./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec9_product28.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/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_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec9_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/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_4b380c87-eee5-412a-830f-94c8768df364/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 6fc432013ed2168eea9a323e37470d64fe5b972a8b4d9d4e2e5fdd67cd32ffed --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:57:51,690 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:57:51,694 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:57:51,755 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:57:51,757 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:57:51,763 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:57:51,766 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:57:51,771 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:57:51,774 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:57:51,781 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:57:51,782 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:57:51,784 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:57:51,785 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:57:51,793 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:57:51,795 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:57:51,797 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:57:51,800 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:57:51,802 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:57:51,809 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:57:51,815 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:57:51,820 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:57:51,822 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:57:51,826 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:57:51,827 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:57:51,831 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:57:51,832 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:57:51,832 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:57:51,834 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:57:51,834 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:57:51,836 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:57:51,836 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:57:51,838 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:57:51,839 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:57:51,840 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:57:51,841 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:57:51,842 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:57:51,843 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:57:51,843 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:57:51,843 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:57:51,844 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:57:51,845 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:57:51,846 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:57:51,880 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:57:51,880 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:57:51,881 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:57:51,881 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:57:51,882 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:57:51,882 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:57:51,882 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:57:51,882 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:57:51,883 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:57:51,883 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:57:51,883 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:57:51,883 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:57:51,884 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:57:51,884 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:57:51,884 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:57:51,885 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:57:51,885 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:57:51,886 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:57:51,886 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:57:51,886 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:57:51,886 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:57:51,887 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:57:51,887 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:57:51,887 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:57:51,887 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:57:51,888 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:57:51,888 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:57:51,888 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:57:51,888 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:57:51,889 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:57:51,889 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:57:51,889 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:57:51,890 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:57:51,890 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:57:51,890 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:57:51,890 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:57:51,891 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:57:51,891 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:57:51,891 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:57:51,891 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_4b380c87-eee5-412a-830f-94c8768df364/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6fc432013ed2168eea9a323e37470d64fe5b972a8b4d9d4e2e5fdd67cd32ffed [2021-11-07 00:57:52,207 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:57:52,257 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:57:52,260 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:57:52,261 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:57:52,262 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:57:52,263 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec9_product28.cil.c [2021-11-07 00:57:52,360 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data/551309ca8/5642341df0ad4a6db3663de6ea0edb75/FLAG051164a99 [2021-11-07 00:57:53,078 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:57:53,079 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/sv-benchmarks/c/product-lines/email_spec9_product28.cil.c [2021-11-07 00:57:53,105 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data/551309ca8/5642341df0ad4a6db3663de6ea0edb75/FLAG051164a99 [2021-11-07 00:57:53,262 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data/551309ca8/5642341df0ad4a6db3663de6ea0edb75 [2021-11-07 00:57:53,265 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:57:53,267 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:57:53,269 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:57:53,269 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:57:53,275 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:57:53,276 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:57:53" (1/1) ... [2021-11-07 00:57:53,277 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44102607 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:53, skipping insertion in model container [2021-11-07 00:57:53,277 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:57:53" (1/1) ... [2021-11-07 00:57:53,290 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:57:53,395 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:57:54,203 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_4b380c87-eee5-412a-830f-94c8768df364/sv-benchmarks/c/product-lines/email_spec9_product28.cil.c[63802,63815] [2021-11-07 00:57:54,206 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:57:54,236 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 00:57:54,237 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@7c3cd03f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:54, skipping insertion in model container [2021-11-07 00:57:54,237 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:57:54,238 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 00:57:54,242 INFO L168 Benchmark]: Toolchain (without parser) took 973.16 ms. Allocated memory was 92.3 MB in the beginning and 127.9 MB in the end (delta: 35.7 MB). Free memory was 54.2 MB in the beginning and 88.7 MB in the end (delta: -34.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-07 00:57:54,244 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 92.3 MB. Free memory was 64.1 MB in the beginning and 64.1 MB in the end (delta: 29.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 00:57:54,246 INFO L168 Benchmark]: CACSL2BoogieTranslator took 969.13 ms. Allocated memory was 92.3 MB in the beginning and 127.9 MB in the end (delta: 35.7 MB). Free memory was 54.0 MB in the beginning and 88.7 MB in the end (delta: -34.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-07 00:57:54,250 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 92.3 MB. Free memory was 64.1 MB in the beginning and 64.1 MB in the end (delta: 29.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 969.13 ms. Allocated memory was 92.3 MB in the beginning and 127.9 MB in the end (delta: 35.7 MB). Free memory was 54.0 MB in the beginning and 88.7 MB in the end (delta: -34.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 1830]: 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_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/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_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec9_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/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_4b380c87-eee5-412a-830f-94c8768df364/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 6fc432013ed2168eea9a323e37470d64fe5b972a8b4d9d4e2e5fdd67cd32ffed --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:57:57,128 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:57:57,130 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:57:57,171 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:57:57,171 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:57:57,173 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:57:57,175 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:57:57,178 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:57:57,181 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:57:57,183 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:57:57,184 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:57:57,186 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:57:57,187 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:57:57,189 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:57:57,191 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:57:57,193 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:57:57,194 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:57:57,196 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:57:57,199 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:57:57,202 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:57:57,204 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:57:57,206 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:57:57,208 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:57:57,209 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:57:57,214 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:57:57,215 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:57:57,215 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:57:57,217 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:57:57,217 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:57:57,219 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:57:57,220 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:57:57,221 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:57:57,222 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:57:57,223 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:57:57,225 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:57:57,225 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:57:57,227 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:57:57,227 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:57:57,228 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:57:57,229 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:57:57,230 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:57:57,231 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 00:57:57,284 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:57:57,287 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:57:57,289 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:57:57,289 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:57:57,290 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:57:57,290 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:57:57,296 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:57:57,297 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:57:57,298 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:57:57,300 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:57:57,301 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:57:57,302 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:57:57,302 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:57:57,302 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:57:57,303 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:57:57,303 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:57:57,303 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:57:57,304 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 00:57:57,304 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 00:57:57,304 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:57:57,304 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:57:57,305 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:57:57,305 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:57:57,305 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:57:57,306 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 00:57:57,306 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:57:57,306 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:57:57,307 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:57:57,307 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:57:57,307 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:57:57,307 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 00:57:57,308 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:57,308 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:57:57,308 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:57:57,309 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:57:57,309 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_4b380c87-eee5-412a-830f-94c8768df364/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6fc432013ed2168eea9a323e37470d64fe5b972a8b4d9d4e2e5fdd67cd32ffed [2021-11-07 00:57:57,865 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:57:57,892 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:57:57,896 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:57:57,898 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:57:57,899 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:57:57,901 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec9_product28.cil.c [2021-11-07 00:57:57,998 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data/77767a773/b41aa307d50f411f9b658b4f7769801a/FLAG14c842b09 [2021-11-07 00:57:58,895 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:57:58,896 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/sv-benchmarks/c/product-lines/email_spec9_product28.cil.c [2021-11-07 00:57:58,939 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data/77767a773/b41aa307d50f411f9b658b4f7769801a/FLAG14c842b09 [2021-11-07 00:57:58,995 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/data/77767a773/b41aa307d50f411f9b658b4f7769801a [2021-11-07 00:57:59,001 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:57:59,005 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:57:59,008 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:57:59,009 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:57:59,013 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:57:59,014 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:57:58" (1/1) ... [2021-11-07 00:57:59,016 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c260846 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:57:59, skipping insertion in model container [2021-11-07 00:57:59,016 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:57:58" (1/1) ... [2021-11-07 00:57:59,025 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:57:59,133 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:58:00,082 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_4b380c87-eee5-412a-830f-94c8768df364/sv-benchmarks/c/product-lines/email_spec9_product28.cil.c[63802,63815] [2021-11-07 00:58:00,087 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:00,117 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 00:58:00,142 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:58:00,330 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_4b380c87-eee5-412a-830f-94c8768df364/sv-benchmarks/c/product-lines/email_spec9_product28.cil.c[63802,63815] [2021-11-07 00:58:00,331 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:00,342 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:58:00,488 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_4b380c87-eee5-412a-830f-94c8768df364/sv-benchmarks/c/product-lines/email_spec9_product28.cil.c[63802,63815] [2021-11-07 00:58:00,489 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:00,554 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:58:00,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00 WrapperNode [2021-11-07 00:58:00,554 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:58:00,556 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:58:00,556 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:58:00,557 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:58:00,566 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,645 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,795 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:58:00,796 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:58:00,796 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:58:00,796 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:58:00,807 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,808 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,815 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,816 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,857 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,884 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,891 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:58:00,908 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:58:00,908 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:58:00,908 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:58:00,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (1/1) ... [2021-11-07 00:58:00,918 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:58:00,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:58:00,968 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:58:00,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:58:01,037 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 00:58:01,037 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:58:01,038 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 00:58:01,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:58:01,038 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:58:06,152 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:58:06,152 INFO L299 CfgBuilder]: Removed 295 assume(true) statements. [2021-11-07 00:58:06,156 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:58:06 BoogieIcfgContainer [2021-11-07 00:58:06,156 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:58:06,159 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:58:06,159 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:58:06,162 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:58:06,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:57:58" (1/3) ... [2021-11-07 00:58:06,164 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fc939 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:58:06, skipping insertion in model container [2021-11-07 00:58:06,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:00" (2/3) ... [2021-11-07 00:58:06,165 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fc939 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:58:06, skipping insertion in model container [2021-11-07 00:58:06,165 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:58:06" (3/3) ... [2021-11-07 00:58:06,166 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec9_product28.cil.c [2021-11-07 00:58:06,173 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:58:06,174 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 00:58:06,254 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:58:06,266 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 00:58:06,266 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 00:58:06,309 INFO L276 IsEmpty]: Start isEmpty. Operand has 477 states, 474 states have (on average 1.761603375527426) internal successors, (835), 476 states have internal predecessors, (835), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:06,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 00:58:06,336 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:06,337 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:06,338 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:06,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:06,345 INFO L85 PathProgramCache]: Analyzing trace with hash 688116892, now seen corresponding path program 1 times [2021-11-07 00:58:06,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:06,363 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [29147688] [2021-11-07 00:58:06,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:06,365 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:06,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:06,369 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:06,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 00:58:06,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:06,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 00:58:06,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:07,194 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:07,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:07,419 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:07,420 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:07,420 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [29147688] [2021-11-07 00:58:07,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [29147688] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:07,421 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:07,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 00:58:07,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271738271] [2021-11-07 00:58:07,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 00:58:07,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:07,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 00:58:07,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:58:07,449 INFO L87 Difference]: Start difference. First operand has 477 states, 474 states have (on average 1.761603375527426) internal successors, (835), 476 states have internal predecessors, (835), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:07,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:07,564 INFO L93 Difference]: Finished difference Result 716 states and 1236 transitions. [2021-11-07 00:58:07,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 00:58:07,565 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 00:58:07,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:07,589 INFO L225 Difference]: With dead ends: 716 [2021-11-07 00:58:07,590 INFO L226 Difference]: Without dead ends: 407 [2021-11-07 00:58:07,596 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:58:07,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2021-11-07 00:58:07,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 407. [2021-11-07 00:58:07,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 405 states have (on average 1.7580246913580246) internal successors, (712), 406 states have internal predecessors, (712), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:07,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 712 transitions. [2021-11-07 00:58:07,729 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 712 transitions. Word has length 45 [2021-11-07 00:58:07,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:07,730 INFO L470 AbstractCegarLoop]: Abstraction has 407 states and 712 transitions. [2021-11-07 00:58:07,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:07,730 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 712 transitions. [2021-11-07 00:58:07,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 00:58:07,744 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:07,744 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] [2021-11-07 00:58:07,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:07,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:07,963 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:07,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:07,969 INFO L85 PathProgramCache]: Analyzing trace with hash 549277264, now seen corresponding path program 1 times [2021-11-07 00:58:07,970 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:07,970 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1316373888] [2021-11-07 00:58:07,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:07,971 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:07,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:07,978 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:07,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 00:58:08,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:08,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:58:08,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:08,651 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:08,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:08,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:08,835 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:08,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1316373888] [2021-11-07 00:58:08,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1316373888] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:08,837 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:08,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:58:08,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368891828] [2021-11-07 00:58:08,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:08,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:08,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:08,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:08,848 INFO L87 Difference]: Start difference. First operand 407 states and 712 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:09,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:09,045 INFO L93 Difference]: Finished difference Result 1191 states and 2088 transitions. [2021-11-07 00:58:09,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:09,046 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 00:58:09,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:09,056 INFO L225 Difference]: With dead ends: 1191 [2021-11-07 00:58:09,057 INFO L226 Difference]: Without dead ends: 799 [2021-11-07 00:58:09,061 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:09,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-11-07 00:58:09,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 406. [2021-11-07 00:58:09,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 404 states have (on average 1.75) internal successors, (707), 405 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:09,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 707 transitions. [2021-11-07 00:58:09,123 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 707 transitions. Word has length 46 [2021-11-07 00:58:09,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:09,125 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 707 transitions. [2021-11-07 00:58:09,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:09,126 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 707 transitions. [2021-11-07 00:58:09,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 00:58:09,137 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:09,137 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:09,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:09,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:09,355 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:09,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:09,356 INFO L85 PathProgramCache]: Analyzing trace with hash 256234666, now seen corresponding path program 1 times [2021-11-07 00:58:09,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:09,358 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1313739550] [2021-11-07 00:58:09,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:09,358 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:09,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:09,360 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:09,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 00:58:09,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:09,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:58:09,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:10,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:10,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:10,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:10,270 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:10,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1313739550] [2021-11-07 00:58:10,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1313739550] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:10,271 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:10,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:58:10,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659468869] [2021-11-07 00:58:10,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:58:10,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:10,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:58:10,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:58:10,277 INFO L87 Difference]: Start difference. First operand 406 states and 707 transitions. Second operand has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:10,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:10,582 INFO L93 Difference]: Finished difference Result 1541 states and 2690 transitions. [2021-11-07 00:58:10,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:58:10,583 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 00:58:10,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:10,594 INFO L225 Difference]: With dead ends: 1541 [2021-11-07 00:58:10,594 INFO L226 Difference]: Without dead ends: 1153 [2021-11-07 00:58:10,600 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:58:10,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1153 states. [2021-11-07 00:58:10,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1153 to 405. [2021-11-07 00:58:10,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 403 states have (on average 1.7444168734491314) internal successors, (703), 404 states have internal predecessors, (703), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:10,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 703 transitions. [2021-11-07 00:58:10,647 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 703 transitions. Word has length 48 [2021-11-07 00:58:10,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:10,648 INFO L470 AbstractCegarLoop]: Abstraction has 405 states and 703 transitions. [2021-11-07 00:58:10,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:10,649 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 703 transitions. [2021-11-07 00:58:10,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 00:58:10,652 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:10,652 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:10,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:10,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:10,871 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:10,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:10,871 INFO L85 PathProgramCache]: Analyzing trace with hash 2045903351, now seen corresponding path program 1 times [2021-11-07 00:58:10,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:10,873 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [91274372] [2021-11-07 00:58:10,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:10,873 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:10,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:10,875 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:10,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 00:58:11,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:11,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:58:11,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:11,565 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:11,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:11,722 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:11,722 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:11,723 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [91274372] [2021-11-07 00:58:11,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [91274372] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:11,724 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:11,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:58:11,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753344034] [2021-11-07 00:58:11,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:11,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:11,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:11,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:11,728 INFO L87 Difference]: Start difference. First operand 405 states and 703 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:11,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:11,811 INFO L93 Difference]: Finished difference Result 807 states and 1403 transitions. [2021-11-07 00:58:11,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:11,811 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 00:58:11,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:11,815 INFO L225 Difference]: With dead ends: 807 [2021-11-07 00:58:11,816 INFO L226 Difference]: Without dead ends: 410 [2021-11-07 00:58:11,817 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:11,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2021-11-07 00:58:11,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 405. [2021-11-07 00:58:11,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 403 states have (on average 1.7369727047146402) internal successors, (700), 404 states have internal predecessors, (700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:11,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 700 transitions. [2021-11-07 00:58:11,856 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 700 transitions. Word has length 49 [2021-11-07 00:58:11,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:11,857 INFO L470 AbstractCegarLoop]: Abstraction has 405 states and 700 transitions. [2021-11-07 00:58:11,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:11,858 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 700 transitions. [2021-11-07 00:58:11,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 00:58:11,861 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:11,861 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:11,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:12,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:12,079 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:12,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:12,080 INFO L85 PathProgramCache]: Analyzing trace with hash -448494910, now seen corresponding path program 1 times [2021-11-07 00:58:12,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:12,081 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [283308134] [2021-11-07 00:58:12,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:12,081 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:12,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:12,083 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:12,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 00:58:12,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:12,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:58:12,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:12,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:12,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:13,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:13,004 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:13,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [283308134] [2021-11-07 00:58:13,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [283308134] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:13,004 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:13,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:58:13,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200229673] [2021-11-07 00:58:13,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:58:13,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:13,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:58:13,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:58:13,007 INFO L87 Difference]: Start difference. First operand 405 states and 700 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:13,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:13,292 INFO L93 Difference]: Finished difference Result 1528 states and 2666 transitions. [2021-11-07 00:58:13,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:58:13,293 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-07 00:58:13,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:13,302 INFO L225 Difference]: With dead ends: 1528 [2021-11-07 00:58:13,302 INFO L226 Difference]: Without dead ends: 1149 [2021-11-07 00:58:13,303 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:58:13,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1149 states. [2021-11-07 00:58:13,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1149 to 405. [2021-11-07 00:58:13,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 403 states have (on average 1.7295285359801489) internal successors, (697), 404 states have internal predecessors, (697), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:13,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 697 transitions. [2021-11-07 00:58:13,347 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 697 transitions. Word has length 50 [2021-11-07 00:58:13,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:13,347 INFO L470 AbstractCegarLoop]: Abstraction has 405 states and 697 transitions. [2021-11-07 00:58:13,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:13,348 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 697 transitions. [2021-11-07 00:58:13,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 00:58:13,350 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:13,350 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:13,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:13,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:13,567 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:13,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:13,568 INFO L85 PathProgramCache]: Analyzing trace with hash 1996786599, now seen corresponding path program 1 times [2021-11-07 00:58:13,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:13,569 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2065259460] [2021-11-07 00:58:13,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:13,569 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:13,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:13,571 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:13,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 00:58:14,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:14,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:14,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:14,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:14,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:14,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:14,401 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:14,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2065259460] [2021-11-07 00:58:14,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2065259460] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:14,402 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:14,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:58:14,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094365562] [2021-11-07 00:58:14,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:14,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:14,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:14,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:14,404 INFO L87 Difference]: Start difference. First operand 405 states and 697 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:14,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:14,506 INFO L93 Difference]: Finished difference Result 953 states and 1645 transitions. [2021-11-07 00:58:14,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:14,506 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 00:58:14,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:14,513 INFO L225 Difference]: With dead ends: 953 [2021-11-07 00:58:14,513 INFO L226 Difference]: Without dead ends: 784 [2021-11-07 00:58:14,514 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:14,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 784 states. [2021-11-07 00:58:14,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 784 to 615. [2021-11-07 00:58:14,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 615 states, 613 states have (on average 1.7634584013050572) internal successors, (1081), 614 states have internal predecessors, (1081), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:14,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 615 states to 615 states and 1081 transitions. [2021-11-07 00:58:14,576 INFO L78 Accepts]: Start accepts. Automaton has 615 states and 1081 transitions. Word has length 52 [2021-11-07 00:58:14,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:14,577 INFO L470 AbstractCegarLoop]: Abstraction has 615 states and 1081 transitions. [2021-11-07 00:58:14,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:14,578 INFO L276 IsEmpty]: Start isEmpty. Operand 615 states and 1081 transitions. [2021-11-07 00:58:14,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 00:58:14,580 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:14,580 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:14,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:14,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:14,798 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:14,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:14,799 INFO L85 PathProgramCache]: Analyzing trace with hash 164223446, now seen corresponding path program 1 times [2021-11-07 00:58:14,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:14,800 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [946822597] [2021-11-07 00:58:14,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:14,800 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:14,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:14,802 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:14,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 00:58:15,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:15,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:15,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:15,579 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:15,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:15,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:15,785 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:15,786 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [946822597] [2021-11-07 00:58:15,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [946822597] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:15,786 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:15,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:58:15,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373132344] [2021-11-07 00:58:15,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:15,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:15,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:15,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:15,790 INFO L87 Difference]: Start difference. First operand 615 states and 1081 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:15,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:15,887 INFO L93 Difference]: Finished difference Result 1473 states and 2598 transitions. [2021-11-07 00:58:15,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:15,887 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 00:58:15,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:15,895 INFO L225 Difference]: With dead ends: 1473 [2021-11-07 00:58:15,896 INFO L226 Difference]: Without dead ends: 942 [2021-11-07 00:58:15,898 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:15,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 942 states. [2021-11-07 00:58:15,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 942 to 773. [2021-11-07 00:58:15,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 773 states, 771 states have (on average 1.7743190661478598) internal successors, (1368), 772 states have internal predecessors, (1368), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:15,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 773 states to 773 states and 1368 transitions. [2021-11-07 00:58:15,989 INFO L78 Accepts]: Start accepts. Automaton has 773 states and 1368 transitions. Word has length 64 [2021-11-07 00:58:15,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:15,992 INFO L470 AbstractCegarLoop]: Abstraction has 773 states and 1368 transitions. [2021-11-07 00:58:15,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:15,993 INFO L276 IsEmpty]: Start isEmpty. Operand 773 states and 1368 transitions. [2021-11-07 00:58:15,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 00:58:15,996 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:15,996 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:16,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:16,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:16,215 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:16,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:16,215 INFO L85 PathProgramCache]: Analyzing trace with hash 566835671, now seen corresponding path program 1 times [2021-11-07 00:58:16,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:16,216 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [417007969] [2021-11-07 00:58:16,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:16,217 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:16,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:16,218 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:16,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 00:58:16,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:16,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:16,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:17,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:17,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:17,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:17,214 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:17,214 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [417007969] [2021-11-07 00:58:17,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [417007969] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:17,215 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:17,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:58:17,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697773698] [2021-11-07 00:58:17,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:17,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:17,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:17,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:17,217 INFO L87 Difference]: Start difference. First operand 773 states and 1368 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:17,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:17,372 INFO L93 Difference]: Finished difference Result 1991 states and 3545 transitions. [2021-11-07 00:58:17,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:17,373 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-07 00:58:17,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:17,384 INFO L225 Difference]: With dead ends: 1991 [2021-11-07 00:58:17,384 INFO L226 Difference]: Without dead ends: 1306 [2021-11-07 00:58:17,387 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:17,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1306 states. [2021-11-07 00:58:17,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1306 to 1137. [2021-11-07 00:58:17,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1137 states, 1135 states have (on average 1.790308370044053) internal successors, (2032), 1136 states have internal predecessors, (2032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:17,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1137 states to 1137 states and 2032 transitions. [2021-11-07 00:58:17,513 INFO L78 Accepts]: Start accepts. Automaton has 1137 states and 2032 transitions. Word has length 65 [2021-11-07 00:58:17,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:17,514 INFO L470 AbstractCegarLoop]: Abstraction has 1137 states and 2032 transitions. [2021-11-07 00:58:17,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:17,515 INFO L276 IsEmpty]: Start isEmpty. Operand 1137 states and 2032 transitions. [2021-11-07 00:58:17,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:58:17,518 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:17,518 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:17,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:17,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:17,737 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:17,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:17,738 INFO L85 PathProgramCache]: Analyzing trace with hash 283001415, now seen corresponding path program 1 times [2021-11-07 00:58:17,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:17,739 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1719064958] [2021-11-07 00:58:17,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:17,739 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:17,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:17,740 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:17,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 00:58:18,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:18,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:18,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:18,619 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:18,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:18,825 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:18,825 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:18,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1719064958] [2021-11-07 00:58:18,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1719064958] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:18,826 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:18,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:58:18,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100420940] [2021-11-07 00:58:18,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:18,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:18,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:18,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:18,828 INFO L87 Difference]: Start difference. First operand 1137 states and 2032 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:18,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:18,974 INFO L93 Difference]: Finished difference Result 2201 states and 3926 transitions. [2021-11-07 00:58:18,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:18,975 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:58:18,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:18,986 INFO L225 Difference]: With dead ends: 2201 [2021-11-07 00:58:18,986 INFO L226 Difference]: Without dead ends: 1306 [2021-11-07 00:58:18,989 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:18,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1306 states. [2021-11-07 00:58:19,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1306 to 1137. [2021-11-07 00:58:19,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1137 states, 1135 states have (on average 1.7885462555066078) internal successors, (2030), 1136 states have internal predecessors, (2030), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:19,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1137 states to 1137 states and 2030 transitions. [2021-11-07 00:58:19,112 INFO L78 Accepts]: Start accepts. Automaton has 1137 states and 2030 transitions. Word has length 66 [2021-11-07 00:58:19,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:19,112 INFO L470 AbstractCegarLoop]: Abstraction has 1137 states and 2030 transitions. [2021-11-07 00:58:19,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:19,113 INFO L276 IsEmpty]: Start isEmpty. Operand 1137 states and 2030 transitions. [2021-11-07 00:58:19,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:58:19,116 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:19,116 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:19,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:19,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:19,333 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:19,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:19,333 INFO L85 PathProgramCache]: Analyzing trace with hash 2123805544, now seen corresponding path program 1 times [2021-11-07 00:58:19,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:19,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1730051220] [2021-11-07 00:58:19,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:19,334 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:19,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:19,335 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:19,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 00:58:19,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:19,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:19,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:20,131 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:20,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:20,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:20,329 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:20,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1730051220] [2021-11-07 00:58:20,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1730051220] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:20,330 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:20,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:58:20,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135308041] [2021-11-07 00:58:20,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:20,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:20,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:20,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:20,332 INFO L87 Difference]: Start difference. First operand 1137 states and 2030 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:20,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:20,538 INFO L93 Difference]: Finished difference Result 3055 states and 5486 transitions. [2021-11-07 00:58:20,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:20,539 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:58:20,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:20,555 INFO L225 Difference]: With dead ends: 3055 [2021-11-07 00:58:20,555 INFO L226 Difference]: Without dead ends: 2014 [2021-11-07 00:58:20,560 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:20,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2014 states. [2021-11-07 00:58:20,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2014 to 1845. [2021-11-07 00:58:20,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1845 states, 1843 states have (on average 1.801953336950624) internal successors, (3321), 1844 states have internal predecessors, (3321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:20,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1845 states to 1845 states and 3321 transitions. [2021-11-07 00:58:20,766 INFO L78 Accepts]: Start accepts. Automaton has 1845 states and 3321 transitions. Word has length 66 [2021-11-07 00:58:20,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:20,766 INFO L470 AbstractCegarLoop]: Abstraction has 1845 states and 3321 transitions. [2021-11-07 00:58:20,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:20,767 INFO L276 IsEmpty]: Start isEmpty. Operand 1845 states and 3321 transitions. [2021-11-07 00:58:20,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 00:58:20,778 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:20,779 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:20,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:20,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:20,997 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:20,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:20,998 INFO L85 PathProgramCache]: Analyzing trace with hash 1374114645, now seen corresponding path program 1 times [2021-11-07 00:58:20,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:20,999 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1978559690] [2021-11-07 00:58:20,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:21,000 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:21,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:21,001 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:21,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 00:58:21,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:21,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:21,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:21,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:21,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:22,118 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:22,119 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:22,119 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1978559690] [2021-11-07 00:58:22,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1978559690] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:22,119 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:22,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:58:22,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440180132] [2021-11-07 00:58:22,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:22,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:22,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:22,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:22,121 INFO L87 Difference]: Start difference. First operand 1845 states and 3321 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:22,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:22,392 INFO L93 Difference]: Finished difference Result 4915 states and 8878 transitions. [2021-11-07 00:58:22,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:22,393 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-07 00:58:22,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:22,420 INFO L225 Difference]: With dead ends: 4915 [2021-11-07 00:58:22,420 INFO L226 Difference]: Without dead ends: 3200 [2021-11-07 00:58:22,424 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:22,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3200 states. [2021-11-07 00:58:22,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3200 to 3031. [2021-11-07 00:58:22,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3031 states, 3029 states have (on average 1.8085176625949158) internal successors, (5478), 3030 states have internal predecessors, (5478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:22,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3031 states to 3031 states and 5478 transitions. [2021-11-07 00:58:22,761 INFO L78 Accepts]: Start accepts. Automaton has 3031 states and 5478 transitions. Word has length 67 [2021-11-07 00:58:22,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:22,762 INFO L470 AbstractCegarLoop]: Abstraction has 3031 states and 5478 transitions. [2021-11-07 00:58:22,763 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:22,763 INFO L276 IsEmpty]: Start isEmpty. Operand 3031 states and 5478 transitions. [2021-11-07 00:58:22,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 00:58:22,768 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:22,768 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:22,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:22,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:22,988 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:22,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:22,988 INFO L85 PathProgramCache]: Analyzing trace with hash 1138988279, now seen corresponding path program 1 times [2021-11-07 00:58:22,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:22,989 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [659752565] [2021-11-07 00:58:22,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:22,989 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:22,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:22,990 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:22,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 00:58:23,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:23,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:23,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:23,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:23,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:24,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:24,117 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:24,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [659752565] [2021-11-07 00:58:24,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [659752565] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:24,118 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:24,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:58:24,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141504057] [2021-11-07 00:58:24,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:24,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:24,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:24,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:24,120 INFO L87 Difference]: Start difference. First operand 3031 states and 5478 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:24,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:24,572 INFO L93 Difference]: Finished difference Result 8189 states and 14832 transitions. [2021-11-07 00:58:24,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:24,573 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 00:58:24,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:24,618 INFO L225 Difference]: With dead ends: 8189 [2021-11-07 00:58:24,618 INFO L226 Difference]: Without dead ends: 5322 [2021-11-07 00:58:24,624 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:24,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5322 states. [2021-11-07 00:58:25,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5322 to 5153. [2021-11-07 00:58:25,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5153 states, 5151 states have (on average 1.8107163657542225) internal successors, (9327), 5152 states have internal predecessors, (9327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:25,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5153 states to 5153 states and 9327 transitions. [2021-11-07 00:58:25,175 INFO L78 Accepts]: Start accepts. Automaton has 5153 states and 9327 transitions. Word has length 68 [2021-11-07 00:58:25,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:25,175 INFO L470 AbstractCegarLoop]: Abstraction has 5153 states and 9327 transitions. [2021-11-07 00:58:25,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:25,176 INFO L276 IsEmpty]: Start isEmpty. Operand 5153 states and 9327 transitions. [2021-11-07 00:58:25,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:58:25,183 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:25,184 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:25,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Ended with exit code 0 [2021-11-07 00:58:25,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:25,397 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:25,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:25,397 INFO L85 PathProgramCache]: Analyzing trace with hash 1892339571, now seen corresponding path program 1 times [2021-11-07 00:58:25,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:25,399 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1468799023] [2021-11-07 00:58:25,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:25,399 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:25,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:25,400 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:25,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 00:58:25,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:25,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:26,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:26,190 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:58:26,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:26,399 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:58:26,400 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:26,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1468799023] [2021-11-07 00:58:26,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1468799023] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:26,400 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:26,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:58:26,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140128818] [2021-11-07 00:58:26,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:58:26,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:26,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:58:26,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:58:26,401 INFO L87 Difference]: Start difference. First operand 5153 states and 9327 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:29,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:29,536 INFO L93 Difference]: Finished difference Result 19264 states and 34910 transitions. [2021-11-07 00:58:29,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 00:58:29,537 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 00:58:29,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:29,600 INFO L225 Difference]: With dead ends: 19264 [2021-11-07 00:58:29,600 INFO L226 Difference]: Without dead ends: 14351 [2021-11-07 00:58:29,633 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:58:29,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14351 states. [2021-11-07 00:58:30,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14351 to 5103. [2021-11-07 00:58:30,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5103 states, 5101 states have (on average 1.7892570084297197) internal successors, (9127), 5102 states have internal predecessors, (9127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:30,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5103 states to 5103 states and 9127 transitions. [2021-11-07 00:58:30,212 INFO L78 Accepts]: Start accepts. Automaton has 5103 states and 9127 transitions. Word has length 69 [2021-11-07 00:58:30,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:30,212 INFO L470 AbstractCegarLoop]: Abstraction has 5103 states and 9127 transitions. [2021-11-07 00:58:30,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:30,212 INFO L276 IsEmpty]: Start isEmpty. Operand 5103 states and 9127 transitions. [2021-11-07 00:58:30,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:58:30,218 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:30,218 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:30,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:30,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:30,439 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:30,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:30,439 INFO L85 PathProgramCache]: Analyzing trace with hash 995183300, now seen corresponding path program 1 times [2021-11-07 00:58:30,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:30,440 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [525554046] [2021-11-07 00:58:30,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:30,441 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:30,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:30,442 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:30,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 00:58:31,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:31,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:31,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:31,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:31,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:31,662 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:31,662 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:31,663 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [525554046] [2021-11-07 00:58:31,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [525554046] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:31,663 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:31,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:58:31,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795656604] [2021-11-07 00:58:31,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:31,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:31,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:31,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:31,664 INFO L87 Difference]: Start difference. First operand 5103 states and 9127 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:32,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:32,146 INFO L93 Difference]: Finished difference Result 14866 states and 26633 transitions. [2021-11-07 00:58:32,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:32,147 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 00:58:32,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:32,178 INFO L225 Difference]: With dead ends: 14866 [2021-11-07 00:58:32,178 INFO L226 Difference]: Without dead ends: 9930 [2021-11-07 00:58:32,187 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:32,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9930 states. [2021-11-07 00:58:33,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9930 to 9761. [2021-11-07 00:58:33,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9761 states, 9759 states have (on average 1.7895276155343784) internal successors, (17464), 9760 states have internal predecessors, (17464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:33,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9761 states to 9761 states and 17464 transitions. [2021-11-07 00:58:33,106 INFO L78 Accepts]: Start accepts. Automaton has 9761 states and 17464 transitions. Word has length 69 [2021-11-07 00:58:33,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:33,106 INFO L470 AbstractCegarLoop]: Abstraction has 9761 states and 17464 transitions. [2021-11-07 00:58:33,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:33,108 INFO L276 IsEmpty]: Start isEmpty. Operand 9761 states and 17464 transitions. [2021-11-07 00:58:33,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 00:58:33,115 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:33,116 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:33,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:33,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:33,333 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:33,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:33,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1364184488, now seen corresponding path program 1 times [2021-11-07 00:58:33,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:33,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2145224847] [2021-11-07 00:58:33,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:33,334 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:33,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:33,335 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:33,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 00:58:33,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:33,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:33,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:34,208 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:34,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:34,489 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:34,489 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:34,489 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2145224847] [2021-11-07 00:58:34,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2145224847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:34,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [847065] [2021-11-07 00:58:34,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:34,490 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:34,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:34,492 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:34,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 00:58:35,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:35,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:35,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:35,589 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:35,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:35,835 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:35,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [847065] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:35,835 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:35,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 00:58:35,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483627602] [2021-11-07 00:58:35,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:35,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:35,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:35,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:58:35,837 INFO L87 Difference]: Start difference. First operand 9761 states and 17464 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:36,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:36,524 INFO L93 Difference]: Finished difference Result 9877 states and 17656 transitions. [2021-11-07 00:58:36,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:36,525 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-07 00:58:36,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:36,558 INFO L225 Difference]: With dead ends: 9877 [2021-11-07 00:58:36,559 INFO L226 Difference]: Without dead ends: 9755 [2021-11-07 00:58:36,564 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 269 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:58:36,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9755 states. [2021-11-07 00:58:37,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9755 to 9755. [2021-11-07 00:58:37,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9755 states, 9754 states have (on average 1.7895222472831658) internal successors, (17455), 9754 states have internal predecessors, (17455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:37,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9755 states to 9755 states and 17455 transitions. [2021-11-07 00:58:37,323 INFO L78 Accepts]: Start accepts. Automaton has 9755 states and 17455 transitions. Word has length 70 [2021-11-07 00:58:37,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:37,324 INFO L470 AbstractCegarLoop]: Abstraction has 9755 states and 17455 transitions. [2021-11-07 00:58:37,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:37,324 INFO L276 IsEmpty]: Start isEmpty. Operand 9755 states and 17455 transitions. [2021-11-07 00:58:37,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 00:58:37,346 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:37,347 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:37,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:37,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:37,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:37,763 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:37,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:37,764 INFO L85 PathProgramCache]: Analyzing trace with hash 365857439, now seen corresponding path program 1 times [2021-11-07 00:58:37,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:37,764 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [375468879] [2021-11-07 00:58:37,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:37,765 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:37,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:37,766 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:37,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 00:58:38,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:38,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:38,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:38,756 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:38,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:39,071 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:39,071 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:39,071 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [375468879] [2021-11-07 00:58:39,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [375468879] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:39,071 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [314503056] [2021-11-07 00:58:39,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:39,071 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:39,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:39,072 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:39,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 00:58:40,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:40,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:58:40,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:40,531 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:40,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:40,888 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:40,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [314503056] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:40,889 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:40,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 00:58:40,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189907704] [2021-11-07 00:58:40,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 00:58:40,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:40,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 00:58:40,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:58:40,891 INFO L87 Difference]: Start difference. First operand 9755 states and 17455 transitions. Second operand has 10 states, 10 states have (on average 14.2) internal successors, (142), 10 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:46,600 INFO L93 Difference]: Finished difference Result 57922 states and 104206 transitions. [2021-11-07 00:58:46,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 00:58:46,601 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 14.2) internal successors, (142), 10 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 107 [2021-11-07 00:58:46,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:46,796 INFO L225 Difference]: With dead ends: 57922 [2021-11-07 00:58:46,796 INFO L226 Difference]: Without dead ends: 57777 [2021-11-07 00:58:46,815 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 410 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 00:58:46,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57777 states. [2021-11-07 00:58:49,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57777 to 19458. [2021-11-07 00:58:49,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19458 states, 19457 states have (on average 1.7897928765996813) internal successors, (34824), 19457 states have internal predecessors, (34824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19458 states to 19458 states and 34824 transitions. [2021-11-07 00:58:49,251 INFO L78 Accepts]: Start accepts. Automaton has 19458 states and 34824 transitions. Word has length 107 [2021-11-07 00:58:49,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:49,252 INFO L470 AbstractCegarLoop]: Abstraction has 19458 states and 34824 transitions. [2021-11-07 00:58:49,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 14.2) internal successors, (142), 10 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,253 INFO L276 IsEmpty]: Start isEmpty. Operand 19458 states and 34824 transitions. [2021-11-07 00:58:49,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-07 00:58:49,312 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:49,312 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:49,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:49,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:49,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:49,728 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:49,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:49,728 INFO L85 PathProgramCache]: Analyzing trace with hash 630742098, now seen corresponding path program 1 times [2021-11-07 00:58:49,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:49,729 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [971365645] [2021-11-07 00:58:49,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:49,729 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:49,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:49,730 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:49,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 00:58:50,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:50,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:58:50,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:50,859 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:50,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:51,146 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:51,147 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:51,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [971365645] [2021-11-07 00:58:51,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [971365645] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:51,147 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:51,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 00:58:51,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925882846] [2021-11-07 00:58:51,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:51,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:51,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:51,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:51,150 INFO L87 Difference]: Start difference. First operand 19458 states and 34824 transitions. Second operand has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:52,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:52,374 INFO L93 Difference]: Finished difference Result 38006 states and 68246 transitions. [2021-11-07 00:58:52,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:52,375 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2021-11-07 00:58:52,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:52,421 INFO L225 Difference]: With dead ends: 38006 [2021-11-07 00:58:52,422 INFO L226 Difference]: Without dead ends: 18791 [2021-11-07 00:58:52,452 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:58:52,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18791 states. [2021-11-07 00:58:53,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18791 to 9757. [2021-11-07 00:58:53,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9757 states, 9756 states have (on average 1.7890528905289054) internal successors, (17454), 9756 states have internal predecessors, (17454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:53,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9757 states to 9757 states and 17454 transitions. [2021-11-07 00:58:53,439 INFO L78 Accepts]: Start accepts. Automaton has 9757 states and 17454 transitions. Word has length 108 [2021-11-07 00:58:53,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:53,439 INFO L470 AbstractCegarLoop]: Abstraction has 9757 states and 17454 transitions. [2021-11-07 00:58:53,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:53,439 INFO L276 IsEmpty]: Start isEmpty. Operand 9757 states and 17454 transitions. [2021-11-07 00:58:53,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-07 00:58:53,461 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:53,462 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:53,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:53,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:53,676 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:53,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:53,677 INFO L85 PathProgramCache]: Analyzing trace with hash 766779628, now seen corresponding path program 1 times [2021-11-07 00:58:53,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:53,678 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1445500002] [2021-11-07 00:58:53,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:53,678 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:53,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:53,679 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:53,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 00:58:54,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:54,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:54,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:54,887 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:54,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:55,190 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:55,190 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:55,191 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1445500002] [2021-11-07 00:58:55,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1445500002] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:55,191 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [564870290] [2021-11-07 00:58:55,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:55,191 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:55,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:55,193 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:55,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 00:58:56,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:56,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:58:56,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:56,753 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:56,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:57,084 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 00:58:57,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [564870290] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:57,084 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:57,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 00:58:57,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129206491] [2021-11-07 00:58:57,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:58:57,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:57,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:58:57,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:58:57,087 INFO L87 Difference]: Start difference. First operand 9757 states and 17454 transitions. Second operand has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:59,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:59,958 INFO L93 Difference]: Finished difference Result 10009 states and 17872 transitions. [2021-11-07 00:58:59,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:58:59,959 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2021-11-07 00:58:59,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:59,982 INFO L225 Difference]: With dead ends: 10009 [2021-11-07 00:58:59,982 INFO L226 Difference]: Without dead ends: 9853 [2021-11-07 00:58:59,987 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 423 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 00:59:00,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9853 states. [2021-11-07 00:59:00,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9853 to 9753. [2021-11-07 00:59:00,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9753 states, 9752 states have (on average 1.788966365873667) internal successors, (17446), 9752 states have internal predecessors, (17446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:00,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9753 states to 9753 states and 17446 transitions. [2021-11-07 00:59:00,950 INFO L78 Accepts]: Start accepts. Automaton has 9753 states and 17446 transitions. Word has length 109 [2021-11-07 00:59:00,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:00,951 INFO L470 AbstractCegarLoop]: Abstraction has 9753 states and 17446 transitions. [2021-11-07 00:59:00,951 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:00,951 INFO L276 IsEmpty]: Start isEmpty. Operand 9753 states and 17446 transitions. [2021-11-07 00:59:00,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-07 00:59:00,965 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:00,966 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:00,999 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-11-07 00:59:01,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:01,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:01,399 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:01,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:01,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1012696798, now seen corresponding path program 1 times [2021-11-07 00:59:01,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:01,400 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1218872351] [2021-11-07 00:59:01,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:01,401 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:01,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:01,401 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:01,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 00:59:02,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:02,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:02,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:02,670 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:02,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:02,991 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:02,991 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:02,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1218872351] [2021-11-07 00:59:02,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1218872351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:02,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1402046697] [2021-11-07 00:59:02,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:02,992 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:02,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:02,994 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:02,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 00:59:04,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:04,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:59:04,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:05,210 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:05,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:05,763 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:05,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1402046697] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:05,764 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:05,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:59:05,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469125875] [2021-11-07 00:59:05,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:59:05,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:05,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:59:05,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:59:05,766 INFO L87 Difference]: Start difference. First operand 9753 states and 17446 transitions. Second operand has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:22,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:22,123 INFO L93 Difference]: Finished difference Result 20324 states and 36208 transitions. [2021-11-07 00:59:22,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 00:59:22,123 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-07 00:59:22,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:22,153 INFO L225 Difference]: With dead ends: 20324 [2021-11-07 00:59:22,154 INFO L226 Difference]: Without dead ends: 20190 [2021-11-07 00:59:22,162 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 420 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=212, Invalid=718, Unknown=0, NotChecked=0, Total=930 [2021-11-07 00:59:22,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20190 states. [2021-11-07 00:59:23,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20190 to 19316. [2021-11-07 00:59:23,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19316 states, 19315 states have (on average 1.7903701786176547) internal successors, (34581), 19315 states have internal predecessors, (34581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:23,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19316 states to 19316 states and 34581 transitions. [2021-11-07 00:59:23,557 INFO L78 Accepts]: Start accepts. Automaton has 19316 states and 34581 transitions. Word has length 111 [2021-11-07 00:59:23,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:23,557 INFO L470 AbstractCegarLoop]: Abstraction has 19316 states and 34581 transitions. [2021-11-07 00:59:23,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:23,558 INFO L276 IsEmpty]: Start isEmpty. Operand 19316 states and 34581 transitions. [2021-11-07 00:59:23,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 00:59:23,581 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:23,581 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:23,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:23,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:23,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:23,982 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:23,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:23,983 INFO L85 PathProgramCache]: Analyzing trace with hash -58339489, now seen corresponding path program 1 times [2021-11-07 00:59:23,983 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:23,983 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [128417403] [2021-11-07 00:59:23,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:23,984 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:23,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:23,985 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:23,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 00:59:25,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:25,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:25,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:25,506 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:25,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:25,859 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:25,859 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:25,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [128417403] [2021-11-07 00:59:25,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [128417403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:25,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [475988361] [2021-11-07 00:59:25,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:25,860 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:25,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:25,861 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:25,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 00:59:27,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:27,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:27,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:27,689 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:27,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:27,985 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:27,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [475988361] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:27,986 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:27,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 00:59:27,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479661170] [2021-11-07 00:59:27,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:59:27,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:27,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:59:27,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:59:27,987 INFO L87 Difference]: Start difference. First operand 19316 states and 34581 transitions. Second operand has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:29,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:29,138 INFO L93 Difference]: Finished difference Result 19473 states and 34839 transitions. [2021-11-07 00:59:29,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:59:29,139 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-07 00:59:29,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:29,179 INFO L225 Difference]: With dead ends: 19473 [2021-11-07 00:59:29,179 INFO L226 Difference]: Without dead ends: 19315 [2021-11-07 00:59:29,187 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:59:29,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19315 states. [2021-11-07 00:59:30,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19315 to 19315. [2021-11-07 00:59:30,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19315 states, 19314 states have (on average 1.7902557730143938) internal successors, (34577), 19314 states have internal predecessors, (34577), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:30,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19315 states to 19315 states and 34577 transitions. [2021-11-07 00:59:30,771 INFO L78 Accepts]: Start accepts. Automaton has 19315 states and 34577 transitions. Word has length 112 [2021-11-07 00:59:30,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:30,771 INFO L470 AbstractCegarLoop]: Abstraction has 19315 states and 34577 transitions. [2021-11-07 00:59:30,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:30,772 INFO L276 IsEmpty]: Start isEmpty. Operand 19315 states and 34577 transitions. [2021-11-07 00:59:30,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-07 00:59:30,792 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:30,792 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:30,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:31,001 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Ended with exit code 0 [2021-11-07 00:59:31,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:31,193 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:31,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:31,194 INFO L85 PathProgramCache]: Analyzing trace with hash 1966673289, now seen corresponding path program 1 times [2021-11-07 00:59:31,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:31,194 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1668454132] [2021-11-07 00:59:31,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:31,194 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:31,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:31,195 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:31,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 00:59:32,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:32,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:32,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:32,859 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:32,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:33,273 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:33,273 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:33,273 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1668454132] [2021-11-07 00:59:33,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1668454132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:33,273 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [780025326] [2021-11-07 00:59:33,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:33,274 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:33,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:33,275 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:33,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 00:59:34,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:34,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:59:34,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:35,692 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:35,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:36,229 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:36,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [780025326] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:36,229 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:36,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:59:36,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794830497] [2021-11-07 00:59:36,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:59:36,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:36,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:59:36,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:59:36,231 INFO L87 Difference]: Start difference. First operand 19315 states and 34577 transitions. Second operand has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:57,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:57,412 INFO L93 Difference]: Finished difference Result 39684 states and 70837 transitions. [2021-11-07 00:59:57,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 00:59:57,412 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-07 00:59:57,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:57,478 INFO L225 Difference]: With dead ends: 39684 [2021-11-07 00:59:57,478 INFO L226 Difference]: Without dead ends: 39446 [2021-11-07 00:59:57,486 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 428 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=195, Invalid=675, Unknown=0, NotChecked=0, Total=870 [2021-11-07 00:59:57,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39446 states. [2021-11-07 01:00:00,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39446 to 38360. [2021-11-07 01:00:00,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38360 states, 38359 states have (on average 1.7910529471571208) internal successors, (68703), 38359 states have internal predecessors, (68703), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:00,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38360 states to 38360 states and 68703 transitions. [2021-11-07 01:00:00,290 INFO L78 Accepts]: Start accepts. Automaton has 38360 states and 68703 transitions. Word has length 113 [2021-11-07 01:00:00,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:00,291 INFO L470 AbstractCegarLoop]: Abstraction has 38360 states and 68703 transitions. [2021-11-07 01:00:00,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:00,291 INFO L276 IsEmpty]: Start isEmpty. Operand 38360 states and 68703 transitions. [2021-11-07 01:00:00,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-07 01:00:00,362 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:00,363 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:00,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:00,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:00,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:00,789 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:00,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:00,789 INFO L85 PathProgramCache]: Analyzing trace with hash -789953977, now seen corresponding path program 1 times [2021-11-07 01:00:00,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:00,790 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [380954806] [2021-11-07 01:00:00,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:00,791 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:00,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:00,792 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:00,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 01:00:02,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:02,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:02,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:02,584 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 01:00:02,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:03,069 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 01:00:03,069 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:03,069 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [380954806] [2021-11-07 01:00:03,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [380954806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:03,069 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1418940155] [2021-11-07 01:00:03,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:03,069 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:03,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:03,070 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:03,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 01:00:04,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:04,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:00:04,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:05,242 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 01:00:05,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:05,610 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 01:00:05,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1418940155] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:05,610 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:05,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 01:00:05,611 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969046549] [2021-11-07 01:00:05,611 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:05,611 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:05,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:05,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:00:05,612 INFO L87 Difference]: Start difference. First operand 38360 states and 68703 transitions. Second operand has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:08,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:08,103 INFO L93 Difference]: Finished difference Result 40735 states and 72582 transitions. [2021-11-07 01:00:08,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:00:08,104 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-07 01:00:08,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:08,157 INFO L225 Difference]: With dead ends: 40735 [2021-11-07 01:00:08,157 INFO L226 Difference]: Without dead ends: 39405 [2021-11-07 01:00:08,169 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:00:08,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39405 states. [2021-11-07 01:00:11,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39405 to 38416. [2021-11-07 01:00:11,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38416 states, 38415 states have (on average 1.7905245346869711) internal successors, (68783), 38415 states have internal predecessors, (68783), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:11,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38416 states to 38416 states and 68783 transitions. [2021-11-07 01:00:11,296 INFO L78 Accepts]: Start accepts. Automaton has 38416 states and 68783 transitions. Word has length 113 [2021-11-07 01:00:11,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:11,297 INFO L470 AbstractCegarLoop]: Abstraction has 38416 states and 68783 transitions. [2021-11-07 01:00:11,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:11,297 INFO L276 IsEmpty]: Start isEmpty. Operand 38416 states and 68783 transitions. [2021-11-07 01:00:11,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-07 01:00:11,335 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:11,335 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:11,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:11,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:11,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:11,736 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:11,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:11,736 INFO L85 PathProgramCache]: Analyzing trace with hash 1696535569, now seen corresponding path program 1 times [2021-11-07 01:00:11,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:11,737 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [5687656] [2021-11-07 01:00:11,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:11,737 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:11,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:11,738 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:11,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:00:13,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:13,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:13,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:13,309 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 01:00:13,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:13,632 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 01:00:13,632 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:13,633 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [5687656] [2021-11-07 01:00:13,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [5687656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:13,633 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [107669862] [2021-11-07 01:00:13,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:13,633 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:13,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:13,634 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:13,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:00:15,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:15,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:00:15,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:15,941 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 01:00:15,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:16,207 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 01:00:16,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [107669862] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:16,208 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:16,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:00:16,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514675048] [2021-11-07 01:00:16,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:00:16,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:16,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:00:16,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:00:16,210 INFO L87 Difference]: Start difference. First operand 38416 states and 68783 transitions. Second operand has 9 states, 9 states have (on average 12.0) internal successors, (108), 9 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:19,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:19,146 INFO L93 Difference]: Finished difference Result 39088 states and 69879 transitions. [2021-11-07 01:00:19,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 01:00:19,147 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 12.0) internal successors, (108), 9 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-07 01:00:19,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:19,205 INFO L225 Difference]: With dead ends: 39088 [2021-11-07 01:00:19,205 INFO L226 Difference]: Without dead ends: 38665 [2021-11-07 01:00:19,213 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=165, Invalid=591, Unknown=0, NotChecked=0, Total=756 [2021-11-07 01:00:19,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38665 states. [2021-11-07 01:00:22,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38665 to 38352. [2021-11-07 01:00:22,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38352 states, 38351 states have (on average 1.7906964616307266) internal successors, (68675), 38351 states have internal predecessors, (68675), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:22,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38352 states to 38352 states and 68675 transitions. [2021-11-07 01:00:22,472 INFO L78 Accepts]: Start accepts. Automaton has 38352 states and 68675 transitions. Word has length 114 [2021-11-07 01:00:22,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:22,472 INFO L470 AbstractCegarLoop]: Abstraction has 38352 states and 68675 transitions. [2021-11-07 01:00:22,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 12.0) internal successors, (108), 9 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:22,473 INFO L276 IsEmpty]: Start isEmpty. Operand 38352 states and 68675 transitions. [2021-11-07 01:00:22,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 01:00:22,521 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:22,521 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:22,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-07 01:00:22,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-11-07 01:00:22,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:22,922 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:22,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:22,923 INFO L85 PathProgramCache]: Analyzing trace with hash 406703181, now seen corresponding path program 1 times [2021-11-07 01:00:22,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:22,924 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [20753783] [2021-11-07 01:00:22,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:22,924 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:22,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:22,925 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:22,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:00:24,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:24,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:24,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:24,932 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 01:00:24,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:25,354 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 01:00:25,354 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:25,354 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [20753783] [2021-11-07 01:00:25,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [20753783] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:25,355 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1053446190] [2021-11-07 01:00:25,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:25,355 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:25,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:25,356 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:25,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:00:27,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:27,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:00:27,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:28,045 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 01:00:28,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:28,333 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 01:00:28,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1053446190] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:28,333 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:28,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:00:28,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382943472] [2021-11-07 01:00:28,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:00:28,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:28,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:00:28,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:00:28,336 INFO L87 Difference]: Start difference. First operand 38352 states and 68675 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:31,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:31,419 INFO L93 Difference]: Finished difference Result 38952 states and 69622 transitions. [2021-11-07 01:00:31,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:00:31,420 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 01:00:31,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:31,477 INFO L225 Difference]: With dead ends: 38952 [2021-11-07 01:00:31,477 INFO L226 Difference]: Without dead ends: 38510 [2021-11-07 01:00:31,485 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:00:31,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38510 states. [2021-11-07 01:00:34,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38510 to 38351. [2021-11-07 01:00:34,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38351 states, 38350 states have (on average 1.7902477183833116) internal successors, (68656), 38350 states have internal predecessors, (68656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:34,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38351 states to 38351 states and 68656 transitions. [2021-11-07 01:00:34,173 INFO L78 Accepts]: Start accepts. Automaton has 38351 states and 68656 transitions. Word has length 116 [2021-11-07 01:00:34,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:34,174 INFO L470 AbstractCegarLoop]: Abstraction has 38351 states and 68656 transitions. [2021-11-07 01:00:34,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:34,174 INFO L276 IsEmpty]: Start isEmpty. Operand 38351 states and 68656 transitions. [2021-11-07 01:00:34,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 01:00:34,218 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:34,218 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:34,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:34,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:34,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:34,619 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:34,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:34,620 INFO L85 PathProgramCache]: Analyzing trace with hash 837820183, now seen corresponding path program 1 times [2021-11-07 01:00:34,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:34,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [529633423] [2021-11-07 01:00:34,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:34,621 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:34,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:34,621 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:34,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 01:00:36,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:36,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:36,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:36,497 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 01:00:36,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:36,967 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 01:00:36,967 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:36,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [529633423] [2021-11-07 01:00:36,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [529633423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:36,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1312971523] [2021-11-07 01:00:36,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:36,968 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:36,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:36,990 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:37,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 01:00:39,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:39,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:00:39,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:39,710 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 01:00:39,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:40,083 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 01:00:40,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1312971523] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:40,083 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:40,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 01:00:40,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864094110] [2021-11-07 01:00:40,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:00:40,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:40,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:00:40,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:00:40,085 INFO L87 Difference]: Start difference. First operand 38351 states and 68656 transitions. Second operand has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:44,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:44,892 INFO L93 Difference]: Finished difference Result 38945 states and 69595 transitions. [2021-11-07 01:00:44,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 01:00:44,893 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 01:00:44,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:44,948 INFO L225 Difference]: With dead ends: 38945 [2021-11-07 01:00:44,948 INFO L226 Difference]: Without dead ends: 38478 [2021-11-07 01:00:44,956 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 449 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-07 01:00:44,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38478 states. [2021-11-07 01:00:47,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38478 to 38325. [2021-11-07 01:00:47,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38325 states, 38324 states have (on average 1.7902880701388164) internal successors, (68611), 38324 states have internal predecessors, (68611), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:47,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38325 states to 38325 states and 68611 transitions. [2021-11-07 01:00:47,585 INFO L78 Accepts]: Start accepts. Automaton has 38325 states and 68611 transitions. Word has length 116 [2021-11-07 01:00:47,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:47,585 INFO L470 AbstractCegarLoop]: Abstraction has 38325 states and 68611 transitions. [2021-11-07 01:00:47,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:47,585 INFO L276 IsEmpty]: Start isEmpty. Operand 38325 states and 68611 transitions. [2021-11-07 01:00:47,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 01:00:47,625 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:47,625 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:47,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:47,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:48,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:48,029 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:48,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:48,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1843067694, now seen corresponding path program 1 times [2021-11-07 01:00:48,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:48,030 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [60233365] [2021-11-07 01:00:48,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:48,030 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:48,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:48,033 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:48,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 01:00:49,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:49,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:49,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:49,994 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 01:00:49,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:50,314 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 01:00:50,315 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:50,315 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [60233365] [2021-11-07 01:00:50,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [60233365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:50,315 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [422040179] [2021-11-07 01:00:50,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:50,315 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:50,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:50,316 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:50,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 01:00:52,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:52,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:00:52,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:52,895 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 01:00:52,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:53,159 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 01:00:53,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [422040179] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:53,159 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:53,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:00:53,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664974519] [2021-11-07 01:00:53,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:00:53,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:53,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:00:53,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:00:53,161 INFO L87 Difference]: Start difference. First operand 38325 states and 68611 transitions. Second operand has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:55,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:55,705 INFO L93 Difference]: Finished difference Result 38943 states and 69604 transitions. [2021-11-07 01:00:55,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:00:55,706 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 01:00:55,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:55,775 INFO L225 Difference]: With dead ends: 38943 [2021-11-07 01:00:55,776 INFO L226 Difference]: Without dead ends: 38465 [2021-11-07 01:00:55,785 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:00:55,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38465 states. [2021-11-07 01:00:58,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38465 to 38061. [2021-11-07 01:00:58,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38061 states, 38060 states have (on average 1.7861271676300579) internal successors, (67980), 38060 states have internal predecessors, (67980), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:58,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38061 states to 38061 states and 67980 transitions. [2021-11-07 01:00:58,597 INFO L78 Accepts]: Start accepts. Automaton has 38061 states and 67980 transitions. Word has length 116 [2021-11-07 01:00:58,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:58,597 INFO L470 AbstractCegarLoop]: Abstraction has 38061 states and 67980 transitions. [2021-11-07 01:00:58,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:58,598 INFO L276 IsEmpty]: Start isEmpty. Operand 38061 states and 67980 transitions. [2021-11-07 01:00:58,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-07 01:00:58,643 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:58,643 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:58,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:58,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:59,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:59,049 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:59,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:59,049 INFO L85 PathProgramCache]: Analyzing trace with hash 972614723, now seen corresponding path program 1 times [2021-11-07 01:00:59,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:59,050 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [701022675] [2021-11-07 01:00:59,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:59,050 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:59,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:59,051 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:59,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b380c87-eee5-412a-830f-94c8768df364/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 01:01:00,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:00,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:01:00,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:01,063 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 01:01:01,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:01,391 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 01:01:01,392 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:01:01,392 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [701022675] [2021-11-07 01:01:01,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [701022675] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:01:01,392 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:01:01,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:01:01,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325805952] [2021-11-07 01:01:01,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:01:01,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:01:01,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:01:01,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:01:01,394 INFO L87 Difference]: Start difference. First operand 38061 states and 67980 transitions. Second operand has 6 states, 6 states have (on average 24.5) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:11,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:11,074 INFO L93 Difference]: Finished difference Result 139376 states and 247637 transitions. [2021-11-07 01:01:11,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:01:11,075 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 24.5) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-07 01:01:11,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:11,273 INFO L225 Difference]: With dead ends: 139376 [2021-11-07 01:01:11,273 INFO L226 Difference]: Without dead ends: 101562 [2021-11-07 01:01:11,315 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 240 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:01:11,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101562 states.