./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/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_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 56160afe0156ee9cb1db810e306de9e54e614e31d545b68546457414a273604d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:23:22,749 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:23:22,753 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:23:22,832 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:23:22,833 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:23:22,838 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:23:22,840 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:23:22,846 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:23:22,849 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:23:22,857 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:23:22,858 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:23:22,861 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:23:22,861 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:23:22,865 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:23:22,868 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:23:22,874 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:23:22,877 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:23:22,878 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:23:22,882 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:23:22,895 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:23:22,899 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:23:22,901 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:23:22,906 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:23:22,907 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:23:22,919 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:23:22,920 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:23:22,920 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:23:22,923 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:23:22,924 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:23:22,926 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:23:22,926 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:23:22,928 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:23:22,931 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:23:22,932 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:23:22,935 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:23:22,935 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:23:22,936 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:23:22,936 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:23:22,937 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:23:22,938 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:23:22,939 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:23:22,940 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-07 02:23:22,996 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:23:22,996 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:23:23,000 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:23:23,001 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:23:23,001 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:23:23,001 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:23:23,001 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:23:23,002 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:23:23,002 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:23:23,002 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:23:23,004 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:23:23,004 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:23:23,004 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:23:23,005 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:23:23,005 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:23:23,007 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-07 02:23:23,007 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-07 02:23:23,007 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:23:23,008 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:23:23,008 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-07 02:23:23,008 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:23:23,009 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:23:23,009 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:23:23,009 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-07 02:23:23,009 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-07 02:23:23,010 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-07 02:23:23,012 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:23:23,012 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:23:23,012 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:23:23,013 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:23:23,013 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:23:23,013 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:23:23,014 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:23:23,014 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:23:23,014 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:23:23,015 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:23:23,015 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:23:23,015 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:23:23,016 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:23:23,016 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_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 56160afe0156ee9cb1db810e306de9e54e614e31d545b68546457414a273604d [2021-11-07 02:23:23,457 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:23:23,487 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:23:23,491 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:23:23,493 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:23:23,494 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:23:23,496 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i [2021-11-07 02:23:23,606 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data/c9cded064/e6d39811090740b7aefac2173ec4def6/FLAGb304dcdb4 [2021-11-07 02:23:24,444 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:23:24,444 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i [2021-11-07 02:23:24,459 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data/c9cded064/e6d39811090740b7aefac2173ec4def6/FLAGb304dcdb4 [2021-11-07 02:23:24,668 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data/c9cded064/e6d39811090740b7aefac2173ec4def6 [2021-11-07 02:23:24,672 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:23:24,674 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:23:24,677 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:23:24,677 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:23:24,694 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:23:24,696 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:23:24" (1/1) ... [2021-11-07 02:23:24,702 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48e87e9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:24, skipping insertion in model container [2021-11-07 02:23:24,703 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:23:24" (1/1) ... [2021-11-07 02:23:24,713 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:23:24,763 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:23:25,228 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:23:25,242 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 02:23:25,243 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@7144bcc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:25, skipping insertion in model container [2021-11-07 02:23:25,244 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:23:25,244 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 02:23:25,248 INFO L168 Benchmark]: Toolchain (without parser) took 571.70 ms. Allocated memory was 90.2 MB in the beginning and 113.2 MB in the end (delta: 23.1 MB). Free memory was 53.4 MB in the beginning and 87.9 MB in the end (delta: -34.5 MB). Peak memory consumption was 7.9 MB. Max. memory is 16.1 GB. [2021-11-07 02:23:25,250 INFO L168 Benchmark]: CDTParser took 0.42 ms. Allocated memory is still 90.2 MB. Free memory was 62.3 MB in the beginning and 62.3 MB in the end (delta: 21.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:23:25,251 INFO L168 Benchmark]: CACSL2BoogieTranslator took 567.74 ms. Allocated memory was 90.2 MB in the beginning and 113.2 MB in the end (delta: 23.1 MB). Free memory was 53.3 MB in the beginning and 87.9 MB in the end (delta: -34.7 MB). Peak memory consumption was 7.9 MB. Max. memory is 16.1 GB. [2021-11-07 02:23:25,255 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.42 ms. Allocated memory is still 90.2 MB. Free memory was 62.3 MB in the beginning and 62.3 MB in the end (delta: 21.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 567.74 ms. Allocated memory was 90.2 MB in the beginning and 113.2 MB in the end (delta: 23.1 MB). Free memory was 53.3 MB in the beginning and 87.9 MB in the end (delta: -34.7 MB). Peak memory consumption was 7.9 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 528]: 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_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/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_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 56160afe0156ee9cb1db810e306de9e54e614e31d545b68546457414a273604d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:23:28,374 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:23:28,377 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:23:28,423 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:23:28,424 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:23:28,430 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:23:28,434 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:23:28,445 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:23:28,450 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:23:28,460 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:23:28,462 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:23:28,463 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:23:28,464 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:23:28,466 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:23:28,468 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:23:28,470 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:23:28,481 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:23:28,482 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:23:28,490 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:23:28,496 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:23:28,499 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:23:28,505 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:23:28,509 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:23:28,513 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:23:28,522 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:23:28,523 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:23:28,523 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:23:28,525 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:23:28,526 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:23:28,527 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:23:28,528 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:23:28,529 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:23:28,531 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:23:28,539 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:23:28,542 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:23:28,543 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:23:28,544 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:23:28,545 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:23:28,545 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:23:28,548 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:23:28,549 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:23:28,551 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-07 02:23:28,613 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:23:28,614 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:23:28,616 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:23:28,616 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:23:28,616 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:23:28,617 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:23:28,617 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:23:28,618 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:23:28,618 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:23:28,620 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-07 02:23:28,621 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-07 02:23:28,622 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:23:28,622 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:23:28,622 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-07 02:23:28,623 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:23:28,623 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:23:28,623 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:23:28,623 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-07 02:23:28,623 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-07 02:23:28,624 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-07 02:23:28,624 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:23:28,624 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:23:28,624 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 02:23:28,625 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 02:23:28,625 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:23:28,625 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:23:28,626 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:23:28,626 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 02:23:28,626 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:23:28,626 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:23:28,627 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:23:28,627 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:23:28,627 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 02:23:28,628 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:28,628 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:23:28,628 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:23:28,628 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_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 56160afe0156ee9cb1db810e306de9e54e614e31d545b68546457414a273604d [2021-11-07 02:23:29,182 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:23:29,221 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:23:29,225 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:23:29,227 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:23:29,228 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:23:29,230 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i [2021-11-07 02:23:29,338 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data/e1b1314fe/2067ebcda1f8468381dc371ad0778a02/FLAGb1e1e63e6 [2021-11-07 02:23:30,128 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:23:30,129 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i [2021-11-07 02:23:30,150 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data/e1b1314fe/2067ebcda1f8468381dc371ad0778a02/FLAGb1e1e63e6 [2021-11-07 02:23:30,337 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/data/e1b1314fe/2067ebcda1f8468381dc371ad0778a02 [2021-11-07 02:23:30,341 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:23:30,343 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:23:30,345 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:23:30,345 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:23:30,350 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:23:30,351 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:23:30" (1/1) ... [2021-11-07 02:23:30,353 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d75d1d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:30, skipping insertion in model container [2021-11-07 02:23:30,353 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:23:30" (1/1) ... [2021-11-07 02:23:30,364 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:23:30,411 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:23:30,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:23:30,829 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 02:23:30,839 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:23:30,900 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:23:30,917 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:23:30,994 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:23:31,036 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:23:31,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31 WrapperNode [2021-11-07 02:23:31,037 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:23:31,039 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:23:31,039 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:23:31,039 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:23:31,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,089 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,147 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:23:31,149 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:23:31,150 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:23:31,150 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:23:31,162 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,187 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,188 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,197 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,217 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,220 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,223 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:23:31,229 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:23:31,230 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:23:31,230 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:23:31,231 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (1/1) ... [2021-11-07 02:23:31,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:23:31,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:23:31,278 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:23:31,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:23:31,354 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-07 02:23:31,355 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:23:31,355 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-07 02:23:31,355 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-07 02:23:31,355 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:23:31,355 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:23:32,099 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:23:32,099 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-07 02:23:32,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:23:32 BoogieIcfgContainer [2021-11-07 02:23:32,103 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:23:32,105 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:23:32,106 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:23:32,110 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:23:32,110 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:23:30" (1/3) ... [2021-11-07 02:23:32,111 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bdaaaad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:23:32, skipping insertion in model container [2021-11-07 02:23:32,112 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:23:31" (2/3) ... [2021-11-07 02:23:32,112 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bdaaaad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:23:32, skipping insertion in model container [2021-11-07 02:23:32,113 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:23:32" (3/3) ... [2021-11-07 02:23:32,115 INFO L111 eAbstractionObserver]: Analyzing ICFG insertionsort-alloca-1.i [2021-11-07 02:23:32,122 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:23:32,123 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2021-11-07 02:23:32,186 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:23:32,194 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 02:23:32,195 INFO L340 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2021-11-07 02:23:32,215 INFO L276 IsEmpty]: Start isEmpty. Operand has 40 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:32,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 02:23:32,224 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:32,225 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 02:23:32,226 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:32,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:32,235 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-11-07 02:23:32,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:32,250 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [542793569] [2021-11-07 02:23:32,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:32,252 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:32,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:32,259 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:32,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 02:23:32,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:32,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:23:32,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:32,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-07 02:23:32,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:32,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:32,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:32,620 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:32,620 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [542793569] [2021-11-07 02:23:32,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [542793569] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:32,622 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:23:32,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 02:23:32,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101892844] [2021-11-07 02:23:32,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:23:32,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:32,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:23:32,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:23:32,665 INFO L87 Difference]: Start difference. First operand has 40 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 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 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:32,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:32,834 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-11-07 02:23:32,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:23:32,840 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-07 02:23:32,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:32,852 INFO L225 Difference]: With dead ends: 39 [2021-11-07 02:23:32,852 INFO L226 Difference]: Without dead ends: 37 [2021-11-07 02:23:32,854 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:23:32,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-07 02:23:32,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-07 02:23:32,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 25 states have (on average 1.64) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:32,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-07 02:23:32,904 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 6 [2021-11-07 02:23:32,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:32,905 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-07 02:23:32,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:32,906 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-07 02:23:32,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 02:23:32,906 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:32,907 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 02:23:32,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:33,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:33,116 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:33,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:33,117 INFO L85 PathProgramCache]: Analyzing trace with hash 889508874, now seen corresponding path program 1 times [2021-11-07 02:23:33,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:33,118 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [150741620] [2021-11-07 02:23:33,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:33,119 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:33,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:33,123 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:33,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 02:23:33,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:33,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:23:33,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:33,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-07 02:23:33,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:33,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:33,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:33,582 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:33,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [150741620] [2021-11-07 02:23:33,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [150741620] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:33,583 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:23:33,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-07 02:23:33,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775119175] [2021-11-07 02:23:33,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:23:33,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:33,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:23:33,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:23:33,588 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:34,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:34,596 INFO L93 Difference]: Finished difference Result 105 states and 115 transitions. [2021-11-07 02:23:34,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:23:34,604 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 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 6 [2021-11-07 02:23:34,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:34,606 INFO L225 Difference]: With dead ends: 105 [2021-11-07 02:23:34,607 INFO L226 Difference]: Without dead ends: 105 [2021-11-07 02:23:34,608 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:23:34,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-07 02:23:34,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 41. [2021-11-07 02:23:34,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 40 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:34,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-11-07 02:23:34,619 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 6 [2021-11-07 02:23:34,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:34,620 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-11-07 02:23:34,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:34,621 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-11-07 02:23:34,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 02:23:34,622 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:34,622 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:23:34,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:34,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:34,840 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:34,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:34,841 INFO L85 PathProgramCache]: Analyzing trace with hash 176742579, now seen corresponding path program 1 times [2021-11-07 02:23:34,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:34,842 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [952824568] [2021-11-07 02:23:34,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:34,843 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:34,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:34,844 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:34,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 02:23:34,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:34,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:23:34,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:34,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-07 02:23:35,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:35,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:35,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:35,099 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:35,100 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [952824568] [2021-11-07 02:23:35,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [952824568] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:35,101 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:23:35,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:23:35,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226137913] [2021-11-07 02:23:35,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:23:35,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:35,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:23:35,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:23:35,104 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:35,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:35,306 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-11-07 02:23:35,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:23:35,310 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 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 8 [2021-11-07 02:23:35,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:35,311 INFO L225 Difference]: With dead ends: 36 [2021-11-07 02:23:35,311 INFO L226 Difference]: Without dead ends: 36 [2021-11-07 02:23:35,312 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 4 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:23:35,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-07 02:23:35,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-07 02:23:35,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:35,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-11-07 02:23:35,318 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 8 [2021-11-07 02:23:35,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:35,318 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-11-07 02:23:35,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:35,319 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-11-07 02:23:35,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 02:23:35,320 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:35,320 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:23:35,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:35,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:35,521 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:35,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:35,522 INFO L85 PathProgramCache]: Analyzing trace with hash 176742580, now seen corresponding path program 1 times [2021-11-07 02:23:35,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:35,523 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1508801856] [2021-11-07 02:23:35,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:35,523 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:35,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:35,525 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:35,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 02:23:35,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:35,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-07 02:23:35,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:35,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:23:35,814 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:35,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:36,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:36,381 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:36,382 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1508801856] [2021-11-07 02:23:36,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1508801856] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:36,382 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:23:36,383 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 5] imperfect sequences [] total 8 [2021-11-07 02:23:36,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312520787] [2021-11-07 02:23:36,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:23:36,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:36,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:23:36,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:23:36,386 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:37,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:37,127 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-11-07 02:23:37,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 02:23:37,129 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 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 8 [2021-11-07 02:23:37,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:37,130 INFO L225 Difference]: With dead ends: 38 [2021-11-07 02:23:37,131 INFO L226 Difference]: Without dead ends: 38 [2021-11-07 02:23:37,131 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:23:37,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-07 02:23:37,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 34. [2021-11-07 02:23:37,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 33 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:37,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-11-07 02:23:37,137 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 8 [2021-11-07 02:23:37,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:37,138 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-11-07 02:23:37,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:37,139 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-11-07 02:23:37,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-07 02:23:37,139 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:37,140 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:23:37,153 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-07 02:23:37,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:37,344 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:37,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:37,345 INFO L85 PathProgramCache]: Analyzing trace with hash -1091210163, now seen corresponding path program 1 times [2021-11-07 02:23:37,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:37,346 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1724691985] [2021-11-07 02:23:37,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:37,346 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:37,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:37,348 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:37,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 02:23:37,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:37,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:23:37,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:37,558 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:37,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:37,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:37,657 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:37,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1724691985] [2021-11-07 02:23:37,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1724691985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:37,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [609279226] [2021-11-07 02:23:37,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:37,659 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:37,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:23:37,666 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:23:37,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-07 02:23:37,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:37,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:23:37,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:37,949 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:37,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:38,025 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:38,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [609279226] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:38,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809383919] [2021-11-07 02:23:38,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:38,028 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:23:38,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:23:38,030 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:23:38,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 02:23:38,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:38,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:23:38,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:38,248 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:38,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:38,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:38,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809383919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:38,310 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:23:38,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-07 02:23:38,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758056505] [2021-11-07 02:23:38,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:23:38,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:38,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:23:38,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:23:38,313 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:38,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:38,431 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2021-11-07 02:23:38,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 02:23:38,433 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 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 10 [2021-11-07 02:23:38,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:38,434 INFO L225 Difference]: With dead ends: 63 [2021-11-07 02:23:38,434 INFO L226 Difference]: Without dead ends: 63 [2021-11-07 02:23:38,435 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:23:38,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-07 02:23:38,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 40. [2021-11-07 02:23:38,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:38,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-07 02:23:38,441 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 10 [2021-11-07 02:23:38,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:38,442 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-07 02:23:38,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:38,442 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-07 02:23:38,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-07 02:23:38,443 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:38,443 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:23:38,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:38,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:38,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-07 02:23:39,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:39,053 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:39,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:39,054 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-11-07 02:23:39,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:39,054 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [395334974] [2021-11-07 02:23:39,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:39,055 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:39,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:39,056 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:39,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 02:23:39,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:39,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:23:39,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:39,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:23:39,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:39,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:40,369 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:40,370 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:40,370 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [395334974] [2021-11-07 02:23:40,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [395334974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:40,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1096116246] [2021-11-07 02:23:40,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:40,371 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:40,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:23:40,376 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:23:40,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-07 02:23:40,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:40,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 02:23:40,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:40,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:23:40,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:40,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:41,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:41,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1096116246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:41,330 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929767341] [2021-11-07 02:23:41,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:41,330 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:23:41,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:23:41,336 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:23:41,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-07 02:23:41,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:41,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 02:23:41,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:41,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:23:41,716 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:41,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:42,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:42,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929767341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:42,060 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:23:42,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 12 [2021-11-07 02:23:42,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088985286] [2021-11-07 02:23:42,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-07 02:23:42,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:42,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-07 02:23:42,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:23:42,064 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:43,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:43,937 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2021-11-07 02:23:43,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:23:43,939 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 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 10 [2021-11-07 02:23:43,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:43,942 INFO L225 Difference]: With dead ends: 98 [2021-11-07 02:23:43,942 INFO L226 Difference]: Without dead ends: 98 [2021-11-07 02:23:43,943 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2021-11-07 02:23:43,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-07 02:23:43,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 52. [2021-11-07 02:23:43,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 51 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:43,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2021-11-07 02:23:43,949 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 10 [2021-11-07 02:23:43,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:43,950 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2021-11-07 02:23:43,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:43,950 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2021-11-07 02:23:43,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-07 02:23:43,951 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:43,951 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:23:43,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-07 02:23:44,177 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-07 02:23:44,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:44,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:44,552 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:44,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:44,553 INFO L85 PathProgramCache]: Analyzing trace with hash -680998151, now seen corresponding path program 1 times [2021-11-07 02:23:44,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:44,553 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [847754633] [2021-11-07 02:23:44,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:44,554 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:44,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:44,555 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:44,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 02:23:44,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:44,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:23:44,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:44,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:23:44,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:44,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:23:44,820 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:44,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [847754633] [2021-11-07 02:23:44,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [847754633] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:44,821 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:23:44,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:23:44,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488348677] [2021-11-07 02:23:44,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:23:44,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:44,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:23:44,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:23:44,824 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:44,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:44,915 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2021-11-07 02:23:44,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:23:44,916 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 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 12 [2021-11-07 02:23:44,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:44,919 INFO L225 Difference]: With dead ends: 57 [2021-11-07 02:23:44,919 INFO L226 Difference]: Without dead ends: 57 [2021-11-07 02:23:44,920 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:23:44,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-07 02:23:44,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-11-07 02:23:44,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 47 states have (on average 1.297872340425532) internal successors, (61), 53 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 02:23:44,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2021-11-07 02:23:44,926 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 12 [2021-11-07 02:23:44,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:44,926 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2021-11-07 02:23:44,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:44,927 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2021-11-07 02:23:44,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-07 02:23:44,928 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:44,928 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:23:44,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:45,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:45,141 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:45,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:45,141 INFO L85 PathProgramCache]: Analyzing trace with hash -1074025161, now seen corresponding path program 1 times [2021-11-07 02:23:45,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:45,142 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1675980464] [2021-11-07 02:23:45,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:45,142 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:45,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:45,143 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:45,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 02:23:45,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:45,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 02:23:45,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:45,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:23:45,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:23:45,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:46,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:23:46,371 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:46,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1675980464] [2021-11-07 02:23:46,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1675980464] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:46,375 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:23:46,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2021-11-07 02:23:46,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036994942] [2021-11-07 02:23:46,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:23:46,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:46,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:23:46,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:23:46,380 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:47,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:47,436 INFO L93 Difference]: Finished difference Result 77 states and 87 transitions. [2021-11-07 02:23:47,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 02:23:47,437 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 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 12 [2021-11-07 02:23:47,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:47,438 INFO L225 Difference]: With dead ends: 77 [2021-11-07 02:23:47,438 INFO L226 Difference]: Without dead ends: 77 [2021-11-07 02:23:47,439 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2021-11-07 02:23:47,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-07 02:23:47,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 70. [2021-11-07 02:23:47,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 63 states have (on average 1.3492063492063493) internal successors, (85), 69 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:47,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 85 transitions. [2021-11-07 02:23:47,446 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 85 transitions. Word has length 12 [2021-11-07 02:23:47,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:47,447 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 85 transitions. [2021-11-07 02:23:47,447 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:47,447 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 85 transitions. [2021-11-07 02:23:47,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 02:23:47,448 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:47,448 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:23:47,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:47,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:47,652 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:47,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:47,652 INFO L85 PathProgramCache]: Analyzing trace with hash 363893229, now seen corresponding path program 1 times [2021-11-07 02:23:47,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:47,653 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [77456690] [2021-11-07 02:23:47,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:47,653 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:47,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:47,654 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:47,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 02:23:47,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:47,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:23:47,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:47,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-07 02:23:48,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:23:48,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:52,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:23:52,183 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:52,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [77456690] [2021-11-07 02:23:52,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [77456690] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:52,183 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:23:52,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [] total 7 [2021-11-07 02:23:52,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482832368] [2021-11-07 02:23:52,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:23:52,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:52,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:23:52,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=36, Unknown=2, NotChecked=0, Total=56 [2021-11-07 02:23:52,186 INFO L87 Difference]: Start difference. First operand 70 states and 85 transitions. Second operand has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 8 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:52,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:52,428 INFO L93 Difference]: Finished difference Result 69 states and 84 transitions. [2021-11-07 02:23:52,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:23:52,430 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 8 states have internal predecessors, (26), 0 states have call successors, (0), 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 13 [2021-11-07 02:23:52,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:52,431 INFO L225 Difference]: With dead ends: 69 [2021-11-07 02:23:52,431 INFO L226 Difference]: Without dead ends: 59 [2021-11-07 02:23:52,432 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=23, Invalid=47, Unknown=2, NotChecked=0, Total=72 [2021-11-07 02:23:52,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-07 02:23:52,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-07 02:23:52,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 53 states have (on average 1.3396226415094339) internal successors, (71), 58 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:52,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 71 transitions. [2021-11-07 02:23:52,437 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 71 transitions. Word has length 13 [2021-11-07 02:23:52,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:52,437 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 71 transitions. [2021-11-07 02:23:52,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 8 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:52,438 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 71 transitions. [2021-11-07 02:23:52,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-07 02:23:52,438 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:52,439 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:23:52,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:52,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:52,652 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:52,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:52,653 INFO L85 PathProgramCache]: Analyzing trace with hash -749048740, now seen corresponding path program 1 times [2021-11-07 02:23:52,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:52,654 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [578378660] [2021-11-07 02:23:52,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:52,654 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:52,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:52,656 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:52,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 02:23:52,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:52,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 02:23:52,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:52,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:23:53,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:23:53,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:55,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:23:55,263 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:55,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [578378660] [2021-11-07 02:23:55,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [578378660] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:55,263 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:23:55,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 10 [2021-11-07 02:23:55,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215893688] [2021-11-07 02:23:55,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 02:23:55,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:55,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 02:23:55,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:23:55,265 INFO L87 Difference]: Start difference. First operand 59 states and 71 transitions. Second operand has 11 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:57,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:57,905 INFO L93 Difference]: Finished difference Result 118 states and 134 transitions. [2021-11-07 02:23:57,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-07 02:23:57,906 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 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 16 [2021-11-07 02:23:57,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:57,907 INFO L225 Difference]: With dead ends: 118 [2021-11-07 02:23:57,907 INFO L226 Difference]: Without dead ends: 118 [2021-11-07 02:23:57,908 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2021-11-07 02:23:57,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-07 02:23:57,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 75. [2021-11-07 02:23:57,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 74 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:57,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 92 transitions. [2021-11-07 02:23:57,916 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 92 transitions. Word has length 16 [2021-11-07 02:23:57,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:57,917 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 92 transitions. [2021-11-07 02:23:57,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:57,917 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 92 transitions. [2021-11-07 02:23:57,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-07 02:23:57,919 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:57,919 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-07 02:23:57,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-07 02:23:58,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:58,133 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:23:58,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:58,133 INFO L85 PathProgramCache]: Analyzing trace with hash 302966996, now seen corresponding path program 2 times [2021-11-07 02:23:58,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:58,134 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1884425150] [2021-11-07 02:23:58,134 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:23:58,134 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:58,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:58,136 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:58,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 02:23:58,372 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:23:58,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:23:58,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-07 02:23:58,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:58,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:23:59,288 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:59,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:01,661 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:01,661 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:24:01,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1884425150] [2021-11-07 02:24:01,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1884425150] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:01,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [668299067] [2021-11-07 02:24:01,662 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:24:01,662 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:24:01,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:24:01,668 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:24:01,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 02:24:02,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:24:02,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:24:02,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 02:24:02,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:02,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:24:02,789 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:02,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:04,011 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:04,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [668299067] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:04,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320708670] [2021-11-07 02:24:04,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:24:04,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:24:04,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:24:04,016 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:24:04,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-07 02:24:04,500 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:24:04,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:24:04,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-07 02:24:04,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:04,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:24:05,047 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:05,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:07,432 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:07,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320708670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:07,433 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:24:07,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 10, 10] total 27 [2021-11-07 02:24:07,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370602460] [2021-11-07 02:24:07,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-07 02:24:07,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:24:07,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-07 02:24:07,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=539, Unknown=0, NotChecked=0, Total=756 [2021-11-07 02:24:07,437 INFO L87 Difference]: Start difference. First operand 75 states and 92 transitions. Second operand has 28 states, 27 states have (on average 2.740740740740741) internal successors, (74), 28 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 02:24:17,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:24:17,870 INFO L93 Difference]: Finished difference Result 515 states and 642 transitions. [2021-11-07 02:24:17,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-07 02:24:17,872 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.740740740740741) internal successors, (74), 28 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 22 [2021-11-07 02:24:17,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:24:17,876 INFO L225 Difference]: With dead ends: 515 [2021-11-07 02:24:17,876 INFO L226 Difference]: Without dead ends: 515 [2021-11-07 02:24:17,878 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=463, Invalid=1097, Unknown=0, NotChecked=0, Total=1560 [2021-11-07 02:24:17,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2021-11-07 02:24:17,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 99. [2021-11-07 02:24:17,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 93 states have (on average 1.3118279569892473) internal successors, (122), 98 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:17,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 122 transitions. [2021-11-07 02:24:17,892 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 122 transitions. Word has length 22 [2021-11-07 02:24:17,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:24:17,893 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 122 transitions. [2021-11-07 02:24:17,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.740740740740741) internal successors, (74), 28 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 02:24:17,894 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 122 transitions. [2021-11-07 02:24:17,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-07 02:24:17,895 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:24:17,895 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:24:17,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:18,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:18,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:18,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:24:18,499 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:24:18,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:24:18,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1504406454, now seen corresponding path program 1 times [2021-11-07 02:24:18,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:24:18,500 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1289740710] [2021-11-07 02:24:18,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:18,500 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:24:18,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:24:18,502 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:24:18,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-07 02:24:18,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:18,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:24:18,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:19,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:24:19,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:19,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:24:19,141 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:24:19,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1289740710] [2021-11-07 02:24:19,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1289740710] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:24:19,142 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:24:19,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-11-07 02:24:19,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243874371] [2021-11-07 02:24:19,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 02:24:19,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:24:19,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 02:24:19,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-07 02:24:19,144 INFO L87 Difference]: Start difference. First operand 99 states and 122 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:19,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:24:19,583 INFO L93 Difference]: Finished difference Result 140 states and 161 transitions. [2021-11-07 02:24:19,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 02:24:19,584 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 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 23 [2021-11-07 02:24:19,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:24:19,585 INFO L225 Difference]: With dead ends: 140 [2021-11-07 02:24:19,585 INFO L226 Difference]: Without dead ends: 140 [2021-11-07 02:24:19,586 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:24:19,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-07 02:24:19,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 99. [2021-11-07 02:24:19,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 93 states have (on average 1.2903225806451613) internal successors, (120), 98 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:19,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 120 transitions. [2021-11-07 02:24:19,603 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 120 transitions. Word has length 23 [2021-11-07 02:24:19,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:24:19,604 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 120 transitions. [2021-11-07 02:24:19,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:19,604 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 120 transitions. [2021-11-07 02:24:19,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-07 02:24:19,608 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:24:19,608 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:24:19,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:19,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:24:19,824 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:24:19,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:24:19,824 INFO L85 PathProgramCache]: Analyzing trace with hash 1281483751, now seen corresponding path program 1 times [2021-11-07 02:24:19,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:24:19,825 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1250062578] [2021-11-07 02:24:19,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:19,825 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:24:19,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:24:19,827 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:24:19,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 02:24:20,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:20,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:24:20,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:20,357 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:24:20,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:20,528 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:24:20,529 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:24:20,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1250062578] [2021-11-07 02:24:20,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1250062578] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:20,529 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1096005587] [2021-11-07 02:24:20,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:20,530 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:24:20,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:24:20,532 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:24:20,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-07 02:24:21,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:21,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 02:24:21,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:21,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:24:21,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:21,795 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:24:21,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1096005587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:21,795 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439046742] [2021-11-07 02:24:21,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:21,795 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:24:21,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:24:21,799 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:24:21,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-07 02:24:22,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:22,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:24:22,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:22,404 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:24:22,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:22,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:24:22,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439046742] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:22,517 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:24:22,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7, 6, 6, 6] total 18 [2021-11-07 02:24:22,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412286880] [2021-11-07 02:24:22,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 02:24:22,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:24:22,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 02:24:22,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-11-07 02:24:22,520 INFO L87 Difference]: Start difference. First operand 99 states and 120 transitions. Second operand has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:23,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:24:23,455 INFO L93 Difference]: Finished difference Result 98 states and 110 transitions. [2021-11-07 02:24:23,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-07 02:24:23,456 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-07 02:24:23,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:24:23,457 INFO L225 Difference]: With dead ends: 98 [2021-11-07 02:24:23,457 INFO L226 Difference]: Without dead ends: 96 [2021-11-07 02:24:23,458 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2021-11-07 02:24:23,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-07 02:24:23,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2021-11-07 02:24:23,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.2093023255813953) internal successors, (104), 90 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:23,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 104 transitions. [2021-11-07 02:24:23,472 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 104 transitions. Word has length 25 [2021-11-07 02:24:23,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:24:23,473 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 104 transitions. [2021-11-07 02:24:23,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 18 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:23,473 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 104 transitions. [2021-11-07 02:24:23,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-07 02:24:23,475 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:24:23,475 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:24:23,508 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-07 02:24:23,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:23,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:24,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:24:24,092 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:24:24,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:24:24,093 INFO L85 PathProgramCache]: Analyzing trace with hash 1088586340, now seen corresponding path program 1 times [2021-11-07 02:24:24,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:24:24,093 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [364405713] [2021-11-07 02:24:24,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:24,093 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:24:24,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:24:24,095 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:24:24,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 02:24:24,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:24,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-07 02:24:24,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:24,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:24:25,661 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:24:25,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:27,332 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:24:27,332 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:24:27,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [364405713] [2021-11-07 02:24:27,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [364405713] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:27,333 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [305255300] [2021-11-07 02:24:27,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:27,333 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:24:27,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:24:27,334 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:24:27,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 02:24:28,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:28,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-07 02:24:28,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:28,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:24:29,595 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:29,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:31,382 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:31,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [305255300] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:31,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135281533] [2021-11-07 02:24:31,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:31,383 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:24:31,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:24:31,390 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:24:31,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-07 02:24:32,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:32,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-07 02:24:32,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:32,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:24:32,798 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:24:32,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:33,785 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:24:33,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135281533] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:33,786 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:24:33,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 10, 9, 7, 6] total 26 [2021-11-07 02:24:33,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143098681] [2021-11-07 02:24:33,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-07 02:24:33,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:24:33,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-07 02:24:33,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702 [2021-11-07 02:24:33,788 INFO L87 Difference]: Start difference. First operand 91 states and 104 transitions. Second operand has 27 states, 26 states have (on average 3.5) internal successors, (91), 27 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:44,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:24:44,763 INFO L93 Difference]: Finished difference Result 223 states and 248 transitions. [2021-11-07 02:24:44,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-07 02:24:44,764 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 27 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-07 02:24:44,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:24:44,766 INFO L225 Difference]: With dead ends: 223 [2021-11-07 02:24:44,766 INFO L226 Difference]: Without dead ends: 223 [2021-11-07 02:24:44,767 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=652, Invalid=2000, Unknown=0, NotChecked=0, Total=2652 [2021-11-07 02:24:44,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-07 02:24:44,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 99. [2021-11-07 02:24:44,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.2127659574468086) internal successors, (114), 98 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 02:24:44,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 114 transitions. [2021-11-07 02:24:44,773 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 114 transitions. Word has length 30 [2021-11-07 02:24:44,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:24:44,774 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 114 transitions. [2021-11-07 02:24:44,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 27 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:24:44,775 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 114 transitions. [2021-11-07 02:24:44,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-07 02:24:44,776 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:24:44,776 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:24:44,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:45,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:45,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 02:24:45,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:24:45,381 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:24:45,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:24:45,382 INFO L85 PathProgramCache]: Analyzing trace with hash 844993110, now seen corresponding path program 1 times [2021-11-07 02:24:45,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:24:45,382 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1943520131] [2021-11-07 02:24:45,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:45,383 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:24:45,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:24:45,383 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:24:45,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-07 02:24:46,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:46,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 02:24:46,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:46,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:24:47,222 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:24:47,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:49,139 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:24:49,139 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:24:49,139 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1943520131] [2021-11-07 02:24:49,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1943520131] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:49,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [111126257] [2021-11-07 02:24:49,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:49,140 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:24:49,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:24:49,147 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:24:49,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-07 02:24:50,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:50,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 02:24:50,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:51,364 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:51,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:52,509 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:24:52,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [111126257] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:52,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805876122] [2021-11-07 02:24:52,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:24:52,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:24:52,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:24:52,510 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:24:52,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-07 02:24:53,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:24:53,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:24:53,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:24:53,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:24:54,171 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:24:54,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:24:56,418 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:24:56,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1805876122] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:24:56,419 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:24:56,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 10, 9, 8, 7] total 33 [2021-11-07 02:24:56,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88728679] [2021-11-07 02:24:56,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-07 02:24:56,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:24:56,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-07 02:24:56,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=923, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 02:24:56,422 INFO L87 Difference]: Start difference. First operand 99 states and 114 transitions. Second operand has 33 states, 33 states have (on average 3.757575757575758) internal successors, (124), 33 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:25:24,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:25:24,872 INFO L93 Difference]: Finished difference Result 180 states and 202 transitions. [2021-11-07 02:25:24,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-07 02:25:24,874 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.757575757575758) internal successors, (124), 33 states have internal predecessors, (124), 0 states have call successors, (0), 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 33 [2021-11-07 02:25:24,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:25:24,875 INFO L225 Difference]: With dead ends: 180 [2021-11-07 02:25:24,875 INFO L226 Difference]: Without dead ends: 160 [2021-11-07 02:25:24,877 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 905 ImplicationChecksByTransitivity, 28.3s TimeCoverageRelationStatistics Valid=859, Invalid=3563, Unknown=0, NotChecked=0, Total=4422 [2021-11-07 02:25:24,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-07 02:25:24,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 88. [2021-11-07 02:25:24,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 85 states have (on average 1.1647058823529413) internal successors, (99), 87 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:25:24,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 99 transitions. [2021-11-07 02:25:24,883 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 99 transitions. Word has length 33 [2021-11-07 02:25:24,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:25:24,883 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 99 transitions. [2021-11-07 02:25:24,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.757575757575758) internal successors, (124), 33 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:25:24,884 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 99 transitions. [2021-11-07 02:25:24,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-07 02:25:24,886 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:25:24,886 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:25:24,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-07 02:25:25,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-07 02:25:25,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-07 02:25:25,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:25:25,502 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:25:25,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:25:25,502 INFO L85 PathProgramCache]: Analyzing trace with hash -613206755, now seen corresponding path program 1 times [2021-11-07 02:25:25,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:25:25,503 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [536833538] [2021-11-07 02:25:25,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:25:25,503 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:25:25,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:25:25,505 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:25:25,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 02:25:26,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:25:26,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-07 02:25:26,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:25:26,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:25:27,390 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:25:27,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:25:30,531 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:25:30,531 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:25:30,531 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [536833538] [2021-11-07 02:25:30,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [536833538] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:25:30,531 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1325494588] [2021-11-07 02:25:30,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:25:30,531 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:25:30,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:25:30,532 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:25:30,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 02:25:31,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:25:31,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 02:25:31,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:25:32,922 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:25:32,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:25:34,345 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:25:34,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1325494588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:25:34,346 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069449241] [2021-11-07 02:25:34,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:25:34,346 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:25:34,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:25:34,347 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:25:34,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-07 02:25:35,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:25:35,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-07 02:25:35,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:25:35,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:25:36,774 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:25:36,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:25:40,725 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:25:40,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069449241] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:25:40,725 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:25:40,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11, 10, 10, 11] total 47 [2021-11-07 02:25:40,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943311517] [2021-11-07 02:25:40,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-07 02:25:40,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:25:40,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-07 02:25:40,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1850, Unknown=0, NotChecked=0, Total=2162 [2021-11-07 02:25:40,730 INFO L87 Difference]: Start difference. First operand 88 states and 99 transitions. Second operand has 47 states, 47 states have (on average 3.872340425531915) internal successors, (182), 47 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:25:53,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:25:53,583 INFO L93 Difference]: Finished difference Result 205 states and 228 transitions. [2021-11-07 02:25:53,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-07 02:25:53,585 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.872340425531915) internal successors, (182), 47 states have internal predecessors, (182), 0 states have call successors, (0), 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 40 [2021-11-07 02:25:53,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:25:53,587 INFO L225 Difference]: With dead ends: 205 [2021-11-07 02:25:53,587 INFO L226 Difference]: Without dead ends: 199 [2021-11-07 02:25:53,590 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 188 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1587 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=1187, Invalid=4819, Unknown=0, NotChecked=0, Total=6006 [2021-11-07 02:25:53,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-07 02:25:53,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 180. [2021-11-07 02:25:53,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 177 states have (on average 1.1581920903954803) internal successors, (205), 179 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:25:53,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 205 transitions. [2021-11-07 02:25:53,598 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 205 transitions. Word has length 40 [2021-11-07 02:25:53,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:25:53,599 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 205 transitions. [2021-11-07 02:25:53,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.872340425531915) internal successors, (182), 47 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:25:53,599 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 205 transitions. [2021-11-07 02:25:53,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-07 02:25:53,601 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:25:53,601 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:25:53,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 02:25:53,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 02:25:54,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-07 02:25:54,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:25:54,223 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:25:54,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:25:54,223 INFO L85 PathProgramCache]: Analyzing trace with hash -464583823, now seen corresponding path program 1 times [2021-11-07 02:25:54,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:25:54,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [465876625] [2021-11-07 02:25:54,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:25:54,224 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:25:54,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:25:54,225 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:25:54,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-07 02:25:55,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:25:55,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 02:25:55,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:25:55,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:25:56,724 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:25:56,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:25:59,210 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:25:59,210 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:25:59,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [465876625] [2021-11-07 02:25:59,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [465876625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:25:59,211 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [98759965] [2021-11-07 02:25:59,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:25:59,211 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:25:59,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:25:59,216 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:25:59,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-07 02:26:00,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:26:00,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 02:26:00,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:26:00,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:26:03,025 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:26:03,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:26:05,601 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:26:05,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [98759965] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:26:05,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537959520] [2021-11-07 02:26:05,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:26:05,602 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:26:05,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:26:05,603 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:26:05,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-07 02:26:06,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:26:06,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:26:06,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:26:07,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:26:08,415 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:26:08,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:26:14,740 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:26:14,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537959520] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:26:14,741 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:26:14,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 12, 11, 9, 8] total 38 [2021-11-07 02:26:14,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502897877] [2021-11-07 02:26:14,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-07 02:26:14,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:26:14,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-07 02:26:14,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1280, Unknown=0, NotChecked=0, Total=1482 [2021-11-07 02:26:14,744 INFO L87 Difference]: Start difference. First operand 180 states and 205 transitions. Second operand has 39 states, 38 states have (on average 4.184210526315789) internal successors, (159), 39 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:26:34,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:26:34,299 INFO L93 Difference]: Finished difference Result 319 states and 350 transitions. [2021-11-07 02:26:34,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-07 02:26:34,300 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 4.184210526315789) internal successors, (159), 39 states have internal predecessors, (159), 0 states have call successors, (0), 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 43 [2021-11-07 02:26:34,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:26:34,304 INFO L225 Difference]: With dead ends: 319 [2021-11-07 02:26:34,304 INFO L226 Difference]: Without dead ends: 319 [2021-11-07 02:26:34,306 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1212 ImplicationChecksByTransitivity, 21.5s TimeCoverageRelationStatistics Valid=1132, Invalid=3980, Unknown=0, NotChecked=0, Total=5112 [2021-11-07 02:26:34,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2021-11-07 02:26:34,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 222. [2021-11-07 02:26:34,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 219 states have (on average 1.1689497716894977) internal successors, (256), 221 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:26:34,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 256 transitions. [2021-11-07 02:26:34,316 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 256 transitions. Word has length 43 [2021-11-07 02:26:34,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:26:34,317 INFO L470 AbstractCegarLoop]: Abstraction has 222 states and 256 transitions. [2021-11-07 02:26:34,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 4.184210526315789) internal successors, (159), 39 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:26:34,318 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 256 transitions. [2021-11-07 02:26:34,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 02:26:34,319 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:26:34,320 INFO L513 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1] [2021-11-07 02:26:34,354 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-07 02:26:34,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-07 02:26:34,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2021-11-07 02:26:34,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:26:34,936 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:26:34,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:26:34,937 INFO L85 PathProgramCache]: Analyzing trace with hash 1048882662, now seen corresponding path program 3 times [2021-11-07 02:26:34,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:26:34,937 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [301639832] [2021-11-07 02:26:34,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:26:34,938 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:26:34,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:26:34,940 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:26:34,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 02:26:36,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-07 02:26:36,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:26:36,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-07 02:26:36,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:26:36,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:26:38,240 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:26:38,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:26:44,076 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:26:44,077 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:26:44,077 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [301639832] [2021-11-07 02:26:44,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [301639832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:26:44,077 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [33760929] [2021-11-07 02:26:44,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:26:44,077 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:26:44,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:26:44,078 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:26:44,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 02:26:47,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-07 02:26:47,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:26:47,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-07 02:26:47,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:26:48,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:26:49,803 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:26:49,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:27:12,055 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:27:12,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [33760929] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:27:12,056 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468670748] [2021-11-07 02:27:12,056 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:27:12,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:27:12,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:27:12,057 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:27:12,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-07 02:27:22,505 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-07 02:27:22,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:27:22,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-07 02:27:22,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:27:22,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:27:24,543 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:27:24,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:27:40,370 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:27:40,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468670748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:27:40,370 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:27:40,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 17, 21, 19, 19] total 74 [2021-11-07 02:27:40,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525689486] [2021-11-07 02:27:40,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-07 02:27:40,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:27:40,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-07 02:27:40,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1499, Invalid=4051, Unknown=0, NotChecked=0, Total=5550 [2021-11-07 02:27:40,374 INFO L87 Difference]: Start difference. First operand 222 states and 256 transitions. Second operand has 75 states, 74 states have (on average 2.972972972972973) internal successors, (220), 75 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:27:50,610 WARN L207 SmtUtils]: Spent 6.18 s on a formula simplification that was a NOOP. DAG size: 129 [2021-11-07 02:27:57,098 WARN L207 SmtUtils]: Spent 5.79 s on a formula simplification that was a NOOP. DAG size: 125 [2021-11-07 02:29:06,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:29:06,125 INFO L93 Difference]: Finished difference Result 2532 states and 2985 transitions. [2021-11-07 02:29:06,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-07 02:29:06,128 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 2.972972972972973) internal successors, (220), 75 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 02:29:06,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:29:06,144 INFO L225 Difference]: With dead ends: 2532 [2021-11-07 02:29:06,144 INFO L226 Difference]: Without dead ends: 2532 [2021-11-07 02:29:06,149 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 200 SyntacticMatches, 4 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4453 ImplicationChecksByTransitivity, 88.8s TimeCoverageRelationStatistics Valid=2852, Invalid=7248, Unknown=0, NotChecked=0, Total=10100 [2021-11-07 02:29:06,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2532 states. [2021-11-07 02:29:06,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2532 to 270. [2021-11-07 02:29:06,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 267 states have (on average 1.1835205992509363) internal successors, (316), 269 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:29:06,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 316 transitions. [2021-11-07 02:29:06,180 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 316 transitions. Word has length 46 [2021-11-07 02:29:06,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:29:06,180 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 316 transitions. [2021-11-07 02:29:06,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 74 states have (on average 2.972972972972973) internal successors, (220), 75 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:29:06,181 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 316 transitions. [2021-11-07 02:29:06,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 02:29:06,183 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:29:06,184 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:29:06,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-07 02:29:06,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-07 02:29:06,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-07 02:29:06,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:29:06,798 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:29:06,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:29:06,798 INFO L85 PathProgramCache]: Analyzing trace with hash 1772975218, now seen corresponding path program 2 times [2021-11-07 02:29:06,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:29:06,799 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2105674592] [2021-11-07 02:29:06,799 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:29:06,799 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:29:06,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:29:06,800 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:29:06,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-07 02:29:08,500 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:29:08,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:29:08,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:29:08,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:08,721 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 3 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:29:08,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:29:09,146 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 3 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:29:09,146 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:29:09,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2105674592] [2021-11-07 02:29:09,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2105674592] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:29:09,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [599870591] [2021-11-07 02:29:09,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:29:09,147 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:29:09,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:29:09,156 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:29:09,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-07 02:29:11,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:29:11,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:29:11,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-07 02:29:11,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:11,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:29:12,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-07 02:29:12,849 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 3 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:29:12,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:29:13,907 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 3 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:29:13,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [599870591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:29:13,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119054854] [2021-11-07 02:29:13,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:29:13,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:29:13,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:29:13,910 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:29:13,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-07 02:29:16,027 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:29:16,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:29:16,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-07 02:29:16,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:16,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:29:17,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-11-07 02:29:17,396 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 3 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:29:17,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:29:18,527 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 3 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 02:29:18,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119054854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:29:18,527 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:29:18,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 15, 9, 11, 9] total 33 [2021-11-07 02:29:18,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815458062] [2021-11-07 02:29:18,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-07 02:29:18,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:29:18,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-07 02:29:18,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 02:29:18,530 INFO L87 Difference]: Start difference. First operand 270 states and 316 transitions. Second operand has 33 states, 33 states have (on average 5.363636363636363) internal successors, (177), 33 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:29:24,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:29:24,299 INFO L93 Difference]: Finished difference Result 289 states and 331 transitions. [2021-11-07 02:29:24,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 02:29:24,300 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 5.363636363636363) internal successors, (177), 33 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 02:29:24,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:29:24,301 INFO L225 Difference]: With dead ends: 289 [2021-11-07 02:29:24,301 INFO L226 Difference]: Without dead ends: 243 [2021-11-07 02:29:24,303 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 274 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 653 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=600, Invalid=2592, Unknown=0, NotChecked=0, Total=3192 [2021-11-07 02:29:24,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-07 02:29:24,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 227. [2021-11-07 02:29:24,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 224 states have (on average 1.1964285714285714) internal successors, (268), 226 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:29:24,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 268 transitions. [2021-11-07 02:29:24,310 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 268 transitions. Word has length 52 [2021-11-07 02:29:24,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:29:24,311 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 268 transitions. [2021-11-07 02:29:24,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 5.363636363636363) internal successors, (177), 33 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:29:24,312 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 268 transitions. [2021-11-07 02:29:24,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-07 02:29:24,313 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:29:24,313 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:29:24,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (39)] Ended with exit code 0 [2021-11-07 02:29:24,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-07 02:29:24,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (38)] Ended with exit code 0 [2021-11-07 02:29:24,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:29:24,922 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:29:24,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:29:24,922 INFO L85 PathProgramCache]: Analyzing trace with hash 1709002354, now seen corresponding path program 1 times [2021-11-07 02:29:24,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:29:24,923 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [464197132] [2021-11-07 02:29:24,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:29:24,923 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:29:24,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:29:24,924 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:29:24,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-07 02:29:26,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:29:26,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:29:26,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:27,011 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 23 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:27,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:29:27,247 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 23 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:27,247 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:29:27,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [464197132] [2021-11-07 02:29:27,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [464197132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:29:27,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [616025451] [2021-11-07 02:29:27,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:29:27,248 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:29:27,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:29:27,277 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:29:27,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-07 02:29:29,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:29:29,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:29:29,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:30,050 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 21 proven. 22 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:30,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:29:30,220 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 21 proven. 22 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:30,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [616025451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:29:30,220 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768679092] [2021-11-07 02:29:30,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:29:30,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:29:30,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:29:30,221 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:29:30,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-07 02:29:32,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:29:32,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 02:29:32,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:32,675 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 23 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:32,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:29:33,050 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 23 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:33,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768679092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:29:33,050 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:29:33,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 9, 10] total 17 [2021-11-07 02:29:33,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810306801] [2021-11-07 02:29:33,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-07 02:29:33,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:29:33,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-07 02:29:33,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2021-11-07 02:29:33,052 INFO L87 Difference]: Start difference. First operand 227 states and 268 transitions. Second operand has 17 states, 17 states have (on average 5.294117647058823) internal successors, (90), 17 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:29:34,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:29:34,222 INFO L93 Difference]: Finished difference Result 292 states and 330 transitions. [2021-11-07 02:29:34,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 02:29:34,224 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.294117647058823) internal successors, (90), 17 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-07 02:29:34,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:29:34,226 INFO L225 Difference]: With dead ends: 292 [2021-11-07 02:29:34,226 INFO L226 Difference]: Without dead ends: 292 [2021-11-07 02:29:34,227 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 315 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=409, Invalid=923, Unknown=0, NotChecked=0, Total=1332 [2021-11-07 02:29:34,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-11-07 02:29:34,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 231. [2021-11-07 02:29:34,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 228 states have (on average 1.1754385964912282) internal successors, (268), 230 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:29:34,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 268 transitions. [2021-11-07 02:29:34,235 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 268 transitions. Word has length 56 [2021-11-07 02:29:34,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:29:34,236 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 268 transitions. [2021-11-07 02:29:34,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.294117647058823) internal successors, (90), 17 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:29:34,236 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 268 transitions. [2021-11-07 02:29:34,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-07 02:29:34,237 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:29:34,237 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:29:34,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-07 02:29:34,491 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-07 02:29:34,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-07 02:29:34,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:29:34,853 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:29:34,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:29:34,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1845961675, now seen corresponding path program 1 times [2021-11-07 02:29:34,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:29:34,854 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [487327270] [2021-11-07 02:29:34,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:29:34,855 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:29:34,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:29:34,856 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:29:34,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-07 02:29:36,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:29:36,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:29:36,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:36,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:29:38,424 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:38,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:29:41,493 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:41,494 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:29:41,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [487327270] [2021-11-07 02:29:41,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [487327270] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:29:41,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [862857804] [2021-11-07 02:29:41,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:29:41,494 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:29:41,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:29:41,496 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:29:41,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-07 02:29:44,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:29:44,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:29:44,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:45,969 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 15 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:29:45,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:29:48,199 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 15 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:29:48,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [862857804] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:29:48,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404129919] [2021-11-07 02:29:48,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:29:48,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:29:48,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:29:48,220 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:29:48,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-07 02:29:50,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:29:50,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 02:29:50,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:29:50,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:29:52,926 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:29:52,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:30:00,920 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:30:00,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404129919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:30:00,920 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:30:00,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 14, 13, 11, 11] total 58 [2021-11-07 02:30:00,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73011804] [2021-11-07 02:30:00,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-07 02:30:00,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:30:00,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-07 02:30:00,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=2971, Unknown=0, NotChecked=0, Total=3306 [2021-11-07 02:30:00,925 INFO L87 Difference]: Start difference. First operand 231 states and 268 transitions. Second operand has 58 states, 58 states have (on average 4.844827586206897) internal successors, (281), 58 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:31:04,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:31:04,563 INFO L93 Difference]: Finished difference Result 384 states and 423 transitions. [2021-11-07 02:31:04,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-07 02:31:04,565 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 4.844827586206897) internal successors, (281), 58 states have internal predecessors, (281), 0 states have call successors, (0), 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 02:31:04,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:31:04,568 INFO L225 Difference]: With dead ends: 384 [2021-11-07 02:31:04,568 INFO L226 Difference]: Without dead ends: 377 [2021-11-07 02:31:04,574 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3531 ImplicationChecksByTransitivity, 60.4s TimeCoverageRelationStatistics Valid=2530, Invalid=11750, Unknown=0, NotChecked=0, Total=14280 [2021-11-07 02:31:04,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-11-07 02:31:04,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 301. [2021-11-07 02:31:04,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 298 states have (on average 1.1442953020134228) internal successors, (341), 300 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:31:04,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 341 transitions. [2021-11-07 02:31:04,587 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 341 transitions. Word has length 58 [2021-11-07 02:31:04,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:31:04,588 INFO L470 AbstractCegarLoop]: Abstraction has 301 states and 341 transitions. [2021-11-07 02:31:04,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 4.844827586206897) internal successors, (281), 58 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:31:04,589 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 341 transitions. [2021-11-07 02:31:04,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 02:31:04,590 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:31:04,590 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:31:04,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-07 02:31:04,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-07 02:31:05,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-07 02:31:05,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:31:05,204 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:31:05,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:31:05,205 INFO L85 PathProgramCache]: Analyzing trace with hash 22158437, now seen corresponding path program 3 times [2021-11-07 02:31:05,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:31:05,206 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [474713161] [2021-11-07 02:31:05,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:31:05,206 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:31:05,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:31:05,207 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:31:05,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-07 02:31:07,625 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-07 02:31:07,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:31:07,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 02:31:07,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:31:07,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:31:09,590 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:31:09,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:31:21,979 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:31:21,979 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:31:21,980 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [474713161] [2021-11-07 02:31:21,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [474713161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:31:21,980 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [697396958] [2021-11-07 02:31:21,980 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:31:21,980 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:31:21,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:31:21,983 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:31:21,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-07 02:31:25,449 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-07 02:31:25,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:31:25,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 02:31:25,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:31:25,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:31:28,529 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:31:28,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:31:41,116 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:31:41,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [697396958] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:31:41,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505825996] [2021-11-07 02:31:41,117 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:31:41,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:31:41,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:31:41,118 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:31:41,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-07 02:31:44,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-07 02:31:44,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:31:44,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-07 02:31:44,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:31:44,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-07 02:31:46,836 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:31:46,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:31:54,706 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:31:54,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505825996] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:31:54,707 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:31:54,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 10, 10, 11, 10] total 56 [2021-11-07 02:31:54,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303569294] [2021-11-07 02:31:54,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-07 02:31:54,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:31:54,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-07 02:31:54,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=2794, Unknown=0, NotChecked=0, Total=3192 [2021-11-07 02:31:54,710 INFO L87 Difference]: Start difference. First operand 301 states and 341 transitions. Second operand has 57 states, 56 states have (on average 4.625) internal successors, (259), 57 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:32:29,479 WARN L207 SmtUtils]: Spent 5.05 s on a formula simplification. DAG size of input: 88 DAG size of output: 75 [2021-11-07 02:33:44,342 WARN L207 SmtUtils]: Spent 5.01 s on a formula simplification. DAG size of input: 111 DAG size of output: 103 [2021-11-07 02:36:21,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:36:21,457 INFO L93 Difference]: Finished difference Result 575 states and 631 transitions. [2021-11-07 02:36:21,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-07 02:36:21,462 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 4.625) internal successors, (259), 57 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 02:36:21,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:36:21,465 INFO L225 Difference]: With dead ends: 575 [2021-11-07 02:36:21,466 INFO L226 Difference]: Without dead ends: 575 [2021-11-07 02:36:21,469 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 331 SyntacticMatches, 4 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6929 ImplicationChecksByTransitivity, 250.7s TimeCoverageRelationStatistics Valid=4098, Invalid=17954, Unknown=0, NotChecked=0, Total=22052 [2021-11-07 02:36:21,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-07 02:36:21,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 421. [2021-11-07 02:36:21,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 421 states, 418 states have (on average 1.145933014354067) internal successors, (479), 420 states have internal predecessors, (479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:36:21,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 479 transitions. [2021-11-07 02:36:21,485 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 479 transitions. Word has length 66 [2021-11-07 02:36:21,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:36:21,485 INFO L470 AbstractCegarLoop]: Abstraction has 421 states and 479 transitions. [2021-11-07 02:36:21,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 4.625) internal successors, (259), 57 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:36:21,486 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 479 transitions. [2021-11-07 02:36:21,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 02:36:21,488 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:36:21,488 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:36:21,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-07 02:36:21,750 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-11-07 02:36:21,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-07 02:36:22,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:36:22,111 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-07 02:36:22,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:36:22,112 INFO L85 PathProgramCache]: Analyzing trace with hash 1000908131, now seen corresponding path program 2 times [2021-11-07 02:36:22,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:36:22,113 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [221253634] [2021-11-07 02:36:22,113 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:36:22,113 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:36:22,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:36:22,114 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:36:22,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-07 02:36:25,064 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:36:25,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:36:25,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-07 02:36:25,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:36:25,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-07 02:36:27,464 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 84 proven. 113 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:36:27,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:36:38,911 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:36:38,911 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:36:38,912 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [221253634] [2021-11-07 02:36:38,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [221253634] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:36:38,912 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [992620759] [2021-11-07 02:36:38,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:36:38,912 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:36:38,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:36:38,913 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:36:38,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_084fb410-7aeb-4db3-ba31-aaf4cde3f8d0/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-07 02:36:43,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:36:43,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:36:43,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 02:36:43,087 INFO L286 TraceCheckSpWp]: Computing forward predicates...