02:04:50,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1539 states. [2021-11-07 02:04:50,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1539 to 535. [2021-11-07 02:04:50,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 533 states have (on average 1.724202626641651) internal successors, (919), 534 states have internal predecessors, (919), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:50,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 919 transitions. [2021-11-07 02:04:50,375 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 919 transitions. Word has length 67 [2021-11-07 02:04:50,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:50,376 INFO L470 AbstractCegarLoop]: Abstraction has 535 states and 919 transitions. [2021-11-07 02:04:50,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 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 02:04:50,376 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 919 transitions. [2021-11-07 02:04:50,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 02:04:50,378 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:50,379 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 02:04:50,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:50,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:50,598 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:50,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:50,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1696413047, now seen corresponding path program 1 times [2021-11-07 02:04:50,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:50,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1755735272] [2021-11-07 02:04:50,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:50,600 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:50,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:50,601 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:50,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 02:04:51,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:51,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:04:51,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:51,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:51,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:51,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:51,542 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:51,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1755735272] [2021-11-07 02:04:51,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1755735272] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:51,543 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:51,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:04:51,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590330372] [2021-11-07 02:04:51,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:04:51,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:51,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:04:51,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:51,545 INFO L87 Difference]: Start difference. First operand 535 states and 919 transitions. Second operand has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:51,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:51,658 INFO L93 Difference]: Finished difference Result 1339 states and 2304 transitions. [2021-11-07 02:04:51,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:04:51,659 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 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 02:04:51,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:51,666 INFO L225 Difference]: With dead ends: 1339 [2021-11-07 02:04:51,666 INFO L226 Difference]: Without dead ends: 1044 [2021-11-07 02:04:51,668 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:51,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1044 states. [2021-11-07 02:04:51,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1044 to 749. [2021-11-07 02:04:51,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 749 states, 747 states have (on average 1.7536813922356091) internal successors, (1310), 748 states have internal predecessors, (1310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:51,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 749 states to 749 states and 1310 transitions. [2021-11-07 02:04:51,740 INFO L78 Accepts]: Start accepts. Automaton has 749 states and 1310 transitions. Word has length 69 [2021-11-07 02:04:51,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:51,741 INFO L470 AbstractCegarLoop]: Abstraction has 749 states and 1310 transitions. [2021-11-07 02:04:51,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:51,741 INFO L276 IsEmpty]: Start isEmpty. Operand 749 states and 1310 transitions. [2021-11-07 02:04:51,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-07 02:04:51,743 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:51,744 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:51,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:51,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:51,957 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:51,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:51,957 INFO L85 PathProgramCache]: Analyzing trace with hash 1297168392, now seen corresponding path program 1 times [2021-11-07 02:04:51,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:51,958 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1465115353] [2021-11-07 02:04:51,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:51,958 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:51,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:51,959 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:51,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 02:04:52,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:52,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:04:52,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:52,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:52,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:52,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:52,918 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:52,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1465115353] [2021-11-07 02:04:52,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1465115353] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:52,919 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:52,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:04:52,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649987443] [2021-11-07 02:04:52,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:04:52,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:52,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:04:52,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:04:52,920 INFO L87 Difference]: Start difference. First operand 749 states and 1310 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:53,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:53,025 INFO L93 Difference]: Finished difference Result 1871 states and 3278 transitions. [2021-11-07 02:04:53,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:04:53,026 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-07 02:04:53,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:53,033 INFO L225 Difference]: With dead ends: 1871 [2021-11-07 02:04:53,033 INFO L226 Difference]: Without dead ends: 1206 [2021-11-07 02:04:53,035 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:04:53,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1206 states. [2021-11-07 02:04:53,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1206 to 911. [2021-11-07 02:04:53,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 911 states, 909 states have (on average 1.7645764576457645) internal successors, (1604), 910 states have internal predecessors, (1604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:53,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 911 states to 911 states and 1604 transitions. [2021-11-07 02:04:53,131 INFO L78 Accepts]: Start accepts. Automaton has 911 states and 1604 transitions. Word has length 81 [2021-11-07 02:04:53,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:53,131 INFO L470 AbstractCegarLoop]: Abstraction has 911 states and 1604 transitions. [2021-11-07 02:04:53,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:53,132 INFO L276 IsEmpty]: Start isEmpty. Operand 911 states and 1604 transitions. [2021-11-07 02:04:53,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-07 02:04:53,134 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:53,134 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:53,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:53,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:53,349 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:53,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:53,349 INFO L85 PathProgramCache]: Analyzing trace with hash -862995929, now seen corresponding path program 1 times [2021-11-07 02:04:53,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:53,350 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1898553310] [2021-11-07 02:04:53,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:53,350 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:53,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:53,351 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:53,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 02:04:53,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:53,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:04:53,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:54,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:54,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:54,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:54,291 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:54,291 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1898553310] [2021-11-07 02:04:54,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1898553310] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:54,292 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:54,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:04:54,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502415603] [2021-11-07 02:04:54,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:04:54,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:54,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:04:54,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:04:54,293 INFO L87 Difference]: Start difference. First operand 911 states and 1604 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:54,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:54,456 INFO L93 Difference]: Finished difference Result 2401 states and 4246 transitions. [2021-11-07 02:04:54,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:04:54,456 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 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 82 [2021-11-07 02:04:54,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:54,466 INFO L225 Difference]: With dead ends: 2401 [2021-11-07 02:04:54,467 INFO L226 Difference]: Without dead ends: 1578 [2021-11-07 02:04:54,468 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:04:54,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1578 states. [2021-11-07 02:04:54,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1578 to 1283. [2021-11-07 02:04:54,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1283 states, 1281 states have (on average 1.7814207650273224) internal successors, (2282), 1282 states have internal predecessors, (2282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:54,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1283 states to 1283 states and 2282 transitions. [2021-11-07 02:04:54,572 INFO L78 Accepts]: Start accepts. Automaton has 1283 states and 2282 transitions. Word has length 82 [2021-11-07 02:04:54,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:54,572 INFO L470 AbstractCegarLoop]: Abstraction has 1283 states and 2282 transitions. [2021-11-07 02:04:54,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:54,573 INFO L276 IsEmpty]: Start isEmpty. Operand 1283 states and 2282 transitions. [2021-11-07 02:04:54,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 02:04:54,576 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:54,577 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:54,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:54,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:54,793 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:54,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:54,794 INFO L85 PathProgramCache]: Analyzing trace with hash 710120151, now seen corresponding path program 1 times [2021-11-07 02:04:54,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:54,794 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1892849976] [2021-11-07 02:04:54,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:54,794 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:54,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:54,795 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:54,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 02:04:55,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:55,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:04:55,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:55,552 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 02:04:55,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:55,759 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 02:04:55,759 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:55,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1892849976] [2021-11-07 02:04:55,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1892849976] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:55,760 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:55,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:04:55,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743634932] [2021-11-07 02:04:55,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:04:55,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:55,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:04:55,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:55,763 INFO L87 Difference]: Start difference. First operand 1283 states and 2282 transitions. Second operand has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:55,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:55,913 INFO L93 Difference]: Finished difference Result 2615 states and 4634 transitions. [2021-11-07 02:04:55,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:04:55,914 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 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 83 [2021-11-07 02:04:55,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:55,924 INFO L225 Difference]: With dead ends: 2615 [2021-11-07 02:04:55,924 INFO L226 Difference]: Without dead ends: 1578 [2021-11-07 02:04:55,926 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:55,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1578 states. [2021-11-07 02:04:56,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1578 to 1283. [2021-11-07 02:04:56,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1283 states, 1281 states have (on average 1.7798594847775175) internal successors, (2280), 1282 states have internal predecessors, (2280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:56,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1283 states to 1283 states and 2280 transitions. [2021-11-07 02:04:56,047 INFO L78 Accepts]: Start accepts. Automaton has 1283 states and 2280 transitions. Word has length 83 [2021-11-07 02:04:56,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:56,048 INFO L470 AbstractCegarLoop]: Abstraction has 1283 states and 2280 transitions. [2021-11-07 02:04:56,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.5) internal successors, (90), 4 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:56,048 INFO L276 IsEmpty]: Start isEmpty. Operand 1283 states and 2280 transitions. [2021-11-07 02:04:56,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 02:04:56,051 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:56,051 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:56,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:56,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:56,266 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:56,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:56,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1306817718, now seen corresponding path program 1 times [2021-11-07 02:04:56,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:56,267 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1769947658] [2021-11-07 02:04:56,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:56,268 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:56,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:56,269 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:56,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 02:04:56,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:56,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:04:56,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:57,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:57,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:57,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:57,200 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:57,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1769947658] [2021-11-07 02:04:57,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1769947658] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:57,200 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:57,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:04:57,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392489596] [2021-11-07 02:04:57,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:04:57,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:57,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:04:57,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:04:57,201 INFO L87 Difference]: Start difference. First operand 1283 states and 2280 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:57,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:57,381 INFO L93 Difference]: Finished difference Result 3489 states and 6229 transitions. [2021-11-07 02:04:57,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:04:57,381 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 0 states have call successors, (0), 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 83 [2021-11-07 02:04:57,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:57,396 INFO L225 Difference]: With dead ends: 3489 [2021-11-07 02:04:57,396 INFO L226 Difference]: Without dead ends: 2302 [2021-11-07 02:04:57,400 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 163 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:04:57,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2302 states. [2021-11-07 02:04:57,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2302 to 2007. [2021-11-07 02:04:57,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2007 states, 2005 states have (on average 1.79501246882793) internal successors, (3599), 2006 states have internal predecessors, (3599), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:57,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2007 states to 2007 states and 3599 transitions. [2021-11-07 02:04:57,557 INFO L78 Accepts]: Start accepts. Automaton has 2007 states and 3599 transitions. Word has length 83 [2021-11-07 02:04:57,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:57,557 INFO L470 AbstractCegarLoop]: Abstraction has 2007 states and 3599 transitions. [2021-11-07 02:04:57,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:57,557 INFO L276 IsEmpty]: Start isEmpty. Operand 2007 states and 3599 transitions. [2021-11-07 02:04:57,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-07 02:04:57,562 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:57,562 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:57,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:57,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:57,779 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:57,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:57,780 INFO L85 PathProgramCache]: Analyzing trace with hash 454298729, now seen corresponding path program 1 times [2021-11-07 02:04:57,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:57,780 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2083895399] [2021-11-07 02:04:57,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:57,781 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:57,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:57,782 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:57,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 02:04:58,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:58,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:04:58,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:58,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:58,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:58,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:58,865 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:58,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2083895399] [2021-11-07 02:04:58,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2083895399] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:58,865 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:58,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:04:58,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44617541] [2021-11-07 02:04:58,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:04:58,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:58,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:04:58,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:04:58,868 INFO L87 Difference]: Start difference. First operand 2007 states and 3599 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:59,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:59,106 INFO L93 Difference]: Finished difference Result 5397 states and 9705 transitions. [2021-11-07 02:04:59,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:04:59,107 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 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 84 [2021-11-07 02:04:59,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:59,129 INFO L225 Difference]: With dead ends: 5397 [2021-11-07 02:04:59,130 INFO L226 Difference]: Without dead ends: 3520 [2021-11-07 02:04:59,133 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:04:59,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3520 states. [2021-11-07 02:04:59,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3520 to 3225. [2021-11-07 02:04:59,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3225 states, 3223 states have (on average 1.8032888613093392) internal successors, (5812), 3224 states have internal predecessors, (5812), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:59,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3225 states to 3225 states and 5812 transitions. [2021-11-07 02:04:59,376 INFO L78 Accepts]: Start accepts. Automaton has 3225 states and 5812 transitions. Word has length 84 [2021-11-07 02:04:59,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:59,377 INFO L470 AbstractCegarLoop]: Abstraction has 3225 states and 5812 transitions. [2021-11-07 02:04:59,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:59,378 INFO L276 IsEmpty]: Start isEmpty. Operand 3225 states and 5812 transitions. [2021-11-07 02:04:59,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-07 02:04:59,389 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:59,390 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:59,412 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-11-07 02:04:59,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:59,605 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:59,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:59,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1330840327, now seen corresponding path program 1 times [2021-11-07 02:04:59,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:59,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1474207645] [2021-11-07 02:04:59,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:59,607 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:59,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:59,608 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:59,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 02:05:00,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:00,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:00,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:00,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:05:00,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:00,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:05:00,554 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:00,554 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1474207645] [2021-11-07 02:05:00,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1474207645] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:00,554 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:05:00,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:05:00,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821498184] [2021-11-07 02:05:00,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:00,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:00,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:00,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:05:00,555 INFO L87 Difference]: Start difference. First operand 3225 states and 5812 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:00,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:00,919 INFO L93 Difference]: Finished difference Result 8767 states and 15827 transitions. [2021-11-07 02:05:00,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:00,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 0 states have call successors, (0), 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 85 [2021-11-07 02:05:00,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:00,975 INFO L225 Difference]: With dead ends: 8767 [2021-11-07 02:05:00,976 INFO L226 Difference]: Without dead ends: 5706 [2021-11-07 02:05:00,980 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:05:00,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5706 states. [2021-11-07 02:05:01,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5706 to 5411. [2021-11-07 02:05:01,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5411 states, 5409 states have (on average 1.806803475688667) internal successors, (9773), 5410 states have internal predecessors, (9773), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:01,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5411 states to 5411 states and 9773 transitions. [2021-11-07 02:05:01,370 INFO L78 Accepts]: Start accepts. Automaton has 5411 states and 9773 transitions. Word has length 85 [2021-11-07 02:05:01,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:01,370 INFO L470 AbstractCegarLoop]: Abstraction has 5411 states and 9773 transitions. [2021-11-07 02:05:01,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:01,370 INFO L276 IsEmpty]: Start isEmpty. Operand 5411 states and 9773 transitions. [2021-11-07 02:05:01,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 02:05:01,379 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:01,380 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] [2021-11-07 02:05:01,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:01,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:01,595 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:01,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:01,595 INFO L85 PathProgramCache]: Analyzing trace with hash 1116046123, now seen corresponding path program 1 times [2021-11-07 02:05:01,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:01,596 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [645500585] [2021-11-07 02:05:01,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:01,596 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:01,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:01,599 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:01,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 02:05:02,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:02,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:05:02,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:02,594 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 02:05:02,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:02,819 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 02:05:02,819 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:02,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [645500585] [2021-11-07 02:05:02,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [645500585] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:02,820 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:05:02,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:05:02,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244154201] [2021-11-07 02:05:02,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:05:02,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:02,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:05:02,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:05:02,822 INFO L87 Difference]: Start difference. First operand 5411 states and 9773 transitions. Second operand has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 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 02:05:06,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:06,009 INFO L93 Difference]: Finished difference Result 20284 states and 36673 transitions. [2021-11-07 02:05:06,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 02:05:06,010 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 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 86 [2021-11-07 02:05:06,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:06,054 INFO L225 Difference]: With dead ends: 20284 [2021-11-07 02:05:06,054 INFO L226 Difference]: Without dead ends: 15117 [2021-11-07 02:05:06,064 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 166 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 02:05:06,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15117 states. [2021-11-07 02:05:06,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15117 to 5361. [2021-11-07 02:05:06,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5361 states, 5359 states have (on average 1.7863407352117933) internal successors, (9573), 5360 states have internal predecessors, (9573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:06,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5361 states to 5361 states and 9573 transitions. [2021-11-07 02:05:06,670 INFO L78 Accepts]: Start accepts. Automaton has 5361 states and 9573 transitions. Word has length 86 [2021-11-07 02:05:06,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:06,670 INFO L470 AbstractCegarLoop]: Abstraction has 5361 states and 9573 transitions. [2021-11-07 02:05:06,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 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 02:05:06,672 INFO L276 IsEmpty]: Start isEmpty. Operand 5361 states and 9573 transitions. [2021-11-07 02:05:06,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 02:05:06,683 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:06,683 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:06,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:06,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:06,897 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:06,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:06,897 INFO L85 PathProgramCache]: Analyzing trace with hash 221774042, now seen corresponding path program 1 times [2021-11-07 02:05:06,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:06,898 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1564558603] [2021-11-07 02:05:06,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:06,898 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:06,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:06,900 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:06,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 02:05:07,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:07,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:07,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:08,011 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:05:08,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:08,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:05:08,250 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:08,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1564558603] [2021-11-07 02:05:08,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1564558603] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:08,251 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:05:08,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:05:08,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071183635] [2021-11-07 02:05:08,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:08,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:08,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:08,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:05:08,252 INFO L87 Difference]: Start difference. First operand 5361 states and 9573 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:08,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:08,780 INFO L93 Difference]: Finished difference Result 15504 states and 27733 transitions. [2021-11-07 02:05:08,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:08,780 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 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 86 [2021-11-07 02:05:08,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:08,808 INFO L225 Difference]: With dead ends: 15504 [2021-11-07 02:05:08,808 INFO L226 Difference]: Without dead ends: 10314 [2021-11-07 02:05:08,816 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:05:08,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10314 states. [2021-11-07 02:05:09,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10314 to 10019. [2021-11-07 02:05:09,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10019 states, 10017 states have (on average 1.7879604672057503) internal successors, (17910), 10018 states have internal predecessors, (17910), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:09,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10019 states to 10019 states and 17910 transitions. [2021-11-07 02:05:09,505 INFO L78 Accepts]: Start accepts. Automaton has 10019 states and 17910 transitions. Word has length 86 [2021-11-07 02:05:09,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:09,505 INFO L470 AbstractCegarLoop]: Abstraction has 10019 states and 17910 transitions. [2021-11-07 02:05:09,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:09,506 INFO L276 IsEmpty]: Start isEmpty. Operand 10019 states and 17910 transitions. [2021-11-07 02:05:09,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 02:05:09,522 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:09,523 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] [2021-11-07 02:05:09,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:09,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:09,740 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:09,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:09,741 INFO L85 PathProgramCache]: Analyzing trace with hash -1706055962, now seen corresponding path program 1 times [2021-11-07 02:05:09,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:09,741 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [860184961] [2021-11-07 02:05:09,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:09,742 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:09,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:09,743 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:09,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 02:05:10,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:10,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:05:10,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:10,746 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 02:05:10,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:11,038 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 02:05:11,038 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:11,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [860184961] [2021-11-07 02:05:11,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [860184961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:11,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1443791804] [2021-11-07 02:05:11,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:11,039 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:11,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:11,045 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:11,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 02:05:12,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:12,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:05:12,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:12,385 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 02:05:12,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:12,726 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 02:05:12,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1443791804] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:12,726 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:12,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 02:05:12,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726200307] [2021-11-07 02:05:12,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:05:12,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:12,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:05:12,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:05:12,728 INFO L87 Difference]: Start difference. First operand 10019 states and 17910 transitions. Second operand has 10 states, 10 states have (on average 12.2) internal successors, (122), 10 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:18,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:18,868 INFO L93 Difference]: Finished difference Result 62048 states and 111192 transitions. [2021-11-07 02:05:18,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 02:05:18,869 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 12.2) internal successors, (122), 10 states have internal predecessors, (122), 0 states have call successors, (0), 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 87 [2021-11-07 02:05:18,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:19,051 INFO L225 Difference]: With dead ends: 62048 [2021-11-07 02:05:19,052 INFO L226 Difference]: Without dead ends: 61771 [2021-11-07 02:05:19,067 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 02:05:19,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61771 states. [2021-11-07 02:05:20,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61771 to 19910. [2021-11-07 02:05:20,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19910 states, 19908 states have (on average 1.7884267631103075) internal successors, (35604), 19909 states have internal predecessors, (35604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:20,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19910 states to 19910 states and 35604 transitions. [2021-11-07 02:05:20,956 INFO L78 Accepts]: Start accepts. Automaton has 19910 states and 35604 transitions. Word has length 87 [2021-11-07 02:05:20,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:20,957 INFO L470 AbstractCegarLoop]: Abstraction has 19910 states and 35604 transitions. [2021-11-07 02:05:20,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 12.2) internal successors, (122), 10 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:20,957 INFO L276 IsEmpty]: Start isEmpty. Operand 19910 states and 35604 transitions. [2021-11-07 02:05:21,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 02:05:21,005 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:21,005 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] [2021-11-07 02:05:21,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:21,221 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-11-07 02:05:21,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:21,411 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:21,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:21,411 INFO L85 PathProgramCache]: Analyzing trace with hash -18189841, now seen corresponding path program 1 times [2021-11-07 02:05:21,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:21,412 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [761164234] [2021-11-07 02:05:21,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:21,412 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:21,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:21,413 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:21,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 02:05:22,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:22,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:05:22,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:22,412 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 02:05:22,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:22,694 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 02:05:22,694 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:22,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [761164234] [2021-11-07 02:05:22,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [761164234] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:22,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [762658465] [2021-11-07 02:05:22,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:22,695 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:22,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:22,697 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:22,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 02:05:23,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:23,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:05:23,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:24,084 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 02:05:24,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:24,307 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 02:05:24,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [762658465] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:24,308 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:24,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 02:05:24,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243569578] [2021-11-07 02:05:24,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:05:24,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:24,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:05:24,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:05:24,310 INFO L87 Difference]: Start difference. First operand 19910 states and 35604 transitions. Second operand has 5 states, 5 states have (on average 16.4) internal successors, (82), 5 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:27,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:27,302 INFO L93 Difference]: Finished difference Result 20717 states and 36951 transitions. [2021-11-07 02:05:27,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:05:27,303 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.4) internal successors, (82), 5 states have internal predecessors, (82), 0 states have call successors, (0), 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 88 [2021-11-07 02:05:27,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:27,352 INFO L225 Difference]: With dead ends: 20717 [2021-11-07 02:05:27,352 INFO L226 Difference]: Without dead ends: 20263 [2021-11-07 02:05:27,360 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:05:27,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20263 states. [2021-11-07 02:05:28,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20263 to 19904. [2021-11-07 02:05:28,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19904 states, 19902 states have (on average 1.7883127323887047) internal successors, (35591), 19903 states have internal predecessors, (35591), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:28,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19904 states to 19904 states and 35591 transitions. [2021-11-07 02:05:28,411 INFO L78 Accepts]: Start accepts. Automaton has 19904 states and 35591 transitions. Word has length 88 [2021-11-07 02:05:28,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:28,411 INFO L470 AbstractCegarLoop]: Abstraction has 19904 states and 35591 transitions. [2021-11-07 02:05:28,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.4) internal successors, (82), 5 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:28,412 INFO L276 IsEmpty]: Start isEmpty. Operand 19904 states and 35591 transitions. [2021-11-07 02:05:28,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 02:05:28,438 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:28,438 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] [2021-11-07 02:05:28,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:28,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2021-11-07 02:05:28,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:28,853 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:28,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:28,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1334898663, now seen corresponding path program 1 times [2021-11-07 02:05:28,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:28,854 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2128503515] [2021-11-07 02:05:28,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:28,854 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:28,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:28,855 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:28,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 02:05:29,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:29,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:05:29,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:29,898 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 02:05:29,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:30,099 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 02:05:30,100 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:30,100 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2128503515] [2021-11-07 02:05:30,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2128503515] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:30,100 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:05:30,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 02:05:30,100 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199504371] [2021-11-07 02:05:30,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:05:30,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:30,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:05:30,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:05:30,102 INFO L87 Difference]: Start difference. First operand 19904 states and 35591 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:31,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:31,356 INFO L93 Difference]: Finished difference Result 38964 states and 69893 transitions. [2021-11-07 02:05:31,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:05:31,357 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 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 88 [2021-11-07 02:05:31,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:31,387 INFO L225 Difference]: With dead ends: 38964 [2021-11-07 02:05:31,387 INFO L226 Difference]: Without dead ends: 19307 [2021-11-07 02:05:31,412 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:05:31,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19307 states. [2021-11-07 02:05:32,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19307 to 10017. [2021-11-07 02:05:32,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10017 states, 10015 states have (on average 1.7874188716924613) internal successors, (17901), 10016 states have internal predecessors, (17901), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:32,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10017 states to 10017 states and 17901 transitions. [2021-11-07 02:05:32,248 INFO L78 Accepts]: Start accepts. Automaton has 10017 states and 17901 transitions. Word has length 88 [2021-11-07 02:05:32,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:32,249 INFO L470 AbstractCegarLoop]: Abstraction has 10017 states and 17901 transitions. [2021-11-07 02:05:32,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:32,249 INFO L276 IsEmpty]: Start isEmpty. Operand 10017 states and 17901 transitions. [2021-11-07 02:05:32,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-07 02:05:32,263 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:32,263 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] [2021-11-07 02:05:32,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:32,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:32,477 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:32,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:32,477 INFO L85 PathProgramCache]: Analyzing trace with hash -314840291, now seen corresponding path program 1 times [2021-11-07 02:05:32,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:32,477 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [784753806] [2021-11-07 02:05:32,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:32,478 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:32,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:32,478 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:32,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 02:05:33,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:33,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 570 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:05:33,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:33,569 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 02:05:33,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:33,850 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 02:05:33,850 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:33,850 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [784753806] [2021-11-07 02:05:33,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [784753806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:33,850 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [795855583] [2021-11-07 02:05:33,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:33,850 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:33,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:33,853 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:33,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 02:05:35,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:35,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 570 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:05:35,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:35,704 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 02:05:35,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:36,147 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 02:05:36,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [795855583] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:36,148 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:36,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 02:05:36,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93568871] [2021-11-07 02:05:36,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:05:36,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:36,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:05:36,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:05:36,150 INFO L87 Difference]: Start difference. First operand 10017 states and 17901 transitions. Second operand has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:55,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:55,836 INFO L93 Difference]: Finished difference Result 23308 states and 41097 transitions. [2021-11-07 02:05:55,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 02:05:55,837 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 0 states have call successors, (0), 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 90 [2021-11-07 02:05:55,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:55,867 INFO L225 Difference]: With dead ends: 23308 [2021-11-07 02:05:55,867 INFO L226 Difference]: Without dead ends: 23042 [2021-11-07 02:05:55,872 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 02:05:55,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23042 states. [2021-11-07 02:05:57,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23042 to 19890. [2021-11-07 02:05:57,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19890 states, 19888 states have (on average 1.788515687851971) internal successors, (35570), 19889 states have internal predecessors, (35570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:57,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19890 states to 19890 states and 35570 transitions. [2021-11-07 02:05:57,058 INFO L78 Accepts]: Start accepts. Automaton has 19890 states and 35570 transitions. Word has length 90 [2021-11-07 02:05:57,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:57,058 INFO L470 AbstractCegarLoop]: Abstraction has 19890 states and 35570 transitions. [2021-11-07 02:05:57,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:57,058 INFO L276 IsEmpty]: Start isEmpty. Operand 19890 states and 35570 transitions. [2021-11-07 02:05:57,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-07 02:05:57,078 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:57,078 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] [2021-11-07 02:05:57,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:57,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:57,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:57,479 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:57,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:57,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1756837736, now seen corresponding path program 1 times [2021-11-07 02:05:57,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:57,480 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [937007524] [2021-11-07 02:05:57,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:57,480 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:57,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:57,481 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:57,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 02:05:58,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:58,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:05:58,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:58,704 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 02:05:58,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:58,951 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 02:05:58,951 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:58,951 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [937007524] [2021-11-07 02:05:58,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [937007524] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:58,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2073792541] [2021-11-07 02:05:58,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:58,952 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:58,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:58,953 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:58,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 02:06:00,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:00,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:06:00,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:00,570 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 02:06:00,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:00,861 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 02:06:00,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2073792541] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:06:00,862 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:06:00,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 02:06:00,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623120107] [2021-11-07 02:06:00,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 02:06:00,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:06:00,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 02:06:00,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:06:00,863 INFO L87 Difference]: Start difference. First operand 19890 states and 35570 transitions. Second operand has 7 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:04,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:06:04,313 INFO L93 Difference]: Finished difference Result 20698 states and 36897 transitions. [2021-11-07 02:06:04,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:06:04,314 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 0 states have call successors, (0), 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 91 [2021-11-07 02:06:04,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:06:04,346 INFO L225 Difference]: With dead ends: 20698 [2021-11-07 02:06:04,346 INFO L226 Difference]: Without dead ends: 20152 [2021-11-07 02:06:04,352 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-07 02:06:04,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20152 states. [2021-11-07 02:06:05,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20152 to 19872. [2021-11-07 02:06:05,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19872 states, 19870 states have (on average 1.7881227981882235) internal successors, (35530), 19871 states have internal predecessors, (35530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:05,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19872 states to 19872 states and 35530 transitions. [2021-11-07 02:06:05,695 INFO L78 Accepts]: Start accepts. Automaton has 19872 states and 35530 transitions. Word has length 91 [2021-11-07 02:06:05,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:06:05,695 INFO L470 AbstractCegarLoop]: Abstraction has 19872 states and 35530 transitions. [2021-11-07 02:06:05,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:05,696 INFO L276 IsEmpty]: Start isEmpty. Operand 19872 states and 35530 transitions. [2021-11-07 02:06:05,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-07 02:06:05,710 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:06:05,710 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] [2021-11-07 02:06:05,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:05,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:06,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:06,128 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:06:06,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:06:06,129 INFO L85 PathProgramCache]: Analyzing trace with hash 595867712, now seen corresponding path program 1 times [2021-11-07 02:06:06,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:06:06,129 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [201284016] [2021-11-07 02:06:06,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:06,129 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:06:06,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:06:06,131 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:06:06,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 02:06:07,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:07,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:06:07,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:07,406 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 02:06:07,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:07,671 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 02:06:07,671 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:06:07,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [201284016] [2021-11-07 02:06:07,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [201284016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:06:07,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [133295172] [2021-11-07 02:06:07,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:07,672 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:07,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:06:07,685 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:06:07,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 02:06:09,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:09,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:06:09,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:09,771 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 02:06:09,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:10,175 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 02:06:10,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [133295172] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:06:10,175 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:06:10,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 02:06:10,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869586498] [2021-11-07 02:06:10,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:06:10,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:06:10,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:06:10,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:06:10,177 INFO L87 Difference]: Start difference. First operand 19872 states and 35530 transitions. Second operand has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:32,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:06:32,802 INFO L93 Difference]: Finished difference Result 44456 states and 78610 transitions. [2021-11-07 02:06:32,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 02:06:32,803 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 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 91 [2021-11-07 02:06:32,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:06:32,863 INFO L225 Difference]: With dead ends: 44456 [2021-11-07 02:06:32,863 INFO L226 Difference]: Without dead ends: 44030 [2021-11-07 02:06:32,873 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 02:06:32,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44030 states. [2021-11-07 02:06:35,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44030 to 39513. [2021-11-07 02:06:35,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39513 states, 39511 states have (on average 1.7886664473184684) internal successors, (70672), 39512 states have internal predecessors, (70672), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:35,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39513 states to 39513 states and 70672 transitions. [2021-11-07 02:06:35,264 INFO L78 Accepts]: Start accepts. Automaton has 39513 states and 70672 transitions. Word has length 91 [2021-11-07 02:06:35,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:06:35,264 INFO L470 AbstractCegarLoop]: Abstraction has 39513 states and 70672 transitions. [2021-11-07 02:06:35,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:35,264 INFO L276 IsEmpty]: Start isEmpty. Operand 39513 states and 70672 transitions. [2021-11-07 02:06:35,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-07 02:06:35,290 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:06:35,291 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] [2021-11-07 02:06:35,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:35,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:35,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:06:35,699 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:06:35,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:06:35,699 INFO L85 PathProgramCache]: Analyzing trace with hash 618499966, now seen corresponding path program 1 times [2021-11-07 02:06:35,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:06:35,699 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1637586648] [2021-11-07 02:06:35,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:35,700 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:06:35,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:06:35,701 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:06:35,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 02:06:37,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:37,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:06:37,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:37,268 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 02:06:37,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:37,528 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 02:06:37,529 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:06:37,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1637586648] [2021-11-07 02:06:37,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1637586648] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:06:37,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1173025169] [2021-11-07 02:06:37,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:37,530 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:37,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:06:37,531 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:06:37,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 02:06:39,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:39,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 02:06:39,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:39,441 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 02:06:39,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:39,800 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 02:06:39,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1173025169] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:06:39,800 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:06:39,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 20 [2021-11-07 02:06:39,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217611296] [2021-11-07 02:06:39,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-07 02:06:39,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:06:39,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-07 02:06:39,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-11-07 02:06:39,802 INFO L87 Difference]: Start difference. First operand 39513 states and 70672 transitions. Second operand has 14 states, 14 states have (on average 10.214285714285714) internal successors, (143), 14 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:49,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:06:49,718 INFO L93 Difference]: Finished difference Result 50191 states and 88116 transitions. [2021-11-07 02:06:49,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-07 02:06:49,719 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 10.214285714285714) internal successors, (143), 14 states have internal predecessors, (143), 0 states have call successors, (0), 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 91 [2021-11-07 02:06:49,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:06:49,798 INFO L225 Difference]: With dead ends: 50191 [2021-11-07 02:06:49,798 INFO L226 Difference]: Without dead ends: 49281 [2021-11-07 02:06:49,809 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=826, Invalid=2596, Unknown=0, NotChecked=0, Total=3422 [2021-11-07 02:06:49,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49281 states. [2021-11-07 02:06:52,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49281 to 40000. [2021-11-07 02:06:52,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40000 states, 39998 states have (on average 1.7857892894644731) internal successors, (71428), 39999 states have internal predecessors, (71428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:52,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40000 states to 40000 states and 71428 transitions. [2021-11-07 02:06:52,565 INFO L78 Accepts]: Start accepts. Automaton has 40000 states and 71428 transitions. Word has length 91 [2021-11-07 02:06:52,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:06:52,565 INFO L470 AbstractCegarLoop]: Abstraction has 40000 states and 71428 transitions. [2021-11-07 02:06:52,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 10.214285714285714) internal successors, (143), 14 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:52,566 INFO L276 IsEmpty]: Start isEmpty. Operand 40000 states and 71428 transitions. [2021-11-07 02:06:52,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-07 02:06:52,607 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:06:52,607 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] [2021-11-07 02:06:52,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:52,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:53,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:06:53,008 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:06:53,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:06:53,009 INFO L85 PathProgramCache]: Analyzing trace with hash 275847197, now seen corresponding path program 1 times [2021-11-07 02:06:53,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:06:53,009 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [993747944] [2021-11-07 02:06:53,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:53,010 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:06:53,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:06:53,011 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:06:53,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 02:06:54,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:54,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 572 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:06:54,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:54,537 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 02:06:54,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:54,807 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 02:06:54,807 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:06:54,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [993747944] [2021-11-07 02:06:54,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [993747944] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:06:54,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [477028552] [2021-11-07 02:06:54,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:54,807 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:54,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:06:54,808 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:06:54,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 02:06:56,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:56,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 572 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:06:56,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:56,802 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 02:06:56,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:57,124 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 02:06:57,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [477028552] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:06:57,125 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:06:57,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 02:06:57,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410321312] [2021-11-07 02:06:57,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:06:57,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:06:57,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:06:57,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:06:57,127 INFO L87 Difference]: Start difference. First operand 40000 states and 71428 transitions. Second operand has 5 states, 5 states have (on average 17.2) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:07:01,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:01,230 INFO L93 Difference]: Finished difference Result 48136 states and 84642 transitions. [2021-11-07 02:07:01,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 02:07:01,231 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 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 92 [2021-11-07 02:07:01,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:01,302 INFO L225 Difference]: With dead ends: 48136 [2021-11-07 02:07:01,302 INFO L226 Difference]: Without dead ends: 47001 [2021-11-07 02:07:01,311 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 355 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 02:07:01,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47001 states. [2021-11-07 02:07:04,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47001 to 41480. [2021-11-07 02:07:04,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41480 states, 41478 states have (on average 1.779401128308983) internal successors, (73806), 41479 states have internal predecessors, (73806), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:07:04,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41480 states to 41480 states and 73806 transitions. [2021-11-07 02:07:04,598 INFO L78 Accepts]: Start accepts. Automaton has 41480 states and 73806 transitions. Word has length 92 [2021-11-07 02:07:04,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:04,598 INFO L470 AbstractCegarLoop]: Abstraction has 41480 states and 73806 transitions. [2021-11-07 02:07:04,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:07:04,598 INFO L276 IsEmpty]: Start isEmpty. Operand 41480 states and 73806 transitions. [2021-11-07 02:07:04,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-07 02:07:04,646 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:04,646 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] [2021-11-07 02:07:04,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:04,872 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:05,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:05,067 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:05,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:05,067 INFO L85 PathProgramCache]: Analyzing trace with hash -788170209, now seen corresponding path program 1 times [2021-11-07 02:07:05,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:05,068 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [327153254] [2021-11-07 02:07:05,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:05,068 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:05,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:05,070 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:05,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 02:07:06,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:06,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:07:06,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:06,589 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 02:07:06,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:06,828 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 02:07:06,829 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:06,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [327153254] [2021-11-07 02:07:06,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [327153254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:06,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [24183721] [2021-11-07 02:07:06,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:06,829 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:06,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:06,830 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:06,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0bbf94c8-1acc-44b7-bbfb-9d4b5b0cbdb2/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 02:07:08,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:08,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-07 02:07:08,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:08,943 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 02:07:08,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:09,157 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 02:07:09,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [24183721] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:07:09,157 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:07:09,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [5, 5] total 16 [2021-11-07 02:07:09,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143016000] [2021-11-07 02:07:09,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:07:09,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:09,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:07:09,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:07:09,159 INFO L87 Difference]: Start difference. First operand 41480 states and 73806 transitions. Second operand has 10 states, 10 states have (on average 8.7) internal successors, (87), 10 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)