./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec6_product31.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/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_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec6_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/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_47220ed8-903c-4b93-b285-09e60a0af083/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 bad89116a36bb46e02a3fc807805b2b6d03550190d8073d361f25c2754b15f25 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:38:31,713 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:38:31,717 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:38:31,785 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:38:31,786 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:38:31,792 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:38:31,794 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:38:31,799 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:38:31,803 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:38:31,810 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:38:31,811 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:38:31,814 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:38:31,815 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:38:31,818 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:38:31,821 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:38:31,831 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:38:31,833 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:38:31,835 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:38:31,838 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:38:31,847 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:38:31,850 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:38:31,852 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:38:31,856 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:38:31,857 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:38:31,869 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:38:31,870 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:38:31,870 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:38:31,873 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:38:31,874 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:38:31,876 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:38:31,876 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:38:31,878 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:38:31,880 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:38:31,882 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:38:31,884 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:38:31,884 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:38:31,885 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:38:31,886 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:38:31,886 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:38:31,887 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:38:31,888 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:38:31,889 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:38:31,942 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:38:31,943 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:38:31,945 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:38:31,946 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:38:31,946 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:38:31,947 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:38:31,947 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:38:31,947 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:38:31,955 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:38:31,956 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:38:31,957 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:38:31,958 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:38:31,958 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:38:31,959 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:38:31,959 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:38:31,960 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:38:31,961 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:38:31,961 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:38:31,961 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:38:31,962 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:38:31,962 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:38:31,962 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:38:31,963 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:38:31,963 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:38:31,964 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:38:31,964 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:38:31,964 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:38:31,965 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:38:31,965 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:38:31,965 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:38:31,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:38:31,966 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:38:31,967 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:38:31,967 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:38:31,968 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:38:31,968 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:38:31,968 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:38:31,969 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:38:31,969 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:38:31,969 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_47220ed8-903c-4b93-b285-09e60a0af083/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bad89116a36bb46e02a3fc807805b2b6d03550190d8073d361f25c2754b15f25 [2021-11-07 01:38:32,389 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:38:32,423 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:38:32,426 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:38:32,429 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:38:32,430 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:38:32,431 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec6_product31.cil.c [2021-11-07 01:38:32,527 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data/0eff1d889/97e431a80b774d03a032baff4dd28a90/FLAG60b1966c1 [2021-11-07 01:38:33,366 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:38:33,367 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/sv-benchmarks/c/product-lines/email_spec6_product31.cil.c [2021-11-07 01:38:33,403 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data/0eff1d889/97e431a80b774d03a032baff4dd28a90/FLAG60b1966c1 [2021-11-07 01:38:33,513 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data/0eff1d889/97e431a80b774d03a032baff4dd28a90 [2021-11-07 01:38:33,518 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:38:33,521 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:38:33,525 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:38:33,526 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:38:33,530 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:38:33,531 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:38:33" (1/1) ... [2021-11-07 01:38:33,535 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c4304ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:33, skipping insertion in model container [2021-11-07 01:38:33,535 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:38:33" (1/1) ... [2021-11-07 01:38:33,544 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:38:33,682 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:38:34,164 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_47220ed8-903c-4b93-b285-09e60a0af083/sv-benchmarks/c/product-lines/email_spec6_product31.cil.c[31008,31021] [2021-11-07 01:38:34,484 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:38:34,509 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 01:38:34,510 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@7b457acb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:34, skipping insertion in model container [2021-11-07 01:38:34,510 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:38:34,511 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 01:38:34,514 INFO L168 Benchmark]: Toolchain (without parser) took 991.34 ms. Allocated memory is still 117.4 MB. Free memory was 71.6 MB in the beginning and 78.0 MB in the end (delta: -6.4 MB). Peak memory consumption was 9.2 MB. Max. memory is 16.1 GB. [2021-11-07 01:38:34,516 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 117.4 MB. Free memory is still 90.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:38:34,518 INFO L168 Benchmark]: CACSL2BoogieTranslator took 985.36 ms. Allocated memory is still 117.4 MB. Free memory was 71.4 MB in the beginning and 78.0 MB in the end (delta: -6.6 MB). Peak memory consumption was 7.1 MB. Max. memory is 16.1 GB. [2021-11-07 01:38:34,520 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 117.4 MB. Free memory is still 90.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 985.36 ms. Allocated memory is still 117.4 MB. Free memory was 71.4 MB in the beginning and 78.0 MB in the end (delta: -6.6 MB). Peak memory consumption was 7.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 1343]: 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_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/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_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec6_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/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_47220ed8-903c-4b93-b285-09e60a0af083/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 bad89116a36bb46e02a3fc807805b2b6d03550190d8073d361f25c2754b15f25 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:38:37,384 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:38:37,387 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:38:37,441 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:38:37,442 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:38:37,443 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:38:37,446 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:38:37,449 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:38:37,452 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:38:37,454 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:38:37,456 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:38:37,458 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:38:37,459 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:38:37,460 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:38:37,463 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:38:37,465 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:38:37,467 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:38:37,468 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:38:37,472 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:38:37,475 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:38:37,478 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:38:37,481 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:38:37,483 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:38:37,484 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:38:37,489 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:38:37,490 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:38:37,491 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:38:37,492 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:38:37,493 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:38:37,495 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:38:37,495 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:38:37,502 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:38:37,505 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:38:37,506 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:38:37,520 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:38:37,520 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:38:37,522 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:38:37,522 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:38:37,522 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:38:37,525 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:38:37,526 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:38:37,533 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 01:38:37,593 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:38:37,594 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:38:37,596 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:38:37,596 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:38:37,596 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:38:37,597 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:38:37,597 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:38:37,597 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:38:37,597 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:38:37,599 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:38:37,601 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:38:37,601 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:38:37,602 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:38:37,602 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:38:37,602 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:38:37,602 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:38:37,603 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:38:37,603 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 01:38:37,603 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 01:38:37,603 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:38:37,604 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:38:37,604 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:38:37,604 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:38:37,605 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:38:37,605 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 01:38:37,605 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:38:37,606 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:38:37,606 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:38:37,606 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:38:37,606 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:38:37,607 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 01:38:37,607 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 01:38:37,607 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:38:37,608 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:38:37,608 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:38:37,608 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_47220ed8-903c-4b93-b285-09e60a0af083/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bad89116a36bb46e02a3fc807805b2b6d03550190d8073d361f25c2754b15f25 [2021-11-07 01:38:38,109 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:38:38,142 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:38:38,146 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:38:38,147 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:38:38,148 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:38:38,150 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec6_product31.cil.c [2021-11-07 01:38:38,236 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data/2d20c4953/9fa9039f91e74290b4e96420aae13185/FLAGbc5211c51 [2021-11-07 01:38:39,058 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:38:39,059 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/sv-benchmarks/c/product-lines/email_spec6_product31.cil.c [2021-11-07 01:38:39,083 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data/2d20c4953/9fa9039f91e74290b4e96420aae13185/FLAGbc5211c51 [2021-11-07 01:38:39,225 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/data/2d20c4953/9fa9039f91e74290b4e96420aae13185 [2021-11-07 01:38:39,229 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:38:39,232 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:38:39,235 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:38:39,235 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:38:39,239 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:38:39,240 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:38:39" (1/1) ... [2021-11-07 01:38:39,242 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12c9e2c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:39, skipping insertion in model container [2021-11-07 01:38:39,243 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:38:39" (1/1) ... [2021-11-07 01:38:39,253 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:38:39,361 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:38:39,822 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_47220ed8-903c-4b93-b285-09e60a0af083/sv-benchmarks/c/product-lines/email_spec6_product31.cil.c[31008,31021] [2021-11-07 01:38:40,102 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:38:40,134 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 01:38:40,162 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:38:40,264 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_47220ed8-903c-4b93-b285-09e60a0af083/sv-benchmarks/c/product-lines/email_spec6_product31.cil.c[31008,31021] [2021-11-07 01:38:40,357 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:38:40,370 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:38:40,447 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_47220ed8-903c-4b93-b285-09e60a0af083/sv-benchmarks/c/product-lines/email_spec6_product31.cil.c[31008,31021] [2021-11-07 01:38:40,491 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:38:40,538 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:38:40,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40 WrapperNode [2021-11-07 01:38:40,538 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:38:40,540 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:38:40,540 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:38:40,541 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:38:40,550 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,635 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,768 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:38:40,769 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:38:40,769 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:38:40,769 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:38:40,779 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,780 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,792 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,793 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,845 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,886 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,914 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,931 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:38:40,933 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:38:40,933 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:38:40,933 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:38:40,934 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (1/1) ... [2021-11-07 01:38:40,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:38:40,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:38:41,012 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:38:41,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:38:41,075 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 01:38:41,075 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:38:41,076 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 01:38:41,076 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:38:41,076 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:38:46,408 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:38:46,409 INFO L299 CfgBuilder]: Removed 387 assume(true) statements. [2021-11-07 01:38:46,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:38:46 BoogieIcfgContainer [2021-11-07 01:38:46,413 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:38:46,416 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:38:46,416 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:38:46,420 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:38:46,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:38:39" (1/3) ... [2021-11-07 01:38:46,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e809bef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:38:46, skipping insertion in model container [2021-11-07 01:38:46,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:38:40" (2/3) ... [2021-11-07 01:38:46,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e809bef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:38:46, skipping insertion in model container [2021-11-07 01:38:46,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:38:46" (3/3) ... [2021-11-07 01:38:46,423 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec6_product31.cil.c [2021-11-07 01:38:46,430 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:38:46,430 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 01:38:46,493 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:38:46,501 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 01:38:46,501 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 01:38:46,536 INFO L276 IsEmpty]: Start isEmpty. Operand has 581 states, 578 states have (on average 1.7335640138408304) internal successors, (1002), 580 states have internal predecessors, (1002), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:46,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 01:38:46,552 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:46,553 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] [2021-11-07 01:38:46,554 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:46,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:46,561 INFO L85 PathProgramCache]: Analyzing trace with hash -1078464191, now seen corresponding path program 1 times [2021-11-07 01:38:46,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:46,579 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [827623597] [2021-11-07 01:38:46,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:46,581 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:46,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:46,585 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:46,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 01:38:47,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:47,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 01:38:47,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:47,461 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 01:38:47,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:47,637 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 01:38:47,638 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:47,639 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [827623597] [2021-11-07 01:38:47,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [827623597] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:47,640 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:47,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 01:38:47,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550604633] [2021-11-07 01:38:47,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 01:38:47,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:47,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 01:38:47,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:38:47,671 INFO L87 Difference]: Start difference. First operand has 581 states, 578 states have (on average 1.7335640138408304) internal successors, (1002), 580 states have internal predecessors, (1002), 0 states have call successors, (0), 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 27.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:47,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:47,749 INFO L93 Difference]: Finished difference Result 920 states and 1563 transitions. [2021-11-07 01:38:47,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 01:38:47,751 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 27.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 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 54 [2021-11-07 01:38:47,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:47,772 INFO L225 Difference]: With dead ends: 920 [2021-11-07 01:38:47,772 INFO L226 Difference]: Without dead ends: 475 [2021-11-07 01:38:47,779 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 106 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 01:38:47,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-11-07 01:38:47,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 475. [2021-11-07 01:38:47,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 473 states have (on average 1.73784355179704) internal successors, (822), 474 states have internal predecessors, (822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:47,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 822 transitions. [2021-11-07 01:38:47,866 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 822 transitions. Word has length 54 [2021-11-07 01:38:47,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:47,866 INFO L470 AbstractCegarLoop]: Abstraction has 475 states and 822 transitions. [2021-11-07 01:38:47,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 27.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:47,867 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 822 transitions. [2021-11-07 01:38:47,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 01:38:47,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:47,873 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:38:47,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:38:48,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:48,080 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:48,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:48,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1792828846, now seen corresponding path program 1 times [2021-11-07 01:38:48,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:48,083 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [61946664] [2021-11-07 01:38:48,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:48,083 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:48,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:48,085 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:48,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 01:38:48,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:48,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:38:48,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:48,873 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 01:38:48,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:49,083 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 01:38:49,083 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:49,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [61946664] [2021-11-07 01:38:49,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [61946664] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:49,085 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:49,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:38:49,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579587196] [2021-11-07 01:38:49,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:38:49,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:49,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:38:49,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:38:49,093 INFO L87 Difference]: Start difference. First operand 475 states and 822 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:49,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:49,225 INFO L93 Difference]: Finished difference Result 1395 states and 2418 transitions. [2021-11-07 01:38:49,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:38:49,226 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 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 55 [2021-11-07 01:38:49,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:49,236 INFO L225 Difference]: With dead ends: 1395 [2021-11-07 01:38:49,236 INFO L226 Difference]: Without dead ends: 935 [2021-11-07 01:38:49,243 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 106 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 01:38:49,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 935 states. [2021-11-07 01:38:49,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 935 to 474. [2021-11-07 01:38:49,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 472 states have (on average 1.7309322033898304) internal successors, (817), 473 states have internal predecessors, (817), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:49,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 817 transitions. [2021-11-07 01:38:49,316 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 817 transitions. Word has length 55 [2021-11-07 01:38:49,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:49,317 INFO L470 AbstractCegarLoop]: Abstraction has 474 states and 817 transitions. [2021-11-07 01:38:49,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:49,318 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 817 transitions. [2021-11-07 01:38:49,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 01:38:49,328 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:49,329 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] [2021-11-07 01:38:49,351 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-07 01:38:49,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:49,545 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:49,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:49,546 INFO L85 PathProgramCache]: Analyzing trace with hash -1470339948, now seen corresponding path program 1 times [2021-11-07 01:38:49,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:49,550 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [163836996] [2021-11-07 01:38:49,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:49,550 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:49,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:49,578 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:49,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 01:38:50,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:50,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:38:50,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:50,298 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 01:38:50,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:50,455 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 01:38:50,456 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:50,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [163836996] [2021-11-07 01:38:50,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [163836996] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:50,456 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:50,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:38:50,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139383036] [2021-11-07 01:38:50,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:38:50,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:50,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:38:50,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:38:50,463 INFO L87 Difference]: Start difference. First operand 474 states and 817 transitions. Second operand has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:50,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:50,767 INFO L93 Difference]: Finished difference Result 1813 states and 3130 transitions. [2021-11-07 01:38:50,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:38:50,768 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-07 01:38:50,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:50,781 INFO L225 Difference]: With dead ends: 1813 [2021-11-07 01:38:50,782 INFO L226 Difference]: Without dead ends: 1357 [2021-11-07 01:38:50,783 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 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 01:38:50,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1357 states. [2021-11-07 01:38:50,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1357 to 473. [2021-11-07 01:38:50,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 471 states have (on average 1.7261146496815287) internal successors, (813), 472 states have internal predecessors, (813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:50,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 813 transitions. [2021-11-07 01:38:50,846 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 813 transitions. Word has length 57 [2021-11-07 01:38:50,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:50,846 INFO L470 AbstractCegarLoop]: Abstraction has 473 states and 813 transitions. [2021-11-07 01:38:50,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:50,849 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 813 transitions. [2021-11-07 01:38:50,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-07 01:38:50,851 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:50,851 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] [2021-11-07 01:38:50,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:38:51,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:51,070 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:51,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:51,070 INFO L85 PathProgramCache]: Analyzing trace with hash -500572697, now seen corresponding path program 1 times [2021-11-07 01:38:51,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:51,075 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [786711778] [2021-11-07 01:38:51,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:51,076 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:51,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:51,078 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:51,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 01:38:51,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:51,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:38:51,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:51,786 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 01:38:51,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:51,955 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 01:38:51,955 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:51,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [786711778] [2021-11-07 01:38:51,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [786711778] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:51,957 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:51,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:38:51,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936226298] [2021-11-07 01:38:51,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:38:51,959 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:51,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:38:51,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:38:51,961 INFO L87 Difference]: Start difference. First operand 473 states and 813 transitions. Second operand has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:52,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:52,118 INFO L93 Difference]: Finished difference Result 943 states and 1623 transitions. [2021-11-07 01:38:52,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:38:52,119 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 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 58 [2021-11-07 01:38:52,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:52,123 INFO L225 Difference]: With dead ends: 943 [2021-11-07 01:38:52,123 INFO L226 Difference]: Without dead ends: 478 [2021-11-07 01:38:52,124 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 112 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 01:38:52,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2021-11-07 01:38:52,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 473. [2021-11-07 01:38:52,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 471 states have (on average 1.7197452229299364) internal successors, (810), 472 states have internal predecessors, (810), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:52,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 810 transitions. [2021-11-07 01:38:52,174 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 810 transitions. Word has length 58 [2021-11-07 01:38:52,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:52,175 INFO L470 AbstractCegarLoop]: Abstraction has 473 states and 810 transitions. [2021-11-07 01:38:52,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:52,177 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 810 transitions. [2021-11-07 01:38:52,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-07 01:38:52,180 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:52,181 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] [2021-11-07 01:38:52,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:38:52,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:52,398 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:52,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:52,399 INFO L85 PathProgramCache]: Analyzing trace with hash -2115759748, now seen corresponding path program 1 times [2021-11-07 01:38:52,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:52,400 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [554296217] [2021-11-07 01:38:52,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:52,401 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:52,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:52,409 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:52,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 01:38:52,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:52,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:38:52,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:53,154 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 01:38:53,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:53,362 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 01:38:53,363 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:53,363 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [554296217] [2021-11-07 01:38:53,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [554296217] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:53,363 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:53,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:38:53,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107022089] [2021-11-07 01:38:53,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:38:53,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:53,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:38:53,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:38:53,366 INFO L87 Difference]: Start difference. First operand 473 states and 810 transitions. Second operand has 6 states, 6 states have (on average 10.833333333333334) internal successors, (65), 6 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 01:38:53,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:53,669 INFO L93 Difference]: Finished difference Result 1800 states and 3106 transitions. [2021-11-07 01:38:53,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:38:53,670 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.833333333333334) internal successors, (65), 6 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 59 [2021-11-07 01:38:53,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:53,681 INFO L225 Difference]: With dead ends: 1800 [2021-11-07 01:38:53,681 INFO L226 Difference]: Without dead ends: 1353 [2021-11-07 01:38:53,682 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 112 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 01:38:53,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1353 states. [2021-11-07 01:38:53,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1353 to 473. [2021-11-07 01:38:53,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 471 states have (on average 1.713375796178344) internal successors, (807), 472 states have internal predecessors, (807), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:53,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 807 transitions. [2021-11-07 01:38:53,738 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 807 transitions. Word has length 59 [2021-11-07 01:38:53,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:53,739 INFO L470 AbstractCegarLoop]: Abstraction has 473 states and 807 transitions. [2021-11-07 01:38:53,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.833333333333334) internal successors, (65), 6 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 01:38:53,740 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 807 transitions. [2021-11-07 01:38:53,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-07 01:38:53,741 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:53,741 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] [2021-11-07 01:38:53,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:38:53,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:53,960 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:53,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:53,960 INFO L85 PathProgramCache]: Analyzing trace with hash -1184941513, now seen corresponding path program 1 times [2021-11-07 01:38:53,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:53,961 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2062966627] [2021-11-07 01:38:53,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:53,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:53,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:53,964 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:54,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 01:38:54,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:54,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:38:54,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:54,677 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 01:38:54,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:54,873 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 01:38:54,873 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:54,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2062966627] [2021-11-07 01:38:54,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2062966627] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:54,874 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:54,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:38:54,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823782491] [2021-11-07 01:38:54,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:38:54,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:54,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:38:54,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:38:54,876 INFO L87 Difference]: Start difference. First operand 473 states and 807 transitions. Second operand has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 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 01:38:54,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:54,973 INFO L93 Difference]: Finished difference Result 1153 states and 1968 transitions. [2021-11-07 01:38:54,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:38:54,974 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 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 61 [2021-11-07 01:38:54,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:54,981 INFO L225 Difference]: With dead ends: 1153 [2021-11-07 01:38:54,981 INFO L226 Difference]: Without dead ends: 920 [2021-11-07 01:38:54,983 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 118 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 01:38:54,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 920 states. [2021-11-07 01:38:55,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 920 to 687. [2021-11-07 01:38:55,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 687 states, 685 states have (on average 1.748905109489051) internal successors, (1198), 686 states have internal predecessors, (1198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:55,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 687 states to 687 states and 1198 transitions. [2021-11-07 01:38:55,053 INFO L78 Accepts]: Start accepts. Automaton has 687 states and 1198 transitions. Word has length 61 [2021-11-07 01:38:55,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:55,053 INFO L470 AbstractCegarLoop]: Abstraction has 687 states and 1198 transitions. [2021-11-07 01:38:55,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 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 01:38:55,054 INFO L276 IsEmpty]: Start isEmpty. Operand 687 states and 1198 transitions. [2021-11-07 01:38:55,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 01:38:55,056 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:55,057 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:38:55,075 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-07 01:38:55,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:55,276 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:55,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:55,277 INFO L85 PathProgramCache]: Analyzing trace with hash -811377208, now seen corresponding path program 1 times [2021-11-07 01:38:55,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:55,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1520638712] [2021-11-07 01:38:55,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:55,278 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:55,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:55,279 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:55,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 01:38:55,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:55,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:38:55,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:56,164 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 01:38:56,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:56,364 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 01:38:56,364 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:56,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1520638712] [2021-11-07 01:38:56,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1520638712] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:56,364 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:56,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:38:56,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990357679] [2021-11-07 01:38:56,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:38:56,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:56,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:38:56,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:38:56,367 INFO L87 Difference]: Start difference. First operand 687 states and 1198 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 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 01:38:56,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:56,482 INFO L93 Difference]: Finished difference Result 1685 states and 2942 transitions. [2021-11-07 01:38:56,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:38:56,483 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 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 73 [2021-11-07 01:38:56,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:56,490 INFO L225 Difference]: With dead ends: 1685 [2021-11-07 01:38:56,491 INFO L226 Difference]: Without dead ends: 1082 [2021-11-07 01:38:56,492 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 143 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 01:38:56,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1082 states. [2021-11-07 01:38:56,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1082 to 849. [2021-11-07 01:38:56,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 847 states have (on average 1.7615112160566706) internal successors, (1492), 848 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:56,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 1492 transitions. [2021-11-07 01:38:56,567 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 1492 transitions. Word has length 73 [2021-11-07 01:38:56,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:56,568 INFO L470 AbstractCegarLoop]: Abstraction has 849 states and 1492 transitions. [2021-11-07 01:38:56,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 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 01:38:56,568 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 1492 transitions. [2021-11-07 01:38:56,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:38:56,582 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:56,582 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:38:56,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:38:56,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:56,803 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:56,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:56,804 INFO L85 PathProgramCache]: Analyzing trace with hash -986091801, now seen corresponding path program 1 times [2021-11-07 01:38:56,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:56,809 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1401097933] [2021-11-07 01:38:56,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:56,811 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:56,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:56,812 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:56,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:38:57,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:57,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:38:57,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:57,637 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 01:38:57,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:57,856 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 01:38:57,857 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:57,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1401097933] [2021-11-07 01:38:57,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1401097933] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:57,857 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:57,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:38:57,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62306793] [2021-11-07 01:38:57,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:38:57,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:57,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:38:57,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:38:57,860 INFO L87 Difference]: Start difference. First operand 849 states and 1492 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:57,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:57,999 INFO L93 Difference]: Finished difference Result 2215 states and 3910 transitions. [2021-11-07 01:38:58,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:38:58,000 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 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 74 [2021-11-07 01:38:58,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:58,012 INFO L225 Difference]: With dead ends: 2215 [2021-11-07 01:38:58,012 INFO L226 Difference]: Without dead ends: 1454 [2021-11-07 01:38:58,016 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 145 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 01:38:58,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1454 states. [2021-11-07 01:38:58,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1454 to 1221. [2021-11-07 01:38:58,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1221 states, 1219 states have (on average 1.7801476620180476) internal successors, (2170), 1220 states have internal predecessors, (2170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:58,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1221 states to 1221 states and 2170 transitions. [2021-11-07 01:38:58,165 INFO L78 Accepts]: Start accepts. Automaton has 1221 states and 2170 transitions. Word has length 74 [2021-11-07 01:38:58,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:58,168 INFO L470 AbstractCegarLoop]: Abstraction has 1221 states and 2170 transitions. [2021-11-07 01:38:58,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:58,168 INFO L276 IsEmpty]: Start isEmpty. Operand 1221 states and 2170 transitions. [2021-11-07 01:38:58,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 01:38:58,179 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:58,180 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:38:58,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:38:58,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:58,396 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:58,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:58,397 INFO L85 PathProgramCache]: Analyzing trace with hash 133756823, now seen corresponding path program 1 times [2021-11-07 01:38:58,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:58,397 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2009480646] [2021-11-07 01:38:58,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:58,398 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:58,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:58,398 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:58,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 01:38:58,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:38:58,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 535 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:38:58,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:38:59,200 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 01:38:59,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:38:59,413 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 01:38:59,413 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:38:59,416 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2009480646] [2021-11-07 01:38:59,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2009480646] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:38:59,417 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:38:59,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:38:59,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694800016] [2021-11-07 01:38:59,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:38:59,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:38:59,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:38:59,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:38:59,421 INFO L87 Difference]: Start difference. First operand 1221 states and 2170 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:59,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:38:59,579 INFO L93 Difference]: Finished difference Result 2429 states and 4298 transitions. [2021-11-07 01:38:59,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:38:59,580 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 01:38:59,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:38:59,589 INFO L225 Difference]: With dead ends: 2429 [2021-11-07 01:38:59,590 INFO L226 Difference]: Without dead ends: 1454 [2021-11-07 01:38:59,594 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 146 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 01:38:59,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1454 states. [2021-11-07 01:38:59,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1454 to 1221. [2021-11-07 01:38:59,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1221 states, 1219 states have (on average 1.77850697292863) internal successors, (2168), 1220 states have internal predecessors, (2168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:59,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1221 states to 1221 states and 2168 transitions. [2021-11-07 01:38:59,699 INFO L78 Accepts]: Start accepts. Automaton has 1221 states and 2168 transitions. Word has length 75 [2021-11-07 01:38:59,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:38:59,699 INFO L470 AbstractCegarLoop]: Abstraction has 1221 states and 2168 transitions. [2021-11-07 01:38:59,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:38:59,700 INFO L276 IsEmpty]: Start isEmpty. Operand 1221 states and 2168 transitions. [2021-11-07 01:38:59,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 01:38:59,703 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:38:59,703 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:38:59,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:38:59,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:38:59,916 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:38:59,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:38:59,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1826805642, now seen corresponding path program 1 times [2021-11-07 01:38:59,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:38:59,917 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2075886637] [2021-11-07 01:38:59,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:38:59,917 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:38:59,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:38:59,918 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:38:59,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 01:39:00,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:00,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:39:00,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:00,690 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 01:39:00,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:00,860 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 01:39:00,860 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:00,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2075886637] [2021-11-07 01:39:00,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2075886637] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:00,861 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:39:00,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:39:00,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191700056] [2021-11-07 01:39:00,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:39:00,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:00,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:39:00,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:39:00,862 INFO L87 Difference]: Start difference. First operand 1221 states and 2168 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:01,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:39:01,049 INFO L93 Difference]: Finished difference Result 3303 states and 5893 transitions. [2021-11-07 01:39:01,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:39:01,050 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 01:39:01,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:39:01,065 INFO L225 Difference]: With dead ends: 3303 [2021-11-07 01:39:01,065 INFO L226 Difference]: Without dead ends: 2178 [2021-11-07 01:39:01,068 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 147 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 01:39:01,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2178 states. [2021-11-07 01:39:01,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2178 to 1945. [2021-11-07 01:39:01,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1945 states, 1943 states have (on average 1.7946474523932063) internal successors, (3487), 1944 states have internal predecessors, (3487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:01,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1945 states to 1945 states and 3487 transitions. [2021-11-07 01:39:01,259 INFO L78 Accepts]: Start accepts. Automaton has 1945 states and 3487 transitions. Word has length 75 [2021-11-07 01:39:01,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:39:01,260 INFO L470 AbstractCegarLoop]: Abstraction has 1945 states and 3487 transitions. [2021-11-07 01:39:01,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:01,260 INFO L276 IsEmpty]: Start isEmpty. Operand 1945 states and 3487 transitions. [2021-11-07 01:39:01,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 01:39:01,266 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:39:01,266 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:39:01,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:39:01,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:39:01,485 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:39:01,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:39:01,485 INFO L85 PathProgramCache]: Analyzing trace with hash 1057825577, now seen corresponding path program 1 times [2021-11-07 01:39:01,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:39:01,486 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [561753916] [2021-11-07 01:39:01,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:01,487 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:39:01,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:39:01,488 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:39:01,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 01:39:02,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:02,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:39:02,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:02,362 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 01:39:02,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:02,586 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 01:39:02,587 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:02,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [561753916] [2021-11-07 01:39:02,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [561753916] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:02,587 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:39:02,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:39:02,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54882065] [2021-11-07 01:39:02,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:39:02,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:02,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:39:02,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:39:02,591 INFO L87 Difference]: Start difference. First operand 1945 states and 3487 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:02,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:39:02,879 INFO L93 Difference]: Finished difference Result 5211 states and 9369 transitions. [2021-11-07 01:39:02,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:39:02,880 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 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 76 [2021-11-07 01:39:02,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:39:02,906 INFO L225 Difference]: With dead ends: 5211 [2021-11-07 01:39:02,907 INFO L226 Difference]: Without dead ends: 3396 [2021-11-07 01:39:02,911 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 149 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 01:39:02,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3396 states. [2021-11-07 01:39:03,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3396 to 3163. [2021-11-07 01:39:03,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3163 states, 3161 states have (on average 1.8032268269534957) internal successors, (5700), 3162 states have internal predecessors, (5700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:03,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3163 states to 3163 states and 5700 transitions. [2021-11-07 01:39:03,186 INFO L78 Accepts]: Start accepts. Automaton has 3163 states and 5700 transitions. Word has length 76 [2021-11-07 01:39:03,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:39:03,186 INFO L470 AbstractCegarLoop]: Abstraction has 3163 states and 5700 transitions. [2021-11-07 01:39:03,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:03,187 INFO L276 IsEmpty]: Start isEmpty. Operand 3163 states and 5700 transitions. [2021-11-07 01:39:03,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-07 01:39:03,194 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:39:03,194 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:39:03,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:39:03,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:39:03,412 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:39:03,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:39:03,413 INFO L85 PathProgramCache]: Analyzing trace with hash 79927239, now seen corresponding path program 1 times [2021-11-07 01:39:03,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:39:03,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [141541127] [2021-11-07 01:39:03,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:03,414 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:39:03,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:39:03,414 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:39:03,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 01:39:04,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:04,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 535 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:39:04,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:04,327 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 01:39:04,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:04,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:39:04,590 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:04,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [141541127] [2021-11-07 01:39:04,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [141541127] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:04,591 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:39:04,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:39:04,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138607013] [2021-11-07 01:39:04,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:39:04,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:04,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:39:04,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:39:04,594 INFO L87 Difference]: Start difference. First operand 3163 states and 5700 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:05,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:39:05,017 INFO L93 Difference]: Finished difference Result 8581 states and 15491 transitions. [2021-11-07 01:39:05,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:39:05,017 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 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 77 [2021-11-07 01:39:05,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:39:05,059 INFO L225 Difference]: With dead ends: 8581 [2021-11-07 01:39:05,059 INFO L226 Difference]: Without dead ends: 5582 [2021-11-07 01:39:05,064 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 151 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 01:39:05,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5582 states. [2021-11-07 01:39:05,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5582 to 5349. [2021-11-07 01:39:05,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5349 states, 5347 states have (on average 1.8068075556386758) internal successors, (9661), 5348 states have internal predecessors, (9661), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:05,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5349 states to 5349 states and 9661 transitions. [2021-11-07 01:39:05,593 INFO L78 Accepts]: Start accepts. Automaton has 5349 states and 9661 transitions. Word has length 77 [2021-11-07 01:39:05,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:39:05,594 INFO L470 AbstractCegarLoop]: Abstraction has 5349 states and 9661 transitions. [2021-11-07 01:39:05,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:05,594 INFO L276 IsEmpty]: Start isEmpty. Operand 5349 states and 9661 transitions. [2021-11-07 01:39:05,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 01:39:05,604 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:39:05,604 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] [2021-11-07 01:39:05,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:39:05,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:39:05,823 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:39:05,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:39:05,824 INFO L85 PathProgramCache]: Analyzing trace with hash 1098546155, now seen corresponding path program 1 times [2021-11-07 01:39:05,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:39:05,824 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [222377890] [2021-11-07 01:39:05,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:05,825 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:39:05,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:39:05,826 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:39:05,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 01:39:06,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:06,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:39:06,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:06,936 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 01:39:06,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:07,215 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 01:39:07,216 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:07,216 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [222377890] [2021-11-07 01:39:07,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [222377890] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:07,216 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:39:07,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:39:07,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668178573] [2021-11-07 01:39:07,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:39:07,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:07,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:39:07,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:39:07,219 INFO L87 Difference]: Start difference. First operand 5349 states and 9661 transitions. Second operand has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:10,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:39:10,467 INFO L93 Difference]: Finished difference Result 20036 states and 36225 transitions. [2021-11-07 01:39:10,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:39:10,468 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 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 78 [2021-11-07 01:39:10,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:39:10,558 INFO L225 Difference]: With dead ends: 20036 [2021-11-07 01:39:10,558 INFO L226 Difference]: Without dead ends: 14931 [2021-11-07 01:39:10,569 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 150 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 01:39:10,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14931 states. [2021-11-07 01:39:11,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14931 to 5299. [2021-11-07 01:39:11,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5299 states, 5297 states have (on average 1.7861053426467812) internal successors, (9461), 5298 states have internal predecessors, (9461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:11,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5299 states to 5299 states and 9461 transitions. [2021-11-07 01:39:11,236 INFO L78 Accepts]: Start accepts. Automaton has 5299 states and 9461 transitions. Word has length 78 [2021-11-07 01:39:11,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:39:11,236 INFO L470 AbstractCegarLoop]: Abstraction has 5299 states and 9461 transitions. [2021-11-07 01:39:11,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:11,237 INFO L276 IsEmpty]: Start isEmpty. Operand 5299 states and 9461 transitions. [2021-11-07 01:39:11,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 01:39:11,246 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:39:11,246 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:39:11,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:39:11,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:39:11,468 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:39:11,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:39:11,468 INFO L85 PathProgramCache]: Analyzing trace with hash -1547626342, now seen corresponding path program 1 times [2021-11-07 01:39:11,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:39:11,469 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1949561061] [2021-11-07 01:39:11,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:11,469 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:39:11,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:39:11,470 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:39:11,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:39:12,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:12,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:39:12,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:12,391 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 01:39:12,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:12,592 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 01:39:12,592 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:12,592 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1949561061] [2021-11-07 01:39:12,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1949561061] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:12,592 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:39:12,593 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:39:12,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83448659] [2021-11-07 01:39:12,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:39:12,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:12,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:39:12,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:39:12,594 INFO L87 Difference]: Start difference. First operand 5299 states and 9461 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:13,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:39:13,188 INFO L93 Difference]: Finished difference Result 15318 states and 27397 transitions. [2021-11-07 01:39:13,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:39:13,189 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 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 78 [2021-11-07 01:39:13,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:39:13,222 INFO L225 Difference]: With dead ends: 15318 [2021-11-07 01:39:13,223 INFO L226 Difference]: Without dead ends: 10190 [2021-11-07 01:39:13,232 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 153 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 01:39:13,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10190 states. [2021-11-07 01:39:14,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10190 to 9957. [2021-11-07 01:39:14,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9957 states, 9955 states have (on average 1.7878453038674034) internal successors, (17798), 9956 states have internal predecessors, (17798), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:14,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9957 states to 9957 states and 17798 transitions. [2021-11-07 01:39:14,051 INFO L78 Accepts]: Start accepts. Automaton has 9957 states and 17798 transitions. Word has length 78 [2021-11-07 01:39:14,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:39:14,052 INFO L470 AbstractCegarLoop]: Abstraction has 9957 states and 17798 transitions. [2021-11-07 01:39:14,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:14,052 INFO L276 IsEmpty]: Start isEmpty. Operand 9957 states and 17798 transitions. [2021-11-07 01:39:14,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:39:14,064 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:39:14,064 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] [2021-11-07 01:39:14,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 01:39:14,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:39:14,278 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:39:14,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:39:14,279 INFO L85 PathProgramCache]: Analyzing trace with hash 2016774822, now seen corresponding path program 1 times [2021-11-07 01:39:14,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:39:14,279 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [260432464] [2021-11-07 01:39:14,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:14,280 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:39:14,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:39:14,280 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:39:14,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 01:39:15,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:15,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:39:15,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:15,299 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 01:39:15,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:15,568 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 01:39:15,569 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:15,569 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [260432464] [2021-11-07 01:39:15,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [260432464] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:39:15,569 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [805749140] [2021-11-07 01:39:15,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:15,570 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:39:15,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:39:15,572 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:39:15,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 01:39:16,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:16,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:39:16,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:17,046 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 01:39:17,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:17,398 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 01:39:17,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [805749140] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:17,398 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:39:17,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 01:39:17,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801812011] [2021-11-07 01:39:17,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:39:17,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:17,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:39:17,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:39:17,401 INFO L87 Difference]: Start difference. First operand 9957 states and 17798 transitions. Second operand has 10 states, 10 states have (on average 11.4) internal successors, (114), 10 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:25,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:39:25,699 INFO L93 Difference]: Finished difference Result 60388 states and 108212 transitions. [2021-11-07 01:39:25,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 01:39:25,700 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 11.4) internal successors, (114), 10 states have internal predecessors, (114), 0 states have call successors, (0), 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 79 [2021-11-07 01:39:25,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:39:25,905 INFO L225 Difference]: With dead ends: 60388 [2021-11-07 01:39:25,905 INFO L226 Difference]: Without dead ends: 60173 [2021-11-07 01:39:25,921 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 01:39:25,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60173 states. [2021-11-07 01:39:27,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60173 to 19846. [2021-11-07 01:39:27,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19846 states, 19844 states have (on average 1.788248337028825) internal successors, (35486), 19845 states have internal predecessors, (35486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:27,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19846 states to 19846 states and 35486 transitions. [2021-11-07 01:39:27,949 INFO L78 Accepts]: Start accepts. Automaton has 19846 states and 35486 transitions. Word has length 79 [2021-11-07 01:39:27,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:39:27,950 INFO L470 AbstractCegarLoop]: Abstraction has 19846 states and 35486 transitions. [2021-11-07 01:39:27,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 11.4) internal successors, (114), 10 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:27,951 INFO L276 IsEmpty]: Start isEmpty. Operand 19846 states and 35486 transitions. [2021-11-07 01:39:27,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 01:39:27,977 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:39:27,977 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] [2021-11-07 01:39:28,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 01:39:28,196 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-07 01:39:28,392 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:39:28,392 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:39:28,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:39:28,393 INFO L85 PathProgramCache]: Analyzing trace with hash 1770811055, now seen corresponding path program 1 times [2021-11-07 01:39:28,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:39:28,393 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [8660748] [2021-11-07 01:39:28,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:28,393 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:39:28,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:39:28,396 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:39:28,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:39:29,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:29,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:39:29,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:29,556 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 01:39:29,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:29,839 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 01:39:29,839 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:29,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [8660748] [2021-11-07 01:39:29,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [8660748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:39:29,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [645063627] [2021-11-07 01:39:29,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:29,840 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:39:29,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:39:29,841 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:39:29,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:39:31,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:31,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:39:31,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:31,311 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 01:39:31,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:31,584 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 01:39:31,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [645063627] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:31,584 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:39:31,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 01:39:31,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243029172] [2021-11-07 01:39:31,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:39:31,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:31,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:39:31,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:39:31,587 INFO L87 Difference]: Start difference. First operand 19846 states and 35486 transitions. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:34,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:39:34,837 INFO L93 Difference]: Finished difference Result 20509 states and 36569 transitions. [2021-11-07 01:39:34,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:39:34,852 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 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 80 [2021-11-07 01:39:34,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:39:34,912 INFO L225 Difference]: With dead ends: 20509 [2021-11-07 01:39:34,913 INFO L226 Difference]: Without dead ends: 20119 [2021-11-07 01:39:34,919 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 307 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 01:39:34,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20119 states. [2021-11-07 01:39:36,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20119 to 19840. [2021-11-07 01:39:36,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19840 states, 19838 states have (on average 1.7881338844641597) internal successors, (35473), 19839 states have internal predecessors, (35473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:36,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19840 states to 19840 states and 35473 transitions. [2021-11-07 01:39:36,523 INFO L78 Accepts]: Start accepts. Automaton has 19840 states and 35473 transitions. Word has length 80 [2021-11-07 01:39:36,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:39:36,523 INFO L470 AbstractCegarLoop]: Abstraction has 19840 states and 35473 transitions. [2021-11-07 01:39:36,524 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:36,524 INFO L276 IsEmpty]: Start isEmpty. Operand 19840 states and 35473 transitions. [2021-11-07 01:39:36,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 01:39:36,552 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:39:36,552 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] [2021-11-07 01:39:36,558 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2021-11-07 01:39:36,768 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-07 01:39:36,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:39:36,959 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:39:36,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:39:36,959 INFO L85 PathProgramCache]: Analyzing trace with hash 1287575257, now seen corresponding path program 1 times [2021-11-07 01:39:36,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:39:36,960 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1831806527] [2021-11-07 01:39:36,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:36,961 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:39:36,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:39:36,964 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:39:36,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 01:39:37,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:38,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:39:38,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:38,207 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 01:39:38,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:38,430 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 01:39:38,431 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:38,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1831806527] [2021-11-07 01:39:38,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1831806527] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:38,431 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:39:38,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 01:39:38,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372254983] [2021-11-07 01:39:38,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:39:38,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:38,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:39:38,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:39:38,434 INFO L87 Difference]: Start difference. First operand 19840 states and 35473 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:39,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:39:39,850 INFO L93 Difference]: Finished difference Result 38776 states and 69551 transitions. [2021-11-07 01:39:39,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:39:39,851 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 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 80 [2021-11-07 01:39:39,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:39:39,895 INFO L225 Difference]: With dead ends: 38776 [2021-11-07 01:39:39,896 INFO L226 Difference]: Without dead ends: 19183 [2021-11-07 01:39:39,920 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 156 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 01:39:39,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19183 states. [2021-11-07 01:39:40,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19183 to 9955. [2021-11-07 01:39:40,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9955 states, 9953 states have (on average 1.7873003114638801) internal successors, (17789), 9954 states have internal predecessors, (17789), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:40,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9955 states to 9955 states and 17789 transitions. [2021-11-07 01:39:40,673 INFO L78 Accepts]: Start accepts. Automaton has 9955 states and 17789 transitions. Word has length 80 [2021-11-07 01:39:40,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:39:40,673 INFO L470 AbstractCegarLoop]: Abstraction has 9955 states and 17789 transitions. [2021-11-07 01:39:40,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:39:40,674 INFO L276 IsEmpty]: Start isEmpty. Operand 9955 states and 17789 transitions. [2021-11-07 01:39:40,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-07 01:39:40,684 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:39:40,684 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] [2021-11-07 01:39:40,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:39:40,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:39:40,903 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:39:40,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:39:40,904 INFO L85 PathProgramCache]: Analyzing trace with hash -653724195, now seen corresponding path program 1 times [2021-11-07 01:39:40,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:39:40,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1533366909] [2021-11-07 01:39:40,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:40,905 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:39:40,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:39:40,905 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:39:40,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 01:39:41,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:41,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:39:41,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:42,127 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 01:39:42,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:42,379 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 01:39:42,379 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:39:42,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1533366909] [2021-11-07 01:39:42,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1533366909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:39:42,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [906742422] [2021-11-07 01:39:42,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:39:42,380 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:39:42,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:39:42,381 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:39:42,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 01:39:43,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:39:43,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:39:43,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:39:44,563 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 01:39:44,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:39:45,070 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 01:39:45,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [906742422] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:39:45,071 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:39:45,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:39:45,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129047817] [2021-11-07 01:39:45,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:39:45,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:39:45,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:39:45,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:39:45,075 INFO L87 Difference]: Start difference. First operand 9955 states and 17789 transitions. Second operand has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:00,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:40:00,918 INFO L93 Difference]: Finished difference Result 22222 states and 39205 transitions. [2021-11-07 01:40:00,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 01:40:00,919 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-07 01:40:00,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:40:00,950 INFO L225 Difference]: With dead ends: 22222 [2021-11-07 01:40:00,950 INFO L226 Difference]: Without dead ends: 22018 [2021-11-07 01:40:00,955 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 01:40:00,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22018 states. [2021-11-07 01:40:02,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22018 to 19824. [2021-11-07 01:40:02,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19824 states, 19822 states have (on average 1.788215114519221) internal successors, (35446), 19823 states have internal predecessors, (35446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:02,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19824 states to 19824 states and 35446 transitions. [2021-11-07 01:40:02,390 INFO L78 Accepts]: Start accepts. Automaton has 19824 states and 35446 transitions. Word has length 82 [2021-11-07 01:40:02,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:40:02,390 INFO L470 AbstractCegarLoop]: Abstraction has 19824 states and 35446 transitions. [2021-11-07 01:40:02,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:02,390 INFO L276 IsEmpty]: Start isEmpty. Operand 19824 states and 35446 transitions. [2021-11-07 01:40:02,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 01:40:02,406 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:40:02,406 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] [2021-11-07 01:40:02,415 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 0 [2021-11-07 01:40:02,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-11-07 01:40:02,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:40:02,812 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:40:02,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:40:02,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1490109144, now seen corresponding path program 1 times [2021-11-07 01:40:02,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:40:02,813 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2044817251] [2021-11-07 01:40:02,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:40:02,813 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:40:02,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:40:02,814 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:40:02,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 01:40:03,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:40:03,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:40:03,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:40:04,150 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 01:40:04,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:40:04,409 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 01:40:04,409 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:40:04,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2044817251] [2021-11-07 01:40:04,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2044817251] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:40:04,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [457973850] [2021-11-07 01:40:04,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:40:04,410 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:40:04,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:40:04,411 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:40:04,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 01:40:05,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:40:05,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:40:05,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:40:06,235 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 01:40:06,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:40:06,543 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 01:40:06,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [457973850] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:40:06,545 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:40:06,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 01:40:06,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726920862] [2021-11-07 01:40:06,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:40:06,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:40:06,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:40:06,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:40:06,548 INFO L87 Difference]: Start difference. First operand 19824 states and 35446 transitions. Second operand has 7 states, 7 states have (on average 11.0) internal successors, (77), 7 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:10,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:40:10,472 INFO L93 Difference]: Finished difference Result 20492 states and 36530 transitions. [2021-11-07 01:40:10,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 01:40:10,472 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.0) internal successors, (77), 7 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-07 01:40:10,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:40:10,502 INFO L225 Difference]: With dead ends: 20492 [2021-11-07 01:40:10,502 INFO L226 Difference]: Without dead ends: 20012 [2021-11-07 01:40:10,508 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 317 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 01:40:10,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20012 states. [2021-11-07 01:40:11,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20012 to 19806. [2021-11-07 01:40:11,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19806 states, 19804 states have (on average 1.787820642294486) internal successors, (35406), 19805 states have internal predecessors, (35406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:11,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19806 states to 19806 states and 35406 transitions. [2021-11-07 01:40:11,658 INFO L78 Accepts]: Start accepts. Automaton has 19806 states and 35406 transitions. Word has length 83 [2021-11-07 01:40:11,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:40:11,658 INFO L470 AbstractCegarLoop]: Abstraction has 19806 states and 35406 transitions. [2021-11-07 01:40:11,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.0) internal successors, (77), 7 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:11,659 INFO L276 IsEmpty]: Start isEmpty. Operand 19806 states and 35406 transitions. [2021-11-07 01:40:11,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 01:40:11,677 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:40:11,677 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] [2021-11-07 01:40:11,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:40:11,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:40:12,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:40:12,092 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:40:12,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:40:12,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1726605824, now seen corresponding path program 1 times [2021-11-07 01:40:12,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:40:12,094 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1930416613] [2021-11-07 01:40:12,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:40:12,094 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:40:12,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:40:12,095 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:40:12,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 01:40:13,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:40:13,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:40:13,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:40:13,535 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 01:40:13,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:40:13,786 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 01:40:13,786 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:40:13,786 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1930416613] [2021-11-07 01:40:13,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1930416613] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:40:13,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1472342152] [2021-11-07 01:40:13,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:40:13,787 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:40:13,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:40:13,788 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:40:13,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 01:40:15,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:40:15,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:40:15,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:40:15,995 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 01:40:15,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:40:16,451 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 01:40:16,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1472342152] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:40:16,452 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:40:16,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:40:16,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488850920] [2021-11-07 01:40:16,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:40:16,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:40:16,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:40:16,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:40:16,454 INFO L87 Difference]: Start difference. First operand 19806 states and 35406 transitions. Second operand has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:37,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:40:37,540 INFO L93 Difference]: Finished difference Result 43399 states and 76754 transitions. [2021-11-07 01:40:37,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 01:40:37,541 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-07 01:40:37,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:40:37,610 INFO L225 Difference]: With dead ends: 43399 [2021-11-07 01:40:37,610 INFO L226 Difference]: Without dead ends: 43037 [2021-11-07 01:40:37,620 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 01:40:37,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43037 states. [2021-11-07 01:40:40,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43037 to 39439. [2021-11-07 01:40:40,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39439 states, 39437 states have (on average 1.7882698988259755) internal successors, (70524), 39438 states have internal predecessors, (70524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:40,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39439 states to 39439 states and 70524 transitions. [2021-11-07 01:40:40,515 INFO L78 Accepts]: Start accepts. Automaton has 39439 states and 70524 transitions. Word has length 83 [2021-11-07 01:40:40,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:40:40,515 INFO L470 AbstractCegarLoop]: Abstraction has 39439 states and 70524 transitions. [2021-11-07 01:40:40,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:40,516 INFO L276 IsEmpty]: Start isEmpty. Operand 39439 states and 70524 transitions. [2021-11-07 01:40:40,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 01:40:40,539 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:40:40,539 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] [2021-11-07 01:40:40,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:40:40,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:40:40,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:40:40,940 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:40:40,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:40:40,940 INFO L85 PathProgramCache]: Analyzing trace with hash -1507751106, now seen corresponding path program 1 times [2021-11-07 01:40:40,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:40:40,941 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [88855366] [2021-11-07 01:40:40,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:40:40,941 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:40:40,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:40:40,942 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:40:40,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 01:40:42,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:40:42,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:40:42,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:40:42,603 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 01:40:42,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:40:42,925 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 01:40:42,926 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:40:42,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [88855366] [2021-11-07 01:40:42,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [88855366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:40:42,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [527413933] [2021-11-07 01:40:42,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:40:42,926 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:40:42,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:40:42,928 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:40:42,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 01:40:44,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:40:44,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:40:44,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:40:44,989 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 01:40:44,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:40:45,389 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 01:40:45,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [527413933] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:40:45,389 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:40:45,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 14 [2021-11-07 01:40:45,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785919689] [2021-11-07 01:40:45,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:40:45,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:40:45,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:40:45,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-11-07 01:40:45,391 INFO L87 Difference]: Start difference. First operand 39439 states and 70524 transitions. Second operand has 8 states, 8 states have (on average 18.25) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:51,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:40:51,804 INFO L93 Difference]: Finished difference Result 47963 states and 84498 transitions. [2021-11-07 01:40:51,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 01:40:51,804 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 18.25) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-07 01:40:51,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:40:51,878 INFO L225 Difference]: With dead ends: 47963 [2021-11-07 01:40:51,878 INFO L226 Difference]: Without dead ends: 47129 [2021-11-07 01:40:51,887 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-11-07 01:40:51,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47129 states. [2021-11-07 01:40:55,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47129 to 40431. [2021-11-07 01:40:55,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40431 states, 40429 states have (on average 1.7843132404956838) internal successors, (72138), 40430 states have internal predecessors, (72138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:55,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40431 states to 40431 states and 72138 transitions. [2021-11-07 01:40:55,173 INFO L78 Accepts]: Start accepts. Automaton has 40431 states and 72138 transitions. Word has length 83 [2021-11-07 01:40:55,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:40:55,173 INFO L470 AbstractCegarLoop]: Abstraction has 40431 states and 72138 transitions. [2021-11-07 01:40:55,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 18.25) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:40:55,173 INFO L276 IsEmpty]: Start isEmpty. Operand 40431 states and 72138 transitions. [2021-11-07 01:40:55,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-07 01:40:55,192 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:40:55,192 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] [2021-11-07 01:40:55,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:40:55,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:40:55,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:40:55,593 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:40:55,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:40:55,595 INFO L85 PathProgramCache]: Analyzing trace with hash 603157891, now seen corresponding path program 1 times [2021-11-07 01:40:55,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:40:55,596 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2048781317] [2021-11-07 01:40:55,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:40:55,596 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:40:55,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:40:55,598 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:40:55,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 01:40:56,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:40:57,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:40:57,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:40:57,285 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:40:57,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:40:57,549 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 01:40:57,549 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:40:57,549 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2048781317] [2021-11-07 01:40:57,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2048781317] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:40:57,549 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [802288939] [2021-11-07 01:40:57,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:40:57,550 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:40:57,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:40:57,560 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:40:57,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 01:40:59,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:40:59,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-07 01:40:59,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:40:59,649 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 01:40:59,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:40:59,869 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 01:40:59,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [802288939] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:40:59,869 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:40:59,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 14 [2021-11-07 01:40:59,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007841091] [2021-11-07 01:40:59,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:40:59,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:40:59,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:40:59,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-11-07 01:40:59,871 INFO L87 Difference]: Start difference. First operand 40431 states and 72138 transitions. Second operand has 8 states, 8 states have (on average 9.75) internal successors, (78), 8 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:03,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:41:03,476 INFO L93 Difference]: Finished difference Result 43335 states and 76881 transitions. [2021-11-07 01:41:03,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 01:41:03,479 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.75) internal successors, (78), 8 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-07 01:41:03,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:41:03,650 INFO L225 Difference]: With dead ends: 43335 [2021-11-07 01:41:03,650 INFO L226 Difference]: Without dead ends: 41539 [2021-11-07 01:41:03,659 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:41:03,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41539 states. [2021-11-07 01:41:06,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41539 to 40256. [2021-11-07 01:41:06,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40256 states, 40254 states have (on average 1.7847667312565212) internal successors, (71844), 40255 states have internal predecessors, (71844), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:06,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40256 states to 40256 states and 71844 transitions. [2021-11-07 01:41:06,842 INFO L78 Accepts]: Start accepts. Automaton has 40256 states and 71844 transitions. Word has length 84 [2021-11-07 01:41:06,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:41:06,842 INFO L470 AbstractCegarLoop]: Abstraction has 40256 states and 71844 transitions. [2021-11-07 01:41:06,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 9.75) internal successors, (78), 8 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:06,842 INFO L276 IsEmpty]: Start isEmpty. Operand 40256 states and 71844 transitions. [2021-11-07 01:41:06,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 01:41:06,867 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:41:06,867 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:41:06,889 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:41:07,090 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-07 01:41:07,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:41:07,276 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:41:07,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:41:07,276 INFO L85 PathProgramCache]: Analyzing trace with hash 474826417, now seen corresponding path program 1 times [2021-11-07 01:41:07,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:41:07,277 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1767641176] [2021-11-07 01:41:07,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:41:07,278 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:41:07,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:41:07,279 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:41:07,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:41:08,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:41:08,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:41:08,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:41:09,267 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 01:41:09,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:41:09,571 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 01:41:09,571 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:41:09,571 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1767641176] [2021-11-07 01:41:09,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1767641176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:41:09,571 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1660031875] [2021-11-07 01:41:09,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:41:09,571 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:41:09,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:41:09,572 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:41:09,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:41:11,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:41:11,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:41:11,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:41:11,721 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 01:41:11,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:41:11,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:41:11,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1660031875] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:41:11,899 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:41:11,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:41:11,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474253866] [2021-11-07 01:41:11,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:41:11,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:41:11,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:41:11,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:41:11,900 INFO L87 Difference]: Start difference. First operand 40256 states and 71844 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:15,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:41:15,657 INFO L93 Difference]: Finished difference Result 45378 states and 80104 transitions. [2021-11-07 01:41:15,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:41:15,657 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 01:41:15,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:41:15,729 INFO L225 Difference]: With dead ends: 45378 [2021-11-07 01:41:15,729 INFO L226 Difference]: Without dead ends: 43596 [2021-11-07 01:41:15,738 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 332 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 01:41:15,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43596 states. [2021-11-07 01:41:18,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43596 to 40274. [2021-11-07 01:41:18,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40274 states, 40272 states have (on average 1.7844159713945174) internal successors, (71862), 40273 states have internal predecessors, (71862), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:18,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40274 states to 40274 states and 71862 transitions. [2021-11-07 01:41:18,718 INFO L78 Accepts]: Start accepts. Automaton has 40274 states and 71862 transitions. Word has length 86 [2021-11-07 01:41:18,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:41:18,719 INFO L470 AbstractCegarLoop]: Abstraction has 40274 states and 71862 transitions. [2021-11-07 01:41:18,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:18,719 INFO L276 IsEmpty]: Start isEmpty. Operand 40274 states and 71862 transitions. [2021-11-07 01:41:18,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 01:41:18,747 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:41:18,747 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:41:18,772 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-11-07 01:41:18,970 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-07 01:41:19,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:41:19,156 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:41:19,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:41:19,157 INFO L85 PathProgramCache]: Analyzing trace with hash 986125328, now seen corresponding path program 1 times [2021-11-07 01:41:19,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:41:19,158 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1452150824] [2021-11-07 01:41:19,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:41:19,158 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:41:19,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:41:19,159 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:41:19,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:41:20,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:41:20,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:41:20,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:41:20,864 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 01:41:20,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:41:21,145 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 01:41:21,145 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:41:21,146 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1452150824] [2021-11-07 01:41:21,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1452150824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:41:21,146 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [546541430] [2021-11-07 01:41:21,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:41:21,146 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:41:21,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:41:21,147 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:41:21,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:41:23,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:41:23,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:41:23,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:41:23,364 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 01:41:23,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:41:23,559 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 01:41:23,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [546541430] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:41:23,559 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:41:23,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:41:23,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514162662] [2021-11-07 01:41:23,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:41:23,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:41:23,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:41:23,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:41:23,561 INFO L87 Difference]: Start difference. First operand 40274 states and 71862 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:27,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:41:27,156 INFO L93 Difference]: Finished difference Result 43542 states and 77196 transitions. [2021-11-07 01:41:27,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:41:27,157 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 01:41:27,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:41:27,222 INFO L225 Difference]: With dead ends: 43542 [2021-11-07 01:41:27,222 INFO L226 Difference]: Without dead ends: 41693 [2021-11-07 01:41:27,230 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 330 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 01:41:27,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41693 states. [2021-11-07 01:41:30,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41693 to 40204. [2021-11-07 01:41:30,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40204 states, 40202 states have (on average 1.7844385851450177) internal successors, (71738), 40203 states have internal predecessors, (71738), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:30,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40204 states to 40204 states and 71738 transitions. [2021-11-07 01:41:30,376 INFO L78 Accepts]: Start accepts. Automaton has 40204 states and 71738 transitions. Word has length 86 [2021-11-07 01:41:30,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:41:30,376 INFO L470 AbstractCegarLoop]: Abstraction has 40204 states and 71738 transitions. [2021-11-07 01:41:30,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:41:30,377 INFO L276 IsEmpty]: Start isEmpty. Operand 40204 states and 71738 transitions. [2021-11-07 01:41:30,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 01:41:30,398 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:41:30,398 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:41:30,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:41:30,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 01:41:30,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:41:30,799 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:41:30,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:41:30,800 INFO L85 PathProgramCache]: Analyzing trace with hash -579570178, now seen corresponding path program 1 times [2021-11-07 01:41:30,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:41:30,801 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1843863185] [2021-11-07 01:41:30,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:41:30,801 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:41:30,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:41:30,802 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:41:30,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 01:41:32,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:41:32,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:41:32,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:41:32,550 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 01:41:32,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:41:32,816 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 01:41:32,816 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:41:32,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1843863185] [2021-11-07 01:41:32,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1843863185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:41:32,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [794831989] [2021-11-07 01:41:32,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:41:32,817 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:41:32,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:41:32,845 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:41:32,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47220ed8-903c-4b93-b285-09e60a0af083/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 01:41:34,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:41:34,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:41:34,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:41:34,984 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 01:41:34,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:41:35,158 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 01:41:35,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [794831989] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:41:35,159 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:41:35,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:41:35,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252712443] [2021-11-07 01:41:35,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:41:35,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:41:35,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:41:35,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:41:35,161 INFO L87 Difference]: Start difference. First operand 40204 states and 71738 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)