./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec6_product28.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/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_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec6_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 21774f07edc6bb728cb664e1a2361d7b986cd58290bb234c442a42ac18f35f10 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:17:13,407 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:17:13,410 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:17:13,469 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:17:13,470 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:17:13,474 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:17:13,477 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:17:13,481 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:17:13,484 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:17:13,490 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:17:13,491 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:17:13,493 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:17:13,493 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:17:13,496 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:17:13,499 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:17:13,503 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:17:13,504 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:17:13,505 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:17:13,507 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:17:13,515 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:17:13,518 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:17:13,519 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:17:13,523 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:17:13,524 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:17:13,530 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:17:13,531 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:17:13,531 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:17:13,532 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:17:13,533 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:17:13,534 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:17:13,534 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:17:13,536 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:17:13,537 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:17:13,538 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:17:13,539 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:17:13,539 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:17:13,540 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:17:13,540 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:17:13,540 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:17:13,541 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:17:13,542 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:17:13,543 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 02:17:13,566 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:17:13,567 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:17:13,567 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:17:13,568 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:17:13,568 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:17:13,568 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:17:13,568 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:17:13,569 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:17:13,569 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:17:13,569 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:17:13,569 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:17:13,569 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:17:13,570 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:17:13,570 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:17:13,570 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:17:13,571 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:17:13,571 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:17:13,572 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:17:13,572 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:17:13,572 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:17:13,572 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:17:13,572 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:17:13,573 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:17:13,573 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:17:13,573 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:17:13,573 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:17:13,573 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:17:13,574 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:17:13,574 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:17:13,574 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:17:13,574 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:17:13,575 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:17:13,575 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:17:13,575 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:17:13,575 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:17:13,576 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:17:13,576 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:17:13,576 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:17:13,576 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:17:13,576 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_7d39fa51-512b-4efb-8a34-52a0a9fa356a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 21774f07edc6bb728cb664e1a2361d7b986cd58290bb234c442a42ac18f35f10 [2021-11-07 02:17:13,851 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:17:13,872 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:17:13,875 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:17:13,876 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:17:13,877 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:17:13,878 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec6_product28.cil.c [2021-11-07 02:17:13,954 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data/394dcf58c/ab5ba67be073474cb220d30431f68dce/FLAGeea596be1 [2021-11-07 02:17:14,520 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:17:14,529 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/sv-benchmarks/c/product-lines/email_spec6_product28.cil.c [2021-11-07 02:17:14,554 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data/394dcf58c/ab5ba67be073474cb220d30431f68dce/FLAGeea596be1 [2021-11-07 02:17:14,770 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data/394dcf58c/ab5ba67be073474cb220d30431f68dce [2021-11-07 02:17:14,772 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:17:14,773 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:17:14,781 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:17:14,782 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:17:14,785 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:17:14,785 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:17:14" (1/1) ... [2021-11-07 02:17:14,787 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@481b79bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:14, skipping insertion in model container [2021-11-07 02:17:14,787 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:17:14" (1/1) ... [2021-11-07 02:17:14,794 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:17:14,866 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:17:15,584 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/sv-benchmarks/c/product-lines/email_spec6_product28.cil.c[64121,64134] [2021-11-07 02:17:15,588 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:17:15,605 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 02:17:15,606 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@36cd3576 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:15, skipping insertion in model container [2021-11-07 02:17:15,606 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:17:15,607 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 02:17:15,609 INFO L168 Benchmark]: Toolchain (without parser) took 834.96 ms. Allocated memory is still 121.6 MB. Free memory was 78.3 MB in the beginning and 83.8 MB in the end (delta: -5.6 MB). Peak memory consumption was 10.9 MB. Max. memory is 16.1 GB. [2021-11-07 02:17:15,611 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 121.6 MB. Free memory is still 97.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:17:15,613 INFO L168 Benchmark]: CACSL2BoogieTranslator took 825.61 ms. Allocated memory is still 121.6 MB. Free memory was 78.1 MB in the beginning and 83.8 MB in the end (delta: -5.8 MB). Peak memory consumption was 10.9 MB. Max. memory is 16.1 GB. [2021-11-07 02:17:15,615 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 121.6 MB. Free memory is still 97.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 825.61 ms. Allocated memory is still 121.6 MB. Free memory was 78.1 MB in the beginning and 83.8 MB in the end (delta: -5.8 MB). Peak memory consumption was 10.9 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 862]: 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_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/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_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec6_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 21774f07edc6bb728cb664e1a2361d7b986cd58290bb234c442a42ac18f35f10 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:17:17,823 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:17:17,825 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:17:17,875 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:17:17,875 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:17:17,881 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:17:17,883 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:17:17,891 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:17:17,894 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:17:17,902 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:17:17,903 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:17:17,905 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:17:17,906 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:17:17,909 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:17:17,911 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:17:17,916 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:17:17,917 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:17:17,918 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:17:17,921 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:17:17,930 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:17:17,932 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:17:17,934 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:17:17,941 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:17:17,943 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:17:17,952 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:17:17,953 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:17:17,953 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:17:17,955 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:17:17,956 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:17:17,957 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:17:17,958 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:17:17,959 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:17:17,961 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:17:17,963 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:17:17,964 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:17:17,965 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:17:17,966 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:17:17,966 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:17:17,966 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:17:17,968 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:17:17,969 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:17:17,970 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 02:17:18,012 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:17:18,013 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:17:18,014 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:17:18,014 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:17:18,014 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:17:18,014 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:17:18,015 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:17:18,015 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:17:18,015 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:17:18,016 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:17:18,016 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:17:18,016 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:17:18,017 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:17:18,017 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:17:18,017 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:17:18,017 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:17:18,017 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:17:18,018 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 02:17:18,018 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 02:17:18,018 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:17:18,018 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:17:18,018 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:17:18,019 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:17:18,019 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:17:18,019 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 02:17:18,019 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:17:18,020 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:17:18,020 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:17:18,020 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:17:18,020 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:17:18,021 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 02:17:18,021 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 02:17:18,021 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:17:18,021 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:17:18,022 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:17:18,022 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_7d39fa51-512b-4efb-8a34-52a0a9fa356a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 21774f07edc6bb728cb664e1a2361d7b986cd58290bb234c442a42ac18f35f10 [2021-11-07 02:17:18,426 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:17:18,464 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:17:18,467 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:17:18,469 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:17:18,470 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:17:18,471 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec6_product28.cil.c [2021-11-07 02:17:18,551 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data/ffa30708d/00dc673a0eb7413b93fbb72556dccd3d/FLAG6e94a04bb [2021-11-07 02:17:19,281 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:17:19,281 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/sv-benchmarks/c/product-lines/email_spec6_product28.cil.c [2021-11-07 02:17:19,306 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data/ffa30708d/00dc673a0eb7413b93fbb72556dccd3d/FLAG6e94a04bb [2021-11-07 02:17:19,457 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/data/ffa30708d/00dc673a0eb7413b93fbb72556dccd3d [2021-11-07 02:17:19,459 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:17:19,461 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:17:19,470 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:17:19,470 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:17:19,473 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:17:19,475 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:17:19" (1/1) ... [2021-11-07 02:17:19,476 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26a2d49b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:19, skipping insertion in model container [2021-11-07 02:17:19,479 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:17:19" (1/1) ... [2021-11-07 02:17:19,486 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:17:19,576 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:17:20,141 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/sv-benchmarks/c/product-lines/email_spec6_product28.cil.c[64121,64134] [2021-11-07 02:17:20,157 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:17:20,176 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 02:17:20,198 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:17:20,280 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/sv-benchmarks/c/product-lines/email_spec6_product28.cil.c[64121,64134] [2021-11-07 02:17:20,287 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:17:20,303 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:17:20,451 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/sv-benchmarks/c/product-lines/email_spec6_product28.cil.c[64121,64134] [2021-11-07 02:17:20,453 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:17:20,505 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:17:20,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20 WrapperNode [2021-11-07 02:17:20,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:17:20,507 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:17:20,507 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:17:20,507 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:17:20,515 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,569 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,677 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:17:20,679 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:17:20,680 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:17:20,680 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:17:20,689 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,689 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,707 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,707 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,784 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,835 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,842 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,855 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:17:20,856 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:17:20,857 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:17:20,857 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:17:20,858 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (1/1) ... [2021-11-07 02:17:20,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:17:20,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:17:20,890 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:17:20,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:17:20,954 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 02:17:20,954 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:17:20,955 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 02:17:20,955 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:17:20,955 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:17:25,468 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:17:25,468 INFO L299 CfgBuilder]: Removed 303 assume(true) statements. [2021-11-07 02:17:25,471 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:17:25 BoogieIcfgContainer [2021-11-07 02:17:25,471 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:17:25,473 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:17:25,473 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:17:25,476 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:17:25,477 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:17:19" (1/3) ... [2021-11-07 02:17:25,477 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@522dd0aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:17:25, skipping insertion in model container [2021-11-07 02:17:25,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:17:20" (2/3) ... [2021-11-07 02:17:25,478 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@522dd0aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:17:25, skipping insertion in model container [2021-11-07 02:17:25,478 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:17:25" (3/3) ... [2021-11-07 02:17:25,479 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec6_product28.cil.c [2021-11-07 02:17:25,498 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:17:25,498 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 02:17:25,565 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:17:25,574 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 02:17:25,574 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 02:17:25,609 INFO L276 IsEmpty]: Start isEmpty. Operand has 491 states, 488 states have (on average 1.7602459016393444) internal successors, (859), 490 states have internal predecessors, (859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:25,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 02:17:25,639 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:25,640 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:25,640 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:25,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:25,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1553502511, now seen corresponding path program 1 times [2021-11-07 02:17:25,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:25,663 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [526152327] [2021-11-07 02:17:25,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:25,664 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:25,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:25,671 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:25,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 02:17:26,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:26,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 02:17:26,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:26,425 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 02:17:26,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:26,564 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 02:17:26,577 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:26,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [526152327] [2021-11-07 02:17:26,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [526152327] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:26,578 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:26,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 02:17:26,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004740856] [2021-11-07 02:17:26,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 02:17:26,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:26,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 02:17:26,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 02:17:26,608 INFO L87 Difference]: Start difference. First operand has 491 states, 488 states have (on average 1.7602459016393444) internal successors, (859), 490 states have internal predecessors, (859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 27.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:26,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:26,689 INFO L93 Difference]: Finished difference Result 744 states and 1284 transitions. [2021-11-07 02:17:26,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 02:17:26,691 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 27.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-07 02:17:26,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:26,716 INFO L225 Difference]: With dead ends: 744 [2021-11-07 02:17:26,716 INFO L226 Difference]: Without dead ends: 428 [2021-11-07 02:17:26,723 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 02:17:26,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-11-07 02:17:26,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 428. [2021-11-07 02:17:26,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 426 states have (on average 1.7535211267605635) internal successors, (747), 427 states have internal predecessors, (747), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:26,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 747 transitions. [2021-11-07 02:17:26,815 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 747 transitions. Word has length 54 [2021-11-07 02:17:26,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:26,816 INFO L470 AbstractCegarLoop]: Abstraction has 428 states and 747 transitions. [2021-11-07 02:17:26,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 27.0) internal successors, (54), 2 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:26,816 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 747 transitions. [2021-11-07 02:17:26,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 02:17:26,826 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:26,826 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:26,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:27,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:27,041 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:27,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:27,042 INFO L85 PathProgramCache]: Analyzing trace with hash 2132460027, now seen corresponding path program 1 times [2021-11-07 02:17:27,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:27,043 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1300489452] [2021-11-07 02:17:27,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:27,043 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:27,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:27,045 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:27,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 02:17:27,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:27,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:17:27,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:27,624 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 02:17:27,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:27,834 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 02:17:27,834 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:27,835 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1300489452] [2021-11-07 02:17:27,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1300489452] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:27,835 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:27,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:17:27,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610004417] [2021-11-07 02:17:27,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:27,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:27,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:27,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:27,838 INFO L87 Difference]: Start difference. First operand 428 states and 747 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:27,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:27,956 INFO L93 Difference]: Finished difference Result 1254 states and 2193 transitions. [2021-11-07 02:17:27,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:27,956 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-07 02:17:27,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:27,964 INFO L225 Difference]: With dead ends: 1254 [2021-11-07 02:17:27,965 INFO L226 Difference]: Without dead ends: 841 [2021-11-07 02:17:27,967 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:27,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 841 states. [2021-11-07 02:17:27,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 841 to 427. [2021-11-07 02:17:27,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 425 states have (on average 1.7458823529411764) internal successors, (742), 426 states have internal predecessors, (742), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:28,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 742 transitions. [2021-11-07 02:17:28,001 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 742 transitions. Word has length 55 [2021-11-07 02:17:28,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:28,002 INFO L470 AbstractCegarLoop]: Abstraction has 427 states and 742 transitions. [2021-11-07 02:17:28,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:28,002 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 742 transitions. [2021-11-07 02:17:28,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 02:17:28,004 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:28,004 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:28,019 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-07 02:17:28,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:28,218 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:28,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:28,219 INFO L85 PathProgramCache]: Analyzing trace with hash -1130708767, now seen corresponding path program 1 times [2021-11-07 02:17:28,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:28,221 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1298643499] [2021-11-07 02:17:28,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:28,221 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:28,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:28,222 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:28,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 02:17:28,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:28,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:17:28,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:28,855 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 02:17:28,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:29,030 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 02:17:29,030 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:29,030 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1298643499] [2021-11-07 02:17:29,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1298643499] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:29,031 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:29,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:17:29,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453849678] [2021-11-07 02:17:29,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:17:29,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:29,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:17:29,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:17:29,033 INFO L87 Difference]: Start difference. First operand 427 states and 742 transitions. Second operand has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:29,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:29,264 INFO L93 Difference]: Finished difference Result 1625 states and 2830 transitions. [2021-11-07 02:17:29,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:17:29,265 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-07 02:17:29,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:29,276 INFO L225 Difference]: With dead ends: 1625 [2021-11-07 02:17:29,276 INFO L226 Difference]: Without dead ends: 1216 [2021-11-07 02:17:29,277 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:17:29,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1216 states. [2021-11-07 02:17:29,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1216 to 426. [2021-11-07 02:17:29,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 424 states have (on average 1.740566037735849) internal successors, (738), 425 states have internal predecessors, (738), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:29,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 738 transitions. [2021-11-07 02:17:29,327 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 738 transitions. Word has length 57 [2021-11-07 02:17:29,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:29,327 INFO L470 AbstractCegarLoop]: Abstraction has 426 states and 738 transitions. [2021-11-07 02:17:29,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 6 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:29,329 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 738 transitions. [2021-11-07 02:17:29,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-07 02:17:29,333 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:29,334 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:29,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:29,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:29,557 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:29,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:29,558 INFO L85 PathProgramCache]: Analyzing trace with hash -160941516, now seen corresponding path program 1 times [2021-11-07 02:17:29,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:29,559 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1017759573] [2021-11-07 02:17:29,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:29,560 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:29,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:29,562 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:29,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 02:17:29,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:30,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:17:30,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:30,190 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 02:17:30,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:30,350 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 02:17:30,351 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:30,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1017759573] [2021-11-07 02:17:30,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1017759573] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:30,351 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:30,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:17:30,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421982885] [2021-11-07 02:17:30,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:30,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:30,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:30,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:30,353 INFO L87 Difference]: Start difference. First operand 426 states and 738 transitions. Second operand has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:30,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:30,419 INFO L93 Difference]: Finished difference Result 849 states and 1473 transitions. [2021-11-07 02:17:30,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:30,420 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-07 02:17:30,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:30,423 INFO L225 Difference]: With dead ends: 849 [2021-11-07 02:17:30,424 INFO L226 Difference]: Without dead ends: 431 [2021-11-07 02:17:30,425 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:30,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2021-11-07 02:17:30,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 426. [2021-11-07 02:17:30,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 424 states have (on average 1.7334905660377358) internal successors, (735), 425 states have internal predecessors, (735), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:30,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 735 transitions. [2021-11-07 02:17:30,462 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 735 transitions. Word has length 58 [2021-11-07 02:17:30,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:30,464 INFO L470 AbstractCegarLoop]: Abstraction has 426 states and 735 transitions. [2021-11-07 02:17:30,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:30,464 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 735 transitions. [2021-11-07 02:17:30,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-07 02:17:30,467 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:30,467 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:30,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:30,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:30,682 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:30,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:30,683 INFO L85 PathProgramCache]: Analyzing trace with hash -1776128567, now seen corresponding path program 1 times [2021-11-07 02:17:30,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:30,684 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [545634301] [2021-11-07 02:17:30,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:30,684 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:30,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:30,686 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:30,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 02:17:31,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:31,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:17:31,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:31,350 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 02:17:31,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:31,526 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 02:17:31,527 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:31,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [545634301] [2021-11-07 02:17:31,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [545634301] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:31,527 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:31,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:17:31,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812329172] [2021-11-07 02:17:31,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:17:31,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:31,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:17:31,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:17:31,529 INFO L87 Difference]: Start difference. First operand 426 states and 735 transitions. Second operand has 6 states, 6 states have (on average 10.833333333333334) internal successors, (65), 6 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:31,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:31,773 INFO L93 Difference]: Finished difference Result 1612 states and 2806 transitions. [2021-11-07 02:17:31,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:17:31,774 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.833333333333334) internal successors, (65), 6 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-07 02:17:31,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:31,782 INFO L225 Difference]: With dead ends: 1612 [2021-11-07 02:17:31,783 INFO L226 Difference]: Without dead ends: 1212 [2021-11-07 02:17:31,784 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:17:31,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1212 states. [2021-11-07 02:17:31,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1212 to 426. [2021-11-07 02:17:31,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 424 states have (on average 1.7264150943396226) internal successors, (732), 425 states have internal predecessors, (732), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:31,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 732 transitions. [2021-11-07 02:17:31,831 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 732 transitions. Word has length 59 [2021-11-07 02:17:31,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:31,832 INFO L470 AbstractCegarLoop]: Abstraction has 426 states and 732 transitions. [2021-11-07 02:17:31,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.833333333333334) internal successors, (65), 6 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:31,832 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 732 transitions. [2021-11-07 02:17:31,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-07 02:17:31,834 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:31,834 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:31,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:32,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:32,050 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:32,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:32,050 INFO L85 PathProgramCache]: Analyzing trace with hash -845310332, now seen corresponding path program 1 times [2021-11-07 02:17:32,051 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:32,051 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2031180964] [2021-11-07 02:17:32,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:32,051 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:32,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:32,053 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:32,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 02:17:32,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:32,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:17:32,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:32,779 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 02:17:32,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:32,941 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 02:17:32,941 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:32,941 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2031180964] [2021-11-07 02:17:32,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2031180964] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:32,942 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:32,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:17:32,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678265847] [2021-11-07 02:17:32,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:32,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:32,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:32,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:32,943 INFO L87 Difference]: Start difference. First operand 426 states and 732 transitions. Second operand has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:33,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:33,024 INFO L93 Difference]: Finished difference Result 1016 states and 1750 transitions. [2021-11-07 02:17:33,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:17:33,025 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-07 02:17:33,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:33,030 INFO L225 Difference]: With dead ends: 1016 [2021-11-07 02:17:33,031 INFO L226 Difference]: Without dead ends: 826 [2021-11-07 02:17:33,032 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:33,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 826 states. [2021-11-07 02:17:33,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 826 to 636. [2021-11-07 02:17:33,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 636 states, 634 states have (on average 1.7602523659305993) internal successors, (1116), 635 states have internal predecessors, (1116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:33,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 636 states to 636 states and 1116 transitions. [2021-11-07 02:17:33,100 INFO L78 Accepts]: Start accepts. Automaton has 636 states and 1116 transitions. Word has length 61 [2021-11-07 02:17:33,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:33,101 INFO L470 AbstractCegarLoop]: Abstraction has 636 states and 1116 transitions. [2021-11-07 02:17:33,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:33,101 INFO L276 IsEmpty]: Start isEmpty. Operand 636 states and 1116 transitions. [2021-11-07 02:17:33,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 02:17:33,103 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:33,103 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:33,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:33,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:33,318 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:33,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:33,318 INFO L85 PathProgramCache]: Analyzing trace with hash -1033122507, now seen corresponding path program 1 times [2021-11-07 02:17:33,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:33,319 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [192005900] [2021-11-07 02:17:33,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:33,319 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:33,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:33,321 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:33,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 02:17:33,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:33,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 523 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:17:33,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:34,062 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 02:17:34,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:34,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:34,236 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:34,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [192005900] [2021-11-07 02:17:34,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [192005900] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:34,236 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:34,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:17:34,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559197121] [2021-11-07 02:17:34,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:17:34,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:34,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:17:34,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:34,238 INFO L87 Difference]: Start difference. First operand 636 states and 1116 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:34,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:34,323 INFO L93 Difference]: Finished difference Result 1536 states and 2703 transitions. [2021-11-07 02:17:34,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:17:34,324 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 02:17:34,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:34,330 INFO L225 Difference]: With dead ends: 1536 [2021-11-07 02:17:34,330 INFO L226 Difference]: Without dead ends: 984 [2021-11-07 02:17:34,332 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:34,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2021-11-07 02:17:34,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 794. [2021-11-07 02:17:34,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 794 states, 792 states have (on average 1.7714646464646464) internal successors, (1403), 793 states have internal predecessors, (1403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:34,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 794 states to 794 states and 1403 transitions. [2021-11-07 02:17:34,399 INFO L78 Accepts]: Start accepts. Automaton has 794 states and 1403 transitions. Word has length 73 [2021-11-07 02:17:34,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:34,400 INFO L470 AbstractCegarLoop]: Abstraction has 794 states and 1403 transitions. [2021-11-07 02:17:34,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:34,400 INFO L276 IsEmpty]: Start isEmpty. Operand 794 states and 1403 transitions. [2021-11-07 02:17:34,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 02:17:34,403 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:34,403 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:34,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:34,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:34,616 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:34,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:34,617 INFO L85 PathProgramCache]: Analyzing trace with hash -1207837100, now seen corresponding path program 1 times [2021-11-07 02:17:34,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:34,617 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1359762660] [2021-11-07 02:17:34,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:34,618 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:34,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:34,621 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:34,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 02:17:35,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:35,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 525 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:17:35,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:35,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:35,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:35,532 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 02:17:35,533 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:35,533 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1359762660] [2021-11-07 02:17:35,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1359762660] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:35,533 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:35,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:17:35,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753004373] [2021-11-07 02:17:35,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:17:35,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:35,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:17:35,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:35,535 INFO L87 Difference]: Start difference. First operand 794 states and 1403 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:35,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:35,660 INFO L93 Difference]: Finished difference Result 2054 states and 3650 transitions. [2021-11-07 02:17:35,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:17:35,660 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 02:17:35,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:35,669 INFO L225 Difference]: With dead ends: 2054 [2021-11-07 02:17:35,669 INFO L226 Difference]: Without dead ends: 1348 [2021-11-07 02:17:35,672 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:35,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1348 states. [2021-11-07 02:17:35,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1348 to 1158. [2021-11-07 02:17:35,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1158 states, 1156 states have (on average 1.7880622837370241) internal successors, (2067), 1157 states have internal predecessors, (2067), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:35,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1158 states to 1158 states and 2067 transitions. [2021-11-07 02:17:35,765 INFO L78 Accepts]: Start accepts. Automaton has 1158 states and 2067 transitions. Word has length 74 [2021-11-07 02:17:35,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:35,766 INFO L470 AbstractCegarLoop]: Abstraction has 1158 states and 2067 transitions. [2021-11-07 02:17:35,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:35,766 INFO L276 IsEmpty]: Start isEmpty. Operand 1158 states and 2067 transitions. [2021-11-07 02:17:35,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 02:17:35,774 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:35,775 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:35,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-07 02:17:35,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:35,991 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:35,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:35,991 INFO L85 PathProgramCache]: Analyzing trace with hash 473388004, now seen corresponding path program 1 times [2021-11-07 02:17:35,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:35,992 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [277832707] [2021-11-07 02:17:35,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:35,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:35,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:35,993 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:35,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 02:17:36,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:36,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:17:36,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:36,737 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:36,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:36,905 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:36,905 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:36,905 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [277832707] [2021-11-07 02:17:36,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [277832707] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:36,906 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:36,906 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:17:36,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856621392] [2021-11-07 02:17:36,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:17:36,907 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:36,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:17:36,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:36,907 INFO L87 Difference]: Start difference. First operand 1158 states and 2067 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:37,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:37,051 INFO L93 Difference]: Finished difference Result 2264 states and 4031 transitions. [2021-11-07 02:17:37,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:17:37,052 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 02:17:37,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:37,061 INFO L225 Difference]: With dead ends: 2264 [2021-11-07 02:17:37,062 INFO L226 Difference]: Without dead ends: 1348 [2021-11-07 02:17:37,066 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:17:37,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1348 states. [2021-11-07 02:17:37,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1348 to 1158. [2021-11-07 02:17:37,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1158 states, 1156 states have (on average 1.7863321799307958) internal successors, (2065), 1157 states have internal predecessors, (2065), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:37,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1158 states to 1158 states and 2065 transitions. [2021-11-07 02:17:37,167 INFO L78 Accepts]: Start accepts. Automaton has 1158 states and 2065 transitions. Word has length 75 [2021-11-07 02:17:37,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:37,167 INFO L470 AbstractCegarLoop]: Abstraction has 1158 states and 2065 transitions. [2021-11-07 02:17:37,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:37,168 INFO L276 IsEmpty]: Start isEmpty. Operand 1158 states and 2065 transitions. [2021-11-07 02:17:37,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 02:17:37,171 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:37,171 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:37,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:37,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:37,386 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:37,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:37,386 INFO L85 PathProgramCache]: Analyzing trace with hash -2048550941, now seen corresponding path program 1 times [2021-11-07 02:17:37,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:37,387 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [627997387] [2021-11-07 02:17:37,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:37,387 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:37,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:37,388 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:37,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 02:17:37,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:37,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:17:37,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:38,056 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 02:17:38,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:38,229 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 02:17:38,229 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:38,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [627997387] [2021-11-07 02:17:38,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [627997387] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:38,230 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:38,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:17:38,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645590278] [2021-11-07 02:17:38,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:17:38,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:38,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:17:38,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:38,231 INFO L87 Difference]: Start difference. First operand 1158 states and 2065 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:38,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:38,411 INFO L93 Difference]: Finished difference Result 3118 states and 5591 transitions. [2021-11-07 02:17:38,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:17:38,411 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 02:17:38,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:38,424 INFO L225 Difference]: With dead ends: 3118 [2021-11-07 02:17:38,424 INFO L226 Difference]: Without dead ends: 2056 [2021-11-07 02:17:38,426 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:38,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2056 states. [2021-11-07 02:17:38,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2056 to 1866. [2021-11-07 02:17:38,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1866 states, 1864 states have (on average 1.8004291845493563) internal successors, (3356), 1865 states have internal predecessors, (3356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:38,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1866 states to 1866 states and 3356 transitions. [2021-11-07 02:17:38,569 INFO L78 Accepts]: Start accepts. Automaton has 1866 states and 3356 transitions. Word has length 75 [2021-11-07 02:17:38,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:38,569 INFO L470 AbstractCegarLoop]: Abstraction has 1866 states and 3356 transitions. [2021-11-07 02:17:38,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:38,570 INFO L276 IsEmpty]: Start isEmpty. Operand 1866 states and 3356 transitions. [2021-11-07 02:17:38,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 02:17:38,575 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:38,575 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:38,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:38,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:38,791 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:38,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:38,792 INFO L85 PathProgramCache]: Analyzing trace with hash 836080278, now seen corresponding path program 1 times [2021-11-07 02:17:38,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:38,792 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2085519127] [2021-11-07 02:17:38,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:38,793 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:38,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:38,793 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:38,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 02:17:39,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:39,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:17:39,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:39,517 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 02:17:39,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:39,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:39,690 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:39,690 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2085519127] [2021-11-07 02:17:39,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2085519127] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:39,690 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:39,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:17:39,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164171326] [2021-11-07 02:17:39,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:17:39,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:39,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:17:39,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:39,692 INFO L87 Difference]: Start difference. First operand 1866 states and 3356 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:39,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:39,934 INFO L93 Difference]: Finished difference Result 4978 states and 8983 transitions. [2021-11-07 02:17:39,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:17:39,935 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-07 02:17:39,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:39,957 INFO L225 Difference]: With dead ends: 4978 [2021-11-07 02:17:39,957 INFO L226 Difference]: Without dead ends: 3242 [2021-11-07 02:17:39,961 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:39,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3242 states. [2021-11-07 02:17:40,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3242 to 3052. [2021-11-07 02:17:40,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3052 states, 3050 states have (on average 1.8075409836065575) internal successors, (5513), 3051 states have internal predecessors, (5513), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:40,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3052 states to 3052 states and 5513 transitions. [2021-11-07 02:17:40,198 INFO L78 Accepts]: Start accepts. Automaton has 3052 states and 5513 transitions. Word has length 76 [2021-11-07 02:17:40,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:40,199 INFO L470 AbstractCegarLoop]: Abstraction has 3052 states and 5513 transitions. [2021-11-07 02:17:40,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:40,199 INFO L276 IsEmpty]: Start isEmpty. Operand 3052 states and 5513 transitions. [2021-11-07 02:17:40,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-07 02:17:40,205 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:40,206 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:40,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:40,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:40,421 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:40,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:40,421 INFO L85 PathProgramCache]: Analyzing trace with hash -141818060, now seen corresponding path program 1 times [2021-11-07 02:17:40,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:40,422 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1433218756] [2021-11-07 02:17:40,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:40,422 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:40,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:40,423 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:40,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 02:17:40,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:40,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:17:40,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:41,169 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 02:17:41,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:41,388 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 02:17:41,388 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:41,388 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1433218756] [2021-11-07 02:17:41,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1433218756] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:41,389 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:41,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:17:41,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171213105] [2021-11-07 02:17:41,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:17:41,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:41,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:17:41,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:41,391 INFO L87 Difference]: Start difference. First operand 3052 states and 5513 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:41,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:41,697 INFO L93 Difference]: Finished difference Result 8252 states and 14937 transitions. [2021-11-07 02:17:41,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:17:41,698 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-07 02:17:41,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:41,732 INFO L225 Difference]: With dead ends: 8252 [2021-11-07 02:17:41,733 INFO L226 Difference]: Without dead ends: 5364 [2021-11-07 02:17:41,738 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:41,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5364 states. [2021-11-07 02:17:42,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5364 to 5174. [2021-11-07 02:17:42,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5174 states, 5172 states have (on average 1.8101314771848414) internal successors, (9362), 5173 states have internal predecessors, (9362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:42,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5174 states to 5174 states and 9362 transitions. [2021-11-07 02:17:42,145 INFO L78 Accepts]: Start accepts. Automaton has 5174 states and 9362 transitions. Word has length 77 [2021-11-07 02:17:42,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:42,146 INFO L470 AbstractCegarLoop]: Abstraction has 5174 states and 9362 transitions. [2021-11-07 02:17:42,146 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:42,146 INFO L276 IsEmpty]: Start isEmpty. Operand 5174 states and 9362 transitions. [2021-11-07 02:17:42,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 02:17:42,156 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:42,156 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:42,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:42,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:42,369 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:42,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:42,370 INFO L85 PathProgramCache]: Analyzing trace with hash 1438177336, now seen corresponding path program 1 times [2021-11-07 02:17:42,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:42,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [504618866] [2021-11-07 02:17:42,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:42,371 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:42,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:42,372 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:42,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 02:17:43,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:43,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:17:43,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:43,262 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:17:43,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:43,502 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:17:43,502 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:43,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [504618866] [2021-11-07 02:17:43,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [504618866] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:43,502 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:43,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:17:43,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856692335] [2021-11-07 02:17:43,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:17:43,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:43,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:17:43,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:17:43,505 INFO L87 Difference]: Start difference. First operand 5174 states and 9362 transitions. Second operand has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:46,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:46,588 INFO L93 Difference]: Finished difference Result 19348 states and 35050 transitions. [2021-11-07 02:17:46,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:17:46,589 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-07 02:17:46,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:46,666 INFO L225 Difference]: With dead ends: 19348 [2021-11-07 02:17:46,666 INFO L226 Difference]: Without dead ends: 14414 [2021-11-07 02:17:46,675 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:17:46,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14414 states. [2021-11-07 02:17:47,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14414 to 5124. [2021-11-07 02:17:47,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5124 states, 5122 states have (on average 1.7887543928153065) internal successors, (9162), 5123 states have internal predecessors, (9162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:47,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5124 states to 5124 states and 9162 transitions. [2021-11-07 02:17:47,183 INFO L78 Accepts]: Start accepts. Automaton has 5124 states and 9162 transitions. Word has length 78 [2021-11-07 02:17:47,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:47,184 INFO L470 AbstractCegarLoop]: Abstraction has 5124 states and 9162 transitions. [2021-11-07 02:17:47,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.666666666666668) internal successors, (100), 6 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:47,185 INFO L276 IsEmpty]: Start isEmpty. Operand 5124 states and 9162 transitions. [2021-11-07 02:17:47,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 02:17:47,192 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:47,192 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:47,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:47,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:47,405 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:47,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:47,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1769371641, now seen corresponding path program 1 times [2021-11-07 02:17:47,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:47,406 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1761381414] [2021-11-07 02:17:47,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:47,406 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:47,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:47,407 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:47,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 02:17:48,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:48,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:17:48,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:48,254 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 02:17:48,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:48,433 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 02:17:48,434 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:48,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1761381414] [2021-11-07 02:17:48,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1761381414] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:48,434 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:17:48,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:17:48,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046308099] [2021-11-07 02:17:48,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:17:48,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:48,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:17:48,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:48,436 INFO L87 Difference]: Start difference. First operand 5124 states and 9162 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:48,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:48,945 INFO L93 Difference]: Finished difference Result 14929 states and 26738 transitions. [2021-11-07 02:17:48,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:17:48,945 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-07 02:17:48,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:48,971 INFO L225 Difference]: With dead ends: 14929 [2021-11-07 02:17:48,972 INFO L226 Difference]: Without dead ends: 9972 [2021-11-07 02:17:48,979 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:17:48,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9972 states. [2021-11-07 02:17:49,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9972 to 9782. [2021-11-07 02:17:49,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9782 states, 9780 states have (on average 1.7892638036809816) internal successors, (17499), 9781 states have internal predecessors, (17499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:49,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9782 states to 9782 states and 17499 transitions. [2021-11-07 02:17:49,562 INFO L78 Accepts]: Start accepts. Automaton has 9782 states and 17499 transitions. Word has length 78 [2021-11-07 02:17:49,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:49,562 INFO L470 AbstractCegarLoop]: Abstraction has 9782 states and 17499 transitions. [2021-11-07 02:17:49,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:49,562 INFO L276 IsEmpty]: Start isEmpty. Operand 9782 states and 17499 transitions. [2021-11-07 02:17:49,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 02:17:49,573 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:49,574 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:49,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 02:17:49,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:17:49,790 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:17:49,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:17:49,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1938561293, now seen corresponding path program 1 times [2021-11-07 02:17:49,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:17:49,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [244980909] [2021-11-07 02:17:49,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:49,792 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:17:49,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:17:49,792 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:17:49,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 02:17:50,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:50,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:17:50,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:50,648 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:50,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:50,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:17:50,904 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:17:50,904 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [244980909] [2021-11-07 02:17:50,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [244980909] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:17:50,905 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [502483114] [2021-11-07 02:17:50,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:17:50,905 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:17:50,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:17:50,911 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:17:50,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 02:17:51,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:17:51,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:17:51,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:17:52,132 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:17:52,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:17:52,408 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:17:52,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [502483114] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:17:52,408 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:17:52,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 02:17:52,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408617459] [2021-11-07 02:17:52,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:17:52,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:17:52,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:17:52,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:17:52,410 INFO L87 Difference]: Start difference. First operand 9782 states and 17499 transitions. Second operand has 10 states, 10 states have (on average 11.4) internal successors, (114), 10 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:58,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:17:58,189 INFO L93 Difference]: Finished difference Result 58537 states and 105154 transitions. [2021-11-07 02:17:58,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 02:17:58,190 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 11.4) internal successors, (114), 10 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 02:17:58,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:17:58,339 INFO L225 Difference]: With dead ends: 58537 [2021-11-07 02:17:58,339 INFO L226 Difference]: Without dead ends: 58365 [2021-11-07 02:17:58,353 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 02:17:58,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58365 states. [2021-11-07 02:17:59,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58365 to 19496. [2021-11-07 02:17:59,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19496 states, 19494 states have (on average 1.7896788755514517) internal successors, (34888), 19495 states have internal predecessors, (34888), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:59,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19496 states to 19496 states and 34888 transitions. [2021-11-07 02:17:59,886 INFO L78 Accepts]: Start accepts. Automaton has 19496 states and 34888 transitions. Word has length 79 [2021-11-07 02:17:59,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:17:59,886 INFO L470 AbstractCegarLoop]: Abstraction has 19496 states and 34888 transitions. [2021-11-07 02:17:59,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 11.4) internal successors, (114), 10 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:17:59,887 INFO L276 IsEmpty]: Start isEmpty. Operand 19496 states and 34888 transitions. [2021-11-07 02:17:59,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 02:17:59,907 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:17:59,908 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:17:59,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:00,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:00,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:18:00,324 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:18:00,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:00,325 INFO L85 PathProgramCache]: Analyzing trace with hash -585524241, now seen corresponding path program 1 times [2021-11-07 02:18:00,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:00,325 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1970392912] [2021-11-07 02:18:00,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:00,326 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:00,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:00,326 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:00,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 02:18:01,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:01,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:18:01,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:01,238 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:01,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:01,470 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:01,470 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:01,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1970392912] [2021-11-07 02:18:01,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1970392912] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:18:01,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1661428522] [2021-11-07 02:18:01,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:01,471 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:18:01,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:18:01,471 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:18:01,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 02:18:02,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:02,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:18:02,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:02,682 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:02,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:02,921 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:02,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1661428522] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:02,921 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:18:02,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 02:18:02,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906970108] [2021-11-07 02:18:02,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:18:02,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:02,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:18:02,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:18:02,923 INFO L87 Difference]: Start difference. First operand 19496 states and 34888 transitions. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:06,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:06,165 INFO L93 Difference]: Finished difference Result 19987 states and 35699 transitions. [2021-11-07 02:18:06,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:18:06,165 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-07 02:18:06,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:06,217 INFO L225 Difference]: With dead ends: 19987 [2021-11-07 02:18:06,218 INFO L226 Difference]: Without dead ends: 19683 [2021-11-07 02:18:06,226 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:18:06,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19683 states. [2021-11-07 02:18:07,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19683 to 19490. [2021-11-07 02:18:07,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19490 states, 19488 states have (on average 1.7895628078817734) internal successors, (34875), 19489 states have internal predecessors, (34875), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:07,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19490 states to 19490 states and 34875 transitions. [2021-11-07 02:18:07,540 INFO L78 Accepts]: Start accepts. Automaton has 19490 states and 34875 transitions. Word has length 80 [2021-11-07 02:18:07,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:07,541 INFO L470 AbstractCegarLoop]: Abstraction has 19490 states and 34875 transitions. [2021-11-07 02:18:07,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:07,541 INFO L276 IsEmpty]: Start isEmpty. Operand 19490 states and 34875 transitions. [2021-11-07 02:18:07,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 02:18:07,561 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:07,561 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:07,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:07,777 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-07 02:18:07,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:18:07,967 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:18:07,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:07,968 INFO L85 PathProgramCache]: Analyzing trace with hash 1627206438, now seen corresponding path program 1 times [2021-11-07 02:18:07,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:07,968 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2120103452] [2021-11-07 02:18:07,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:07,968 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:07,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:07,969 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:07,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 02:18:08,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:08,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:18:08,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:08,922 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:08,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:09,100 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:09,100 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:09,100 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2120103452] [2021-11-07 02:18:09,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2120103452] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:09,101 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:18:09,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 02:18:09,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460275394] [2021-11-07 02:18:09,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:18:09,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:09,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:18:09,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:18:09,102 INFO L87 Difference]: Start difference. First operand 19490 states and 34875 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:10,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:10,358 INFO L93 Difference]: Finished difference Result 38084 states and 68369 transitions. [2021-11-07 02:18:10,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:18:10,359 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-07 02:18:10,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:10,393 INFO L225 Difference]: With dead ends: 38084 [2021-11-07 02:18:10,394 INFO L226 Difference]: Without dead ends: 18837 [2021-11-07 02:18:10,415 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:18:10,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18837 states. [2021-11-07 02:18:11,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18837 to 9780. [2021-11-07 02:18:11,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9780 states, 9778 states have (on average 1.7887093475148292) internal successors, (17490), 9779 states have internal predecessors, (17490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:11,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9780 states to 9780 states and 17490 transitions. [2021-11-07 02:18:11,292 INFO L78 Accepts]: Start accepts. Automaton has 9780 states and 17490 transitions. Word has length 80 [2021-11-07 02:18:11,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:11,293 INFO L470 AbstractCegarLoop]: Abstraction has 9780 states and 17490 transitions. [2021-11-07 02:18:11,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:11,293 INFO L276 IsEmpty]: Start isEmpty. Operand 9780 states and 17490 transitions. [2021-11-07 02:18:11,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-07 02:18:11,307 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:11,307 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:11,321 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Ended with exit code 0 [2021-11-07 02:18:11,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:18:11,509 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:18:11,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:11,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1644179267, now seen corresponding path program 1 times [2021-11-07 02:18:11,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:11,510 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1229504134] [2021-11-07 02:18:11,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:11,511 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:11,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:11,512 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:11,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 02:18:12,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:12,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:18:12,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:12,556 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:12,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:12,790 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:12,790 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:12,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1229504134] [2021-11-07 02:18:12,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1229504134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:18:12,791 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [70911061] [2021-11-07 02:18:12,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:12,791 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:18:12,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:18:12,792 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:18:12,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 02:18:13,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:13,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:18:13,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:14,709 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:14,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:15,184 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:15,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [70911061] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:15,184 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:18:15,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 02:18:15,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396434568] [2021-11-07 02:18:15,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:18:15,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:15,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:18:15,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:18:15,186 INFO L87 Difference]: Start difference. First operand 9780 states and 17490 transitions. Second operand has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:29,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:29,427 INFO L93 Difference]: Finished difference Result 20618 states and 36674 transitions. [2021-11-07 02:18:29,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 02:18:29,428 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-07 02:18:29,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:29,463 INFO L225 Difference]: With dead ends: 20618 [2021-11-07 02:18:29,463 INFO L226 Difference]: Without dead ends: 20457 [2021-11-07 02:18:29,471 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=212, Invalid=718, Unknown=0, NotChecked=0, Total=930 [2021-11-07 02:18:29,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20457 states. [2021-11-07 02:18:30,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20457 to 19354. [2021-11-07 02:18:30,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19354 states, 19352 states have (on average 1.7902542372881356) internal successors, (34645), 19353 states have internal predecessors, (34645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:30,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19354 states to 19354 states and 34645 transitions. [2021-11-07 02:18:30,746 INFO L78 Accepts]: Start accepts. Automaton has 19354 states and 34645 transitions. Word has length 82 [2021-11-07 02:18:30,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:30,747 INFO L470 AbstractCegarLoop]: Abstraction has 19354 states and 34645 transitions. [2021-11-07 02:18:30,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:30,747 INFO L276 IsEmpty]: Start isEmpty. Operand 19354 states and 34645 transitions. [2021-11-07 02:18:30,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 02:18:30,765 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:30,765 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:30,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:30,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:31,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:18:31,177 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:18:31,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:31,178 INFO L85 PathProgramCache]: Analyzing trace with hash 1929025293, now seen corresponding path program 1 times [2021-11-07 02:18:31,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:31,178 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1812166512] [2021-11-07 02:18:31,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:31,178 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:31,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:31,179 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:31,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 02:18:32,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:32,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:18:32,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:32,285 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:32,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:32,563 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:32,564 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:32,564 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1812166512] [2021-11-07 02:18:32,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1812166512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:18:32,564 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [384274377] [2021-11-07 02:18:32,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:32,564 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:18:32,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:18:32,569 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:18:32,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 02:18:33,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:33,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:18:33,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:34,514 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:34,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:34,914 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:34,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [384274377] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:34,914 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:18:34,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 02:18:34,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258232585] [2021-11-07 02:18:34,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:18:34,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:34,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:18:34,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:18:34,916 INFO L87 Difference]: Start difference. First operand 19354 states and 34645 transitions. Second operand has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:49,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:18:49,945 INFO L93 Difference]: Finished difference Result 40346 states and 71921 transitions. [2021-11-07 02:18:49,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 02:18:49,946 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-07 02:18:49,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:18:50,014 INFO L225 Difference]: With dead ends: 40346 [2021-11-07 02:18:50,015 INFO L226 Difference]: Without dead ends: 40070 [2021-11-07 02:18:50,026 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=212, Invalid=718, Unknown=0, NotChecked=0, Total=930 [2021-11-07 02:18:50,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40070 states. [2021-11-07 02:18:52,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40070 to 38421. [2021-11-07 02:18:52,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38421 states, 38419 states have (on average 1.7911189775892136) internal successors, (68813), 38420 states have internal predecessors, (68813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:52,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38421 states to 38421 states and 68813 transitions. [2021-11-07 02:18:52,578 INFO L78 Accepts]: Start accepts. Automaton has 38421 states and 68813 transitions. Word has length 83 [2021-11-07 02:18:52,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:18:52,578 INFO L470 AbstractCegarLoop]: Abstraction has 38421 states and 68813 transitions. [2021-11-07 02:18:52,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:18:52,579 INFO L276 IsEmpty]: Start isEmpty. Operand 38421 states and 68813 transitions. [2021-11-07 02:18:52,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 02:18:52,606 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:18:52,606 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:18:52,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:52,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 02:18:53,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:18:53,014 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:18:53,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:18:53,014 INFO L85 PathProgramCache]: Analyzing trace with hash -2147087285, now seen corresponding path program 1 times [2021-11-07 02:18:53,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:18:53,014 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1463084270] [2021-11-07 02:18:53,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:53,015 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:18:53,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:18:53,016 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:18:53,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 02:18:53,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:54,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:18:54,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:54,204 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:54,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:54,462 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:18:54,462 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:18:54,463 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1463084270] [2021-11-07 02:18:54,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1463084270] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:18:54,463 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [525672600] [2021-11-07 02:18:54,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:18:54,463 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:18:54,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:18:54,470 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:18:54,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 02:18:55,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:18:55,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:18:55,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:18:56,078 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:56,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:18:56,378 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:18:56,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [525672600] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:18:56,379 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:18:56,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 14 [2021-11-07 02:18:56,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407930107] [2021-11-07 02:18:56,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:18:56,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:18:56,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:18:56,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:18:56,381 INFO L87 Difference]: Start difference. First operand 38421 states and 68813 transitions. Second operand has 8 states, 8 states have (on average 18.25) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:01,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:19:01,308 INFO L93 Difference]: Finished difference Result 42631 states and 75725 transitions. [2021-11-07 02:19:01,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 02:19:01,308 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 18.25) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-07 02:19:01,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:19:01,375 INFO L225 Difference]: With dead ends: 42631 [2021-11-07 02:19:01,375 INFO L226 Difference]: Without dead ends: 42200 [2021-11-07 02:19:01,385 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 316 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-11-07 02:19:01,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42200 states. [2021-11-07 02:19:04,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42200 to 38926. [2021-11-07 02:19:04,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38926 states, 38924 states have (on average 1.7889476929400885) internal successors, (69633), 38925 states have internal predecessors, (69633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:04,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38926 states to 38926 states and 69633 transitions. [2021-11-07 02:19:04,440 INFO L78 Accepts]: Start accepts. Automaton has 38926 states and 69633 transitions. Word has length 83 [2021-11-07 02:19:04,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:19:04,440 INFO L470 AbstractCegarLoop]: Abstraction has 38926 states and 69633 transitions. [2021-11-07 02:19:04,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 18.25) internal successors, (146), 7 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:04,441 INFO L276 IsEmpty]: Start isEmpty. Operand 38926 states and 69633 transitions. [2021-11-07 02:19:04,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-07 02:19:04,461 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:19:04,461 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:19:04,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 02:19:04,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 02:19:04,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:19:04,862 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:19:04,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:19:04,862 INFO L85 PathProgramCache]: Analyzing trace with hash -2036394493, now seen corresponding path program 1 times [2021-11-07 02:19:04,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:19:04,863 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1169391535] [2021-11-07 02:19:04,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:04,863 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:19:04,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:19:04,864 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:19:04,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 02:19:06,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:06,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:19:06,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:06,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:06,596 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:06,597 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:19:06,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1169391535] [2021-11-07 02:19:06,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1169391535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:19:06,597 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1137113644] [2021-11-07 02:19:06,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:06,598 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:19:06,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:19:06,599 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:19:06,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 02:19:08,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:08,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-07 02:19:08,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:08,340 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:08,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:08,523 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:08,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1137113644] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:19:08,523 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:19:08,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 14 [2021-11-07 02:19:08,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660106320] [2021-11-07 02:19:08,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:19:08,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:19:08,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:19:08,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:19:08,525 INFO L87 Difference]: Start difference. First operand 38926 states and 69633 transitions. Second operand has 8 states, 8 states have (on average 9.75) internal successors, (78), 8 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:11,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:19:11,329 INFO L93 Difference]: Finished difference Result 40373 states and 71996 transitions. [2021-11-07 02:19:11,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 02:19:11,330 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.75) internal successors, (78), 8 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-07 02:19:11,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:19:11,398 INFO L225 Difference]: With dead ends: 40373 [2021-11-07 02:19:11,398 INFO L226 Difference]: Without dead ends: 39461 [2021-11-07 02:19:11,408 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2021-11-07 02:19:11,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39461 states. [2021-11-07 02:19:13,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39461 to 38826. [2021-11-07 02:19:13,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38826 states, 38824 states have (on average 1.7892283123840924) internal successors, (69465), 38825 states have internal predecessors, (69465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:14,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38826 states to 38826 states and 69465 transitions. [2021-11-07 02:19:14,047 INFO L78 Accepts]: Start accepts. Automaton has 38826 states and 69465 transitions. Word has length 84 [2021-11-07 02:19:14,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:19:14,047 INFO L470 AbstractCegarLoop]: Abstraction has 38826 states and 69465 transitions. [2021-11-07 02:19:14,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 9.75) internal successors, (78), 8 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:14,047 INFO L276 IsEmpty]: Start isEmpty. Operand 38826 states and 69465 transitions. [2021-11-07 02:19:14,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 02:19:14,075 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:19:14,076 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:19:14,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 02:19:14,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 02:19:14,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:19:14,477 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:19:14,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:19:14,477 INFO L85 PathProgramCache]: Analyzing trace with hash -2104310575, now seen corresponding path program 1 times [2021-11-07 02:19:14,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:19:14,478 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [753709328] [2021-11-07 02:19:14,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:14,479 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:19:14,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:19:14,480 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:19:14,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 02:19:15,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:15,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:19:15,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:15,918 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:15,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:16,218 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:16,218 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:19:16,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [753709328] [2021-11-07 02:19:16,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [753709328] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:19:16,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1489867444] [2021-11-07 02:19:16,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:16,219 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:19:16,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:19:16,223 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:19:16,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 02:19:17,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:17,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:19:17,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:18,030 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:18,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:18,235 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:18,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1489867444] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:19:18,235 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:19:18,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 02:19:18,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760116193] [2021-11-07 02:19:18,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:19:18,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:19:18,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:19:18,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:19:18,237 INFO L87 Difference]: Start difference. First operand 38826 states and 69465 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:21,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:19:21,246 INFO L93 Difference]: Finished difference Result 41204 states and 73269 transitions. [2021-11-07 02:19:21,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:19:21,249 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 02:19:21,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:19:21,320 INFO L225 Difference]: With dead ends: 41204 [2021-11-07 02:19:21,321 INFO L226 Difference]: Without dead ends: 40300 [2021-11-07 02:19:21,329 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:19:21,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40300 states. [2021-11-07 02:19:23,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40300 to 38838. [2021-11-07 02:19:23,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38838 states, 38836 states have (on average 1.7889844474199197) internal successors, (69477), 38837 states have internal predecessors, (69477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:23,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38838 states to 38838 states and 69477 transitions. [2021-11-07 02:19:23,902 INFO L78 Accepts]: Start accepts. Automaton has 38838 states and 69477 transitions. Word has length 86 [2021-11-07 02:19:23,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:19:23,902 INFO L470 AbstractCegarLoop]: Abstraction has 38838 states and 69477 transitions. [2021-11-07 02:19:23,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:23,903 INFO L276 IsEmpty]: Start isEmpty. Operand 38838 states and 69477 transitions. [2021-11-07 02:19:23,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 02:19:23,930 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:19:23,930 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:19:23,941 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-11-07 02:19:24,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 02:19:24,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:19:24,337 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:19:24,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:19:24,337 INFO L85 PathProgramCache]: Analyzing trace with hash 1717515547, now seen corresponding path program 1 times [2021-11-07 02:19:24,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:19:24,338 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1187648031] [2021-11-07 02:19:24,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:24,338 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:19:24,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:19:24,340 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:19:24,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 02:19:25,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:25,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:19:25,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:25,783 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:25,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:26,027 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:26,027 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:19:26,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1187648031] [2021-11-07 02:19:26,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1187648031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:19:26,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1227323055] [2021-11-07 02:19:26,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:26,028 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:19:26,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:19:26,029 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:19:26,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 02:19:27,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:27,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:19:27,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:28,043 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:28,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:28,293 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:28,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1227323055] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:19:28,293 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:19:28,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 02:19:28,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105010100] [2021-11-07 02:19:28,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 02:19:28,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:19:28,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 02:19:28,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:19:28,295 INFO L87 Difference]: Start difference. First operand 38838 states and 69477 transitions. Second operand has 7 states, 7 states have (on average 11.428571428571429) internal successors, (80), 7 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:33,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:19:33,014 INFO L93 Difference]: Finished difference Result 40076 states and 71458 transitions. [2021-11-07 02:19:33,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:19:33,015 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.428571428571429) internal successors, (80), 7 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 02:19:33,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:19:33,075 INFO L225 Difference]: With dead ends: 40076 [2021-11-07 02:19:33,075 INFO L226 Difference]: Without dead ends: 39128 [2021-11-07 02:19:33,083 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-07 02:19:33,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39128 states. [2021-11-07 02:19:35,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39128 to 38814. [2021-11-07 02:19:35,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38814 states, 38812 states have (on average 1.7886736061012058) internal successors, (69422), 38813 states have internal predecessors, (69422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:35,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38814 states to 38814 states and 69422 transitions. [2021-11-07 02:19:35,765 INFO L78 Accepts]: Start accepts. Automaton has 38814 states and 69422 transitions. Word has length 86 [2021-11-07 02:19:35,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:19:35,765 INFO L470 AbstractCegarLoop]: Abstraction has 38814 states and 69422 transitions. [2021-11-07 02:19:35,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.428571428571429) internal successors, (80), 7 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:35,766 INFO L276 IsEmpty]: Start isEmpty. Operand 38814 states and 69422 transitions. [2021-11-07 02:19:35,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 02:19:35,812 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:19:35,812 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:19:35,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 02:19:36,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-11-07 02:19:36,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:19:36,232 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:19:36,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:19:36,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1083538574, now seen corresponding path program 1 times [2021-11-07 02:19:36,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:19:36,233 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [954184959] [2021-11-07 02:19:36,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:36,233 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:19:36,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:19:36,235 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:19:36,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 02:19:37,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:37,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:19:37,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:37,748 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:37,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:37,999 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:37,999 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:19:37,999 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [954184959] [2021-11-07 02:19:37,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [954184959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:19:38,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2120074103] [2021-11-07 02:19:38,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:38,000 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:19:38,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:19:38,001 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:19:38,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 02:19:39,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:39,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 02:19:39,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:39,972 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:39,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:40,159 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:40,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2120074103] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:19:40,160 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:19:40,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 02:19:40,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235494914] [2021-11-07 02:19:40,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:19:40,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:19:40,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:19:40,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 02:19:40,162 INFO L87 Difference]: Start difference. First operand 38814 states and 69422 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:42,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:19:42,858 INFO L93 Difference]: Finished difference Result 40411 states and 72020 transitions. [2021-11-07 02:19:42,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:19:42,858 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 02:19:42,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:19:42,915 INFO L225 Difference]: With dead ends: 40411 [2021-11-07 02:19:42,915 INFO L226 Difference]: Without dead ends: 39467 [2021-11-07 02:19:42,923 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:19:42,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39467 states. [2021-11-07 02:19:45,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39467 to 38747. [2021-11-07 02:19:45,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38747 states, 38745 states have (on average 1.7887985546522132) internal successors, (69307), 38746 states have internal predecessors, (69307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:45,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38747 states to 38747 states and 69307 transitions. [2021-11-07 02:19:45,329 INFO L78 Accepts]: Start accepts. Automaton has 38747 states and 69307 transitions. Word has length 86 [2021-11-07 02:19:45,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:19:45,330 INFO L470 AbstractCegarLoop]: Abstraction has 38747 states and 69307 transitions. [2021-11-07 02:19:45,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:19:45,330 INFO L276 IsEmpty]: Start isEmpty. Operand 38747 states and 69307 transitions. [2021-11-07 02:19:45,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 02:19:45,351 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:19:45,352 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:19:45,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 02:19:45,565 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-07 02:19:45,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:19:45,752 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:19:45,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:19:45,753 INFO L85 PathProgramCache]: Analyzing trace with hash -2129347872, now seen corresponding path program 1 times [2021-11-07 02:19:45,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:19:45,753 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [80833403] [2021-11-07 02:19:45,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:45,754 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:19:45,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:19:45,754 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:19:45,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 02:19:47,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:47,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:19:47,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:47,501 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:47,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:47,758 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:19:47,758 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:19:47,758 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [80833403] [2021-11-07 02:19:47,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [80833403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:19:47,758 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2101208512] [2021-11-07 02:19:47,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:19:47,759 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:19:47,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:19:47,760 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:19:47,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7d39fa51-512b-4efb-8a34-52a0a9fa356a/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 02:19:49,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:19:49,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:19:49,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:19:49,801 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:49,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:19:49,987 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:19:49,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2101208512] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:19:49,987 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:19:49,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 02:19:49,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496236954] [2021-11-07 02:19:49,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:19:49,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:19:49,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:19:49,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:19:49,989 INFO L87 Difference]: Start difference. First operand 38747 states and 69307 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)