./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec1_product16.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_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/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_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec1_product16.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/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_fee1c526-19b9-4c67-b732-2af73a4494ff/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 8953ac6143780bf628ca2bf650b2a5c9b00061ee3dd80e32fadc01758229df18 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:58:34,647 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:58:34,649 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:58:34,685 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:58:34,686 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:58:34,687 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:58:34,689 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:58:34,691 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:58:34,693 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:58:34,694 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:58:34,696 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:58:34,697 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:58:34,697 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:58:34,699 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:58:34,700 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:58:34,702 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:58:34,703 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:58:34,704 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:58:34,706 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:58:34,709 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:58:34,711 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:58:34,712 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:58:34,714 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:58:34,715 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:58:34,718 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:58:34,719 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:58:34,719 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:58:34,721 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:58:34,721 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:58:34,723 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:58:34,723 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:58:34,730 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:58:34,732 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:58:34,733 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:58:34,735 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:58:34,735 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:58:34,736 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:58:34,736 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:58:34,737 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:58:34,738 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:58:34,739 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:58:34,739 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:58:34,789 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:58:34,789 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:58:34,791 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:58:34,791 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:58:34,792 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:58:34,792 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:58:34,792 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:58:34,793 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:58:34,799 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:58:34,799 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:58:34,800 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:58:34,800 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:58:34,801 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:58:34,801 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:58:34,801 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:58:34,802 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:58:34,802 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:58:34,803 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:58:34,803 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:58:34,803 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:58:34,804 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:58:34,804 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:58:34,804 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:58:34,804 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:58:34,805 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:58:34,805 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:58:34,805 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:58:34,805 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:58:34,806 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:58:34,807 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:58:34,808 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:58:34,808 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:58:34,809 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:58:34,809 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:58:34,809 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:58:34,809 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:58:34,810 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:58:34,810 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:58:34,810 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:58:34,811 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_fee1c526-19b9-4c67-b732-2af73a4494ff/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8953ac6143780bf628ca2bf650b2a5c9b00061ee3dd80e32fadc01758229df18 [2021-11-07 00:58:35,081 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:58:35,102 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:58:35,105 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:58:35,106 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:58:35,107 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:58:35,108 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec1_product16.cil.c [2021-11-07 00:58:35,203 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data/9ff204677/55ecc3e386434f3aa03c534bb8dbd4c0/FLAGe2c1e0836 [2021-11-07 00:58:35,924 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:58:35,926 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/sv-benchmarks/c/product-lines/email_spec1_product16.cil.c [2021-11-07 00:58:35,957 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data/9ff204677/55ecc3e386434f3aa03c534bb8dbd4c0/FLAGe2c1e0836 [2021-11-07 00:58:36,093 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data/9ff204677/55ecc3e386434f3aa03c534bb8dbd4c0 [2021-11-07 00:58:36,095 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:58:36,097 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:58:36,099 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:58:36,099 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:58:36,103 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:58:36,104 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:58:36" (1/1) ... [2021-11-07 00:58:36,105 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2eb8be94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:36, skipping insertion in model container [2021-11-07 00:58:36,105 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:58:36" (1/1) ... [2021-11-07 00:58:36,113 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:58:36,184 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:58:36,608 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_fee1c526-19b9-4c67-b732-2af73a4494ff/sv-benchmarks/c/product-lines/email_spec1_product16.cil.c[36116,36129] [2021-11-07 00:58:36,897 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:36,914 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 00:58:36,915 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@659d97c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:36, skipping insertion in model container [2021-11-07 00:58:36,915 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:58:36,915 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 00:58:36,918 INFO L168 Benchmark]: Toolchain (without parser) took 819.75 ms. Allocated memory was 94.4 MB in the beginning and 117.4 MB in the end (delta: 23.1 MB). Free memory was 58.8 MB in the beginning and 79.3 MB in the end (delta: -20.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-07 00:58:36,919 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 94.4 MB. Free memory is still 47.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 00:58:36,921 INFO L168 Benchmark]: CACSL2BoogieTranslator took 816.38 ms. Allocated memory was 94.4 MB in the beginning and 117.4 MB in the end (delta: 23.1 MB). Free memory was 58.6 MB in the beginning and 79.3 MB in the end (delta: -20.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 00:58:36,923 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 94.4 MB. Free memory is still 47.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 816.38 ms. Allocated memory was 94.4 MB in the beginning and 117.4 MB in the end (delta: 23.1 MB). Free memory was 58.6 MB in the beginning and 79.3 MB in the end (delta: -20.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 1645]: 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_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/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_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec1_product16.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/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_fee1c526-19b9-4c67-b732-2af73a4494ff/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 8953ac6143780bf628ca2bf650b2a5c9b00061ee3dd80e32fadc01758229df18 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:58:39,177 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:58:39,180 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:58:39,239 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:58:39,240 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:58:39,246 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:58:39,248 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:58:39,253 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:58:39,256 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:58:39,266 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:58:39,268 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:58:39,271 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:58:39,271 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:58:39,274 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:58:39,277 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:58:39,283 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:58:39,285 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:58:39,286 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:58:39,289 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:58:39,301 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:58:39,303 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:58:39,304 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:58:39,307 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:58:39,309 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:58:39,318 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:58:39,319 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:58:39,319 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:58:39,321 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:58:39,321 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:58:39,323 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:58:39,323 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:58:39,324 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:58:39,326 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:58:39,327 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:58:39,328 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:58:39,328 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:58:39,329 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:58:39,329 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:58:39,330 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:58:39,331 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:58:39,332 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:58:39,337 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 00:58:39,379 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:58:39,380 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:58:39,381 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:58:39,381 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:58:39,381 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:58:39,382 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:58:39,382 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:58:39,382 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:58:39,382 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:58:39,384 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:58:39,388 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:58:39,388 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:58:39,389 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:58:39,389 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:58:39,389 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:58:39,389 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:58:39,389 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:58:39,389 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 00:58:39,390 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 00:58:39,390 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:58:39,390 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:58:39,390 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:58:39,390 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:58:39,391 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:58:39,391 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 00:58:39,391 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:58:39,391 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:58:39,392 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:58:39,392 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:58:39,392 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:58:39,392 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 00:58:39,392 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:39,393 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:58:39,393 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:58:39,393 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:58:39,393 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_fee1c526-19b9-4c67-b732-2af73a4494ff/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8953ac6143780bf628ca2bf650b2a5c9b00061ee3dd80e32fadc01758229df18 [2021-11-07 00:58:39,762 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:58:39,786 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:58:39,790 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:58:39,792 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:58:39,793 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:58:39,795 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec1_product16.cil.c [2021-11-07 00:58:39,876 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data/68ffc88b8/41d8b2eb08b14b489a2353d194c9d008/FLAGd8615e11b [2021-11-07 00:58:40,667 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:58:40,668 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/sv-benchmarks/c/product-lines/email_spec1_product16.cil.c [2021-11-07 00:58:40,697 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data/68ffc88b8/41d8b2eb08b14b489a2353d194c9d008/FLAGd8615e11b [2021-11-07 00:58:40,767 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/data/68ffc88b8/41d8b2eb08b14b489a2353d194c9d008 [2021-11-07 00:58:40,776 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:58:40,778 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:58:40,782 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:58:40,782 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:58:40,787 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:58:40,788 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:58:40" (1/1) ... [2021-11-07 00:58:40,790 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21299e60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:40, skipping insertion in model container [2021-11-07 00:58:40,790 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:58:40" (1/1) ... [2021-11-07 00:58:40,799 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:58:40,879 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:58:41,455 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_fee1c526-19b9-4c67-b732-2af73a4494ff/sv-benchmarks/c/product-lines/email_spec1_product16.cil.c[36116,36129] [2021-11-07 00:58:41,616 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:41,639 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 00:58:41,668 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:58:41,741 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_fee1c526-19b9-4c67-b732-2af73a4494ff/sv-benchmarks/c/product-lines/email_spec1_product16.cil.c[36116,36129] [2021-11-07 00:58:41,788 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:41,796 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:58:41,884 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_fee1c526-19b9-4c67-b732-2af73a4494ff/sv-benchmarks/c/product-lines/email_spec1_product16.cil.c[36116,36129] [2021-11-07 00:58:41,945 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:58:42,007 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:58:42,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42 WrapperNode [2021-11-07 00:58:42,008 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:58:42,009 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:58:42,009 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:58:42,010 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:58:42,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,090 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,224 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:58:42,225 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:58:42,225 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:58:42,226 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:58:42,236 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,236 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,257 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,257 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,330 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,365 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,372 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,385 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:58:42,386 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:58:42,387 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:58:42,387 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:58:42,388 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (1/1) ... [2021-11-07 00:58:42,395 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:58:42,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:58:42,424 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:58:42,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:58:42,472 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 00:58:42,472 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:58:42,472 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 00:58:42,473 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:58:42,473 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:58:47,334 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:58:47,335 INFO L299 CfgBuilder]: Removed 291 assume(true) statements. [2021-11-07 00:58:47,338 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:58:47 BoogieIcfgContainer [2021-11-07 00:58:47,339 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:58:47,341 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:58:47,341 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:58:47,344 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:58:47,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:58:40" (1/3) ... [2021-11-07 00:58:47,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71ba50ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:58:47, skipping insertion in model container [2021-11-07 00:58:47,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:58:42" (2/3) ... [2021-11-07 00:58:47,346 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71ba50ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:58:47, skipping insertion in model container [2021-11-07 00:58:47,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:58:47" (3/3) ... [2021-11-07 00:58:47,348 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec1_product16.cil.c [2021-11-07 00:58:47,353 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:58:47,354 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 00:58:47,411 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:58:47,418 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 00:58:47,418 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 00:58:47,446 INFO L276 IsEmpty]: Start isEmpty. Operand has 449 states, 446 states have (on average 1.748878923766816) internal successors, (780), 448 states have internal predecessors, (780), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:47,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-07 00:58:47,460 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:47,460 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] [2021-11-07 00:58:47,461 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:47,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:47,467 INFO L85 PathProgramCache]: Analyzing trace with hash 840373952, now seen corresponding path program 1 times [2021-11-07 00:58:47,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:47,483 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1117021934] [2021-11-07 00:58:47,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:47,484 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:47,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:47,487 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:47,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 00:58:47,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:47,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 00:58:47,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:48,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:48,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:48,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:48,219 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:48,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1117021934] [2021-11-07 00:58:48,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1117021934] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:48,220 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:48,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 00:58:48,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552866752] [2021-11-07 00:58:48,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 00:58:48,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:48,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 00:58:48,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:58:48,251 INFO L87 Difference]: Start difference. First operand has 449 states, 446 states have (on average 1.748878923766816) internal successors, (780), 448 states have internal predecessors, (780), 0 states have call successors, (0), 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 20.5) internal successors, (41), 2 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:48,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:48,309 INFO L93 Difference]: Finished difference Result 656 states and 1119 transitions. [2021-11-07 00:58:48,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 00:58:48,311 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 20.5) internal successors, (41), 2 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-07 00:58:48,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:48,327 INFO L225 Difference]: With dead ends: 656 [2021-11-07 00:58:48,328 INFO L226 Difference]: Without dead ends: 384 [2021-11-07 00:58:48,333 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:58:48,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2021-11-07 00:58:48,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 384. [2021-11-07 00:58:48,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 384 states, 382 states have (on average 1.7513089005235603) internal successors, (669), 383 states have internal predecessors, (669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:48,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 669 transitions. [2021-11-07 00:58:48,441 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 669 transitions. Word has length 41 [2021-11-07 00:58:48,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:48,442 INFO L470 AbstractCegarLoop]: Abstraction has 384 states and 669 transitions. [2021-11-07 00:58:48,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 20.5) internal successors, (41), 2 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:48,442 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 669 transitions. [2021-11-07 00:58:48,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-07 00:58:48,447 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:48,448 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] [2021-11-07 00:58:48,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:48,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:48,649 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:48,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:48,651 INFO L85 PathProgramCache]: Analyzing trace with hash 948761907, now seen corresponding path program 1 times [2021-11-07 00:58:48,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:48,653 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2003677309] [2021-11-07 00:58:48,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:48,653 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:48,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:48,655 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:48,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 00:58:49,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:49,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:58:49,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:49,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:49,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:49,451 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:49,451 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:49,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2003677309] [2021-11-07 00:58:49,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2003677309] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:49,452 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:49,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:58:49,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670026867] [2021-11-07 00:58:49,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:49,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:49,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:49,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:49,456 INFO L87 Difference]: Start difference. First operand 384 states and 669 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:49,736 INFO L93 Difference]: Finished difference Result 1122 states and 1959 transitions. [2021-11-07 00:58:49,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:49,737 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-07 00:58:49,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:49,744 INFO L225 Difference]: With dead ends: 1122 [2021-11-07 00:58:49,744 INFO L226 Difference]: Without dead ends: 753 [2021-11-07 00:58:49,748 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:49,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 753 states. [2021-11-07 00:58:49,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 753 to 383. [2021-11-07 00:58:49,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 383 states, 381 states have (on average 1.7427821522309712) internal successors, (664), 382 states have internal predecessors, (664), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 664 transitions. [2021-11-07 00:58:49,793 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 664 transitions. Word has length 42 [2021-11-07 00:58:49,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:49,794 INFO L470 AbstractCegarLoop]: Abstraction has 383 states and 664 transitions. [2021-11-07 00:58:49,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:49,794 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 664 transitions. [2021-11-07 00:58:49,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-07 00:58:49,798 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:49,798 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] [2021-11-07 00:58:49,815 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-07 00:58:50,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:50,016 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:50,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:50,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1153087629, now seen corresponding path program 1 times [2021-11-07 00:58:50,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:50,018 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1181767145] [2021-11-07 00:58:50,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:50,018 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:50,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:50,023 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:50,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 00:58:50,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:50,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:58:50,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:50,593 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:50,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:50,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:50,765 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:50,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1181767145] [2021-11-07 00:58:50,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1181767145] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:50,765 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:50,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:58:50,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225604299] [2021-11-07 00:58:50,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:58:50,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:50,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:58:50,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:58:50,770 INFO L87 Difference]: Start difference. First operand 383 states and 664 transitions. Second operand has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:51,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:51,051 INFO L93 Difference]: Finished difference Result 1449 states and 2518 transitions. [2021-11-07 00:58:51,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:58:51,052 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 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 44 [2021-11-07 00:58:51,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:51,076 INFO L225 Difference]: With dead ends: 1449 [2021-11-07 00:58:51,076 INFO L226 Difference]: Without dead ends: 1084 [2021-11-07 00:58:51,077 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:58:51,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1084 states. [2021-11-07 00:58:51,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1084 to 382. [2021-11-07 00:58:51,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 380 states have (on average 1.736842105263158) internal successors, (660), 381 states have internal predecessors, (660), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:51,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 660 transitions. [2021-11-07 00:58:51,143 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 660 transitions. Word has length 44 [2021-11-07 00:58:51,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:51,144 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 660 transitions. [2021-11-07 00:58:51,146 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.166666666666666) internal successors, (49), 6 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:51,146 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 660 transitions. [2021-11-07 00:58:51,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 00:58:51,157 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:51,158 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:51,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:51,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:51,375 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:51,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:51,376 INFO L85 PathProgramCache]: Analyzing trace with hash 2047054938, now seen corresponding path program 1 times [2021-11-07 00:58:51,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:51,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1237427255] [2021-11-07 00:58:51,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:51,378 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:51,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:51,381 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:51,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 00:58:51,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:51,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:58:51,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:51,998 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:51,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:52,123 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:52,124 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:52,125 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1237427255] [2021-11-07 00:58:52,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1237427255] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:52,125 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:52,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:58:52,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387619639] [2021-11-07 00:58:52,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:52,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:52,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:52,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:52,129 INFO L87 Difference]: Start difference. First operand 382 states and 660 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:52,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:52,206 INFO L93 Difference]: Finished difference Result 761 states and 1317 transitions. [2021-11-07 00:58:52,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:52,206 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 00:58:52,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:52,210 INFO L225 Difference]: With dead ends: 761 [2021-11-07 00:58:52,210 INFO L226 Difference]: Without dead ends: 387 [2021-11-07 00:58:52,211 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:52,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-07 00:58:52,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 382. [2021-11-07 00:58:52,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 380 states have (on average 1.7289473684210526) internal successors, (657), 381 states have internal predecessors, (657), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:52,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 657 transitions. [2021-11-07 00:58:52,242 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 657 transitions. Word has length 45 [2021-11-07 00:58:52,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:52,243 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 657 transitions. [2021-11-07 00:58:52,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:52,243 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 657 transitions. [2021-11-07 00:58:52,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 00:58:52,245 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:52,245 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:52,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:52,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:52,459 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:52,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:52,461 INFO L85 PathProgramCache]: Analyzing trace with hash 112472741, now seen corresponding path program 1 times [2021-11-07 00:58:52,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:52,463 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [192193025] [2021-11-07 00:58:52,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:52,463 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:52,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:52,464 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:52,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 00:58:52,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:52,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:58:52,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:53,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:53,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:53,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:53,258 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:53,258 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [192193025] [2021-11-07 00:58:53,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [192193025] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:53,259 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:53,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:58:53,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197688033] [2021-11-07 00:58:53,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:58:53,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:53,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:58:53,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:58:53,261 INFO L87 Difference]: Start difference. First operand 382 states and 657 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:53,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:53,496 INFO L93 Difference]: Finished difference Result 1436 states and 2494 transitions. [2021-11-07 00:58:53,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:58:53,497 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 00:58:53,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:53,505 INFO L225 Difference]: With dead ends: 1436 [2021-11-07 00:58:53,505 INFO L226 Difference]: Without dead ends: 1080 [2021-11-07 00:58:53,507 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:58:53,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1080 states. [2021-11-07 00:58:53,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1080 to 382. [2021-11-07 00:58:53,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 380 states have (on average 1.7210526315789474) internal successors, (654), 381 states have internal predecessors, (654), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:53,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 654 transitions. [2021-11-07 00:58:53,547 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 654 transitions. Word has length 46 [2021-11-07 00:58:53,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:53,548 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 654 transitions. [2021-11-07 00:58:53,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:53,548 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 654 transitions. [2021-11-07 00:58:53,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 00:58:53,549 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:53,549 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:53,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:53,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:53,764 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:53,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:53,765 INFO L85 PathProgramCache]: Analyzing trace with hash 2008970762, now seen corresponding path program 1 times [2021-11-07 00:58:53,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:53,766 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [287065796] [2021-11-07 00:58:53,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:53,767 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:53,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:53,768 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:53,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 00:58:54,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:54,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:54,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:54,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:54,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:54,548 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:54,548 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:54,549 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [287065796] [2021-11-07 00:58:54,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [287065796] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:54,549 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:54,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:58:54,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455620764] [2021-11-07 00:58:54,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:54,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:54,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:54,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:54,551 INFO L87 Difference]: Start difference. First operand 382 states and 654 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:54,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:54,633 INFO L93 Difference]: Finished difference Result 880 states and 1509 transitions. [2021-11-07 00:58:54,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:54,633 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 00:58:54,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:54,640 INFO L225 Difference]: With dead ends: 880 [2021-11-07 00:58:54,640 INFO L226 Difference]: Without dead ends: 738 [2021-11-07 00:58:54,641 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:54,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 738 states. [2021-11-07 00:58:54,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 738 to 596. [2021-11-07 00:58:54,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 596 states, 594 states have (on average 1.7592592592592593) internal successors, (1045), 595 states have internal predecessors, (1045), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:54,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 596 states to 596 states and 1045 transitions. [2021-11-07 00:58:54,696 INFO L78 Accepts]: Start accepts. Automaton has 596 states and 1045 transitions. Word has length 48 [2021-11-07 00:58:54,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:54,697 INFO L470 AbstractCegarLoop]: Abstraction has 596 states and 1045 transitions. [2021-11-07 00:58:54,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:54,697 INFO L276 IsEmpty]: Start isEmpty. Operand 596 states and 1045 transitions. [2021-11-07 00:58:54,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-07 00:58:54,699 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:54,699 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] [2021-11-07 00:58:54,716 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-07 00:58:54,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:54,913 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:54,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:54,913 INFO L85 PathProgramCache]: Analyzing trace with hash 789764825, now seen corresponding path program 1 times [2021-11-07 00:58:54,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:54,914 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [335759401] [2021-11-07 00:58:54,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:54,914 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:54,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:54,915 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:54,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 00:58:55,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:55,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:55,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:55,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:55,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:55,751 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:55,751 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:55,751 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [335759401] [2021-11-07 00:58:55,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [335759401] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:55,751 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:55,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:58:55,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621549390] [2021-11-07 00:58:55,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:55,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:55,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:55,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:55,753 INFO L87 Difference]: Start difference. First operand 596 states and 1045 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:55,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:55,835 INFO L93 Difference]: Finished difference Result 1412 states and 2483 transitions. [2021-11-07 00:58:55,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:55,836 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 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 60 [2021-11-07 00:58:55,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:55,842 INFO L225 Difference]: With dead ends: 1412 [2021-11-07 00:58:55,843 INFO L226 Difference]: Without dead ends: 900 [2021-11-07 00:58:55,844 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:55,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2021-11-07 00:58:55,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 758. [2021-11-07 00:58:55,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 758 states, 756 states have (on average 1.7711640211640212) internal successors, (1339), 757 states have internal predecessors, (1339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:55,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 758 states to 758 states and 1339 transitions. [2021-11-07 00:58:55,911 INFO L78 Accepts]: Start accepts. Automaton has 758 states and 1339 transitions. Word has length 60 [2021-11-07 00:58:55,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:55,911 INFO L470 AbstractCegarLoop]: Abstraction has 758 states and 1339 transitions. [2021-11-07 00:58:55,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:55,911 INFO L276 IsEmpty]: Start isEmpty. Operand 758 states and 1339 transitions. [2021-11-07 00:58:55,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-07 00:58:55,913 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:55,913 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 00:58:55,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:56,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:56,129 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:56,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:56,129 INFO L85 PathProgramCache]: Analyzing trace with hash 1610376026, now seen corresponding path program 1 times [2021-11-07 00:58:56,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:56,130 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [612660573] [2021-11-07 00:58:56,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:56,130 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:56,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:56,131 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:56,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 00:58:56,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:56,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:56,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:56,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:56,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:57,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:57,082 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:57,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [612660573] [2021-11-07 00:58:57,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [612660573] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:57,082 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:57,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:58:57,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416306147] [2021-11-07 00:58:57,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:58:57,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:57,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:58:57,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:57,085 INFO L87 Difference]: Start difference. First operand 758 states and 1339 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 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 00:58:57,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:57,209 INFO L93 Difference]: Finished difference Result 1942 states and 3451 transitions. [2021-11-07 00:58:57,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:57,210 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 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 61 [2021-11-07 00:58:57,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:57,221 INFO L225 Difference]: With dead ends: 1942 [2021-11-07 00:58:57,222 INFO L226 Difference]: Without dead ends: 1272 [2021-11-07 00:58:57,224 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:58:57,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-07 00:58:57,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1130. [2021-11-07 00:58:57,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1130 states, 1128 states have (on average 1.7881205673758864) internal successors, (2017), 1129 states have internal predecessors, (2017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:57,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1130 states to 1130 states and 2017 transitions. [2021-11-07 00:58:57,346 INFO L78 Accepts]: Start accepts. Automaton has 1130 states and 2017 transitions. Word has length 61 [2021-11-07 00:58:57,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:57,347 INFO L470 AbstractCegarLoop]: Abstraction has 1130 states and 2017 transitions. [2021-11-07 00:58:57,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 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 00:58:57,348 INFO L276 IsEmpty]: Start isEmpty. Operand 1130 states and 2017 transitions. [2021-11-07 00:58:57,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-07 00:58:57,350 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:57,351 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] [2021-11-07 00:58:57,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:57,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:57,569 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:57,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:57,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1556317014, now seen corresponding path program 1 times [2021-11-07 00:58:57,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:57,570 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [116006888] [2021-11-07 00:58:57,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:57,570 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:57,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:57,571 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:57,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 00:58:58,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:58,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:58,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:58,355 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:58,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:58,539 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:58,540 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:58,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [116006888] [2021-11-07 00:58:58,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [116006888] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:58,543 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:58:58,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:58:58,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244693751] [2021-11-07 00:58:58,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:58,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:58,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:58,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:58,546 INFO L87 Difference]: Start difference. First operand 1130 states and 2017 transitions. Second operand has 4 states, 4 states have (on average 17.25) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:58,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:58,689 INFO L93 Difference]: Finished difference Result 2156 states and 3839 transitions. [2021-11-07 00:58:58,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:58:58,690 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.25) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-07 00:58:58,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:58,701 INFO L225 Difference]: With dead ends: 2156 [2021-11-07 00:58:58,701 INFO L226 Difference]: Without dead ends: 1272 [2021-11-07 00:58:58,703 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:58:58,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-07 00:58:58,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1130. [2021-11-07 00:58:58,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1130 states, 1128 states have (on average 1.7863475177304964) internal successors, (2015), 1129 states have internal predecessors, (2015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:58,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1130 states to 1130 states and 2015 transitions. [2021-11-07 00:58:58,852 INFO L78 Accepts]: Start accepts. Automaton has 1130 states and 2015 transitions. Word has length 62 [2021-11-07 00:58:58,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:58,852 INFO L470 AbstractCegarLoop]: Abstraction has 1130 states and 2015 transitions. [2021-11-07 00:58:58,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.25) internal successors, (69), 4 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:58,853 INFO L276 IsEmpty]: Start isEmpty. Operand 1130 states and 2015 transitions. [2021-11-07 00:58:58,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-07 00:58:58,856 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:58,856 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:58,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:59,071 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:59,072 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:59,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:59,072 INFO L85 PathProgramCache]: Analyzing trace with hash 1532972395, now seen corresponding path program 1 times [2021-11-07 00:58:59,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:59,073 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [6837570] [2021-11-07 00:58:59,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:59,074 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:59,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:59,075 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:59,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 00:58:59,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:59,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:58:59,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:59,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:59,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:00,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:00,019 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:00,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [6837570] [2021-11-07 00:59:00,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [6837570] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:00,019 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:00,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:59:00,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859069661] [2021-11-07 00:59:00,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:59:00,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:00,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:59:00,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:00,021 INFO L87 Difference]: Start difference. First operand 1130 states and 2015 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 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 00:59:00,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:00,196 INFO L93 Difference]: Finished difference Result 3030 states and 5434 transitions. [2021-11-07 00:59:00,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:59:00,197 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-07 00:59:00,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:00,214 INFO L225 Difference]: With dead ends: 3030 [2021-11-07 00:59:00,215 INFO L226 Difference]: Without dead ends: 1996 [2021-11-07 00:59:00,218 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:00,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1996 states. [2021-11-07 00:59:00,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1996 to 1854. [2021-11-07 00:59:00,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1854 states, 1852 states have (on average 1.8002159827213824) internal successors, (3334), 1853 states have internal predecessors, (3334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:00,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1854 states to 1854 states and 3334 transitions. [2021-11-07 00:59:00,411 INFO L78 Accepts]: Start accepts. Automaton has 1854 states and 3334 transitions. Word has length 62 [2021-11-07 00:59:00,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:00,412 INFO L470 AbstractCegarLoop]: Abstraction has 1854 states and 3334 transitions. [2021-11-07 00:59:00,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 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 00:59:00,412 INFO L276 IsEmpty]: Start isEmpty. Operand 1854 states and 3334 transitions. [2021-11-07 00:59:00,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-07 00:59:00,416 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:00,417 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:00,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:00,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:00,635 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:00,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:00,635 INFO L85 PathProgramCache]: Analyzing trace with hash 900656088, now seen corresponding path program 1 times [2021-11-07 00:59:00,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:00,636 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [826393487] [2021-11-07 00:59:00,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:00,636 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:00,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:00,637 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:00,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 00:59:01,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:01,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:59:01,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:01,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:01,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:01,574 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:01,574 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:01,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [826393487] [2021-11-07 00:59:01,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [826393487] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:01,574 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:01,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:59:01,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920967603] [2021-11-07 00:59:01,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:59:01,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:01,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:59:01,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:01,576 INFO L87 Difference]: Start difference. First operand 1854 states and 3334 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:01,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:01,789 INFO L93 Difference]: Finished difference Result 4938 states and 8910 transitions. [2021-11-07 00:59:01,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:59:01,790 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-07 00:59:01,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:01,812 INFO L225 Difference]: With dead ends: 4938 [2021-11-07 00:59:01,812 INFO L226 Difference]: Without dead ends: 3214 [2021-11-07 00:59:01,815 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:01,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3214 states. [2021-11-07 00:59:02,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3214 to 3072. [2021-11-07 00:59:02,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3072 states, 3070 states have (on average 1.8068403908794788) internal successors, (5547), 3071 states have internal predecessors, (5547), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:02,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3072 states to 3072 states and 5547 transitions. [2021-11-07 00:59:02,068 INFO L78 Accepts]: Start accepts. Automaton has 3072 states and 5547 transitions. Word has length 63 [2021-11-07 00:59:02,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:02,069 INFO L470 AbstractCegarLoop]: Abstraction has 3072 states and 5547 transitions. [2021-11-07 00:59:02,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:02,070 INFO L276 IsEmpty]: Start isEmpty. Operand 3072 states and 5547 transitions. [2021-11-07 00:59:02,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 00:59:02,079 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:02,079 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:02,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:02,294 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:02,294 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:02,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:02,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1832825222, now seen corresponding path program 1 times [2021-11-07 00:59:02,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:02,295 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1052943832] [2021-11-07 00:59:02,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:02,296 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:02,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:02,297 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:02,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 00:59:02,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:02,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:59:02,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:03,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:03,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:03,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:03,232 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:03,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1052943832] [2021-11-07 00:59:03,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1052943832] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:03,232 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:03,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:59:03,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069860761] [2021-11-07 00:59:03,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:59:03,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:03,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:59:03,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:03,234 INFO L87 Difference]: Start difference. First operand 3072 states and 5547 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:03,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:03,606 INFO L93 Difference]: Finished difference Result 8308 states and 15032 transitions. [2021-11-07 00:59:03,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:59:03,606 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 00:59:03,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:03,643 INFO L225 Difference]: With dead ends: 8308 [2021-11-07 00:59:03,643 INFO L226 Difference]: Without dead ends: 5400 [2021-11-07 00:59:03,647 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:03,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5400 states. [2021-11-07 00:59:04,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5400 to 5258. [2021-11-07 00:59:04,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5258 states, 5256 states have (on average 1.808980213089802) internal successors, (9508), 5257 states have internal predecessors, (9508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:04,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5258 states to 5258 states and 9508 transitions. [2021-11-07 00:59:04,060 INFO L78 Accepts]: Start accepts. Automaton has 5258 states and 9508 transitions. Word has length 64 [2021-11-07 00:59:04,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:04,060 INFO L470 AbstractCegarLoop]: Abstraction has 5258 states and 9508 transitions. [2021-11-07 00:59:04,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:04,061 INFO L276 IsEmpty]: Start isEmpty. Operand 5258 states and 9508 transitions. [2021-11-07 00:59:04,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 00:59:04,065 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:04,065 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] [2021-11-07 00:59:04,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:04,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:04,280 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:04,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:04,281 INFO L85 PathProgramCache]: Analyzing trace with hash -2089386026, now seen corresponding path program 1 times [2021-11-07 00:59:04,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:04,282 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1349835899] [2021-11-07 00:59:04,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:04,283 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:04,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:04,285 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:04,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 00:59:04,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:04,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:04,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:05,144 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:59:05,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:05,402 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:59:05,403 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:05,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1349835899] [2021-11-07 00:59:05,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1349835899] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:05,403 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:05,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:59:05,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634021713] [2021-11-07 00:59:05,404 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:59:05,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:05,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:59:05,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:59:05,406 INFO L87 Difference]: Start difference. First operand 5258 states and 9508 transitions. Second operand has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:08,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:08,762 INFO L93 Difference]: Finished difference Result 19672 states and 35613 transitions. [2021-11-07 00:59:08,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 00:59:08,763 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-07 00:59:08,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:08,838 INFO L225 Difference]: With dead ends: 19672 [2021-11-07 00:59:08,838 INFO L226 Difference]: Without dead ends: 14658 [2021-11-07 00:59:08,850 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:59:08,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14658 states. [2021-11-07 00:59:09,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14658 to 5208. [2021-11-07 00:59:09,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5208 states, 5206 states have (on average 1.7879369957741067) internal successors, (9308), 5207 states have internal predecessors, (9308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:09,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5208 states to 5208 states and 9308 transitions. [2021-11-07 00:59:09,553 INFO L78 Accepts]: Start accepts. Automaton has 5208 states and 9308 transitions. Word has length 65 [2021-11-07 00:59:09,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:09,553 INFO L470 AbstractCegarLoop]: Abstraction has 5208 states and 9308 transitions. [2021-11-07 00:59:09,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:09,554 INFO L276 IsEmpty]: Start isEmpty. Operand 5208 states and 9308 transitions. [2021-11-07 00:59:09,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 00:59:09,562 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:09,562 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:09,586 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:09,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:09,777 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:09,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:09,777 INFO L85 PathProgramCache]: Analyzing trace with hash -538709305, now seen corresponding path program 1 times [2021-11-07 00:59:09,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:09,778 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [410775312] [2021-11-07 00:59:09,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:09,778 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:09,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:09,780 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:09,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 00:59:10,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:10,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:59:10,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:10,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:10,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:10,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:10,909 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:10,909 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [410775312] [2021-11-07 00:59:10,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [410775312] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:10,909 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:10,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:59:10,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205330249] [2021-11-07 00:59:10,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:59:10,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:10,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:59:10,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:10,912 INFO L87 Difference]: Start difference. First operand 5208 states and 9308 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:11,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:11,738 INFO L93 Difference]: Finished difference Result 15045 states and 26938 transitions. [2021-11-07 00:59:11,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:59:11,738 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-07 00:59:11,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:11,768 INFO L225 Difference]: With dead ends: 15045 [2021-11-07 00:59:11,768 INFO L226 Difference]: Without dead ends: 10008 [2021-11-07 00:59:11,777 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:59:11,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10008 states. [2021-11-07 00:59:12,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10008 to 9866. [2021-11-07 00:59:12,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9866 states, 9864 states have (on average 1.7888280616382806) internal successors, (17645), 9865 states have internal predecessors, (17645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:12,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9866 states to 9866 states and 17645 transitions. [2021-11-07 00:59:12,459 INFO L78 Accepts]: Start accepts. Automaton has 9866 states and 17645 transitions. Word has length 65 [2021-11-07 00:59:12,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:12,460 INFO L470 AbstractCegarLoop]: Abstraction has 9866 states and 17645 transitions. [2021-11-07 00:59:12,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:12,460 INFO L276 IsEmpty]: Start isEmpty. Operand 9866 states and 17645 transitions. [2021-11-07 00:59:12,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:59:12,467 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:12,467 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] [2021-11-07 00:59:12,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:12,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:12,686 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:12,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:12,686 INFO L85 PathProgramCache]: Analyzing trace with hash -312271557, now seen corresponding path program 1 times [2021-11-07 00:59:12,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:12,687 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [645842611] [2021-11-07 00:59:12,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:12,688 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:12,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:12,689 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:12,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 00:59:13,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:13,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:13,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:13,739 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:13,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:13,976 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:13,977 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:13,977 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [645842611] [2021-11-07 00:59:13,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [645842611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:13,977 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1296154156] [2021-11-07 00:59:13,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:13,978 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:13,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:13,979 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:13,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 00:59:14,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:14,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:59:14,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:15,175 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:15,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:15,450 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:15,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1296154156] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:15,451 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:15,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 00:59:15,451 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022821935] [2021-11-07 00:59:15,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:59:15,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:15,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:59:15,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:59:15,453 INFO L87 Difference]: Start difference. First operand 9866 states and 17645 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:16,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:16,341 INFO L93 Difference]: Finished difference Result 9963 states and 17801 transitions. [2021-11-07 00:59:16,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:59:16,342 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:59:16,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:16,379 INFO L225 Difference]: With dead ends: 9963 [2021-11-07 00:59:16,379 INFO L226 Difference]: Without dead ends: 9860 [2021-11-07 00:59:16,385 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:59:16,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9860 states. [2021-11-07 00:59:17,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9860 to 9860. [2021-11-07 00:59:17,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9860 states, 9859 states have (on average 1.7888223957805052) internal successors, (17636), 9859 states have internal predecessors, (17636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:17,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9860 states to 9860 states and 17636 transitions. [2021-11-07 00:59:17,220 INFO L78 Accepts]: Start accepts. Automaton has 9860 states and 17636 transitions. Word has length 66 [2021-11-07 00:59:17,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:17,220 INFO L470 AbstractCegarLoop]: Abstraction has 9860 states and 17636 transitions. [2021-11-07 00:59:17,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:17,221 INFO L276 IsEmpty]: Start isEmpty. Operand 9860 states and 17636 transitions. [2021-11-07 00:59:17,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-07 00:59:17,242 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:17,242 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:17,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:17,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-11-07 00:59:17,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:17,648 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:17,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:17,648 INFO L85 PathProgramCache]: Analyzing trace with hash -1067790837, now seen corresponding path program 1 times [2021-11-07 00:59:17,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:17,649 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2002188544] [2021-11-07 00:59:17,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:17,649 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:17,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:17,650 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:17,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 00:59:18,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:18,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:18,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:18,683 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:18,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:19,023 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:19,024 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:19,024 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2002188544] [2021-11-07 00:59:19,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2002188544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:19,024 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1298194764] [2021-11-07 00:59:19,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:19,024 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:19,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:19,037 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:19,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 00:59:20,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:20,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:59:20,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:20,816 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:20,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:21,303 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:21,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1298194764] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:21,303 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:21,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:59:21,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007884833] [2021-11-07 00:59:21,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:59:21,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:21,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:59:21,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:59:21,306 INFO L87 Difference]: Start difference. First operand 9860 states and 17636 transitions. Second operand has 16 states, 16 states have (on average 8.625) internal successors, (138), 15 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:36,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:36,150 INFO L93 Difference]: Finished difference Result 20881 states and 37065 transitions. [2021-11-07 00:59:36,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 00:59:36,151 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.625) internal successors, (138), 15 states have internal predecessors, (138), 0 states have call successors, (0), 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 96 [2021-11-07 00:59:36,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:36,218 INFO L225 Difference]: With dead ends: 20881 [2021-11-07 00:59:36,218 INFO L226 Difference]: Without dead ends: 20765 [2021-11-07 00:59:36,226 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 360 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 00:59:36,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20765 states. [2021-11-07 00:59:37,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20765 to 19591. [2021-11-07 00:59:37,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19591 states, 19590 states have (on average 1.7898417559979583) internal successors, (35063), 19590 states have internal predecessors, (35063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:37,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19591 states to 19591 states and 35063 transitions. [2021-11-07 00:59:37,525 INFO L78 Accepts]: Start accepts. Automaton has 19591 states and 35063 transitions. Word has length 96 [2021-11-07 00:59:37,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:37,526 INFO L470 AbstractCegarLoop]: Abstraction has 19591 states and 35063 transitions. [2021-11-07 00:59:37,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.625) internal successors, (138), 15 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:37,526 INFO L276 IsEmpty]: Start isEmpty. Operand 19591 states and 35063 transitions. [2021-11-07 00:59:37,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-07 00:59:37,572 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:37,573 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:37,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:37,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:37,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:37,986 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:37,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:37,987 INFO L85 PathProgramCache]: Analyzing trace with hash 1118966847, now seen corresponding path program 1 times [2021-11-07 00:59:37,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:37,987 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2092263970] [2021-11-07 00:59:37,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:37,988 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:37,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:37,989 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:37,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 00:59:38,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:38,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:38,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:39,146 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:39,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:39,475 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:39,475 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:39,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2092263970] [2021-11-07 00:59:39,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2092263970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:39,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [169733061] [2021-11-07 00:59:39,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:39,475 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:39,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:39,476 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:39,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-07 00:59:40,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:40,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:40,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:40,895 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:40,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:41,110 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:41,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [169733061] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:41,110 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:41,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 00:59:41,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181902014] [2021-11-07 00:59:41,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:59:41,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:41,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:59:41,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:59:41,113 INFO L87 Difference]: Start difference. First operand 19591 states and 35063 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:41,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:41,935 INFO L93 Difference]: Finished difference Result 19850 states and 35469 transitions. [2021-11-07 00:59:41,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:59:41,936 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-11-07 00:59:41,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:41,981 INFO L225 Difference]: With dead ends: 19850 [2021-11-07 00:59:41,981 INFO L226 Difference]: Without dead ends: 19619 [2021-11-07 00:59:41,988 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:59:42,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19619 states. [2021-11-07 00:59:43,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19619 to 19523. [2021-11-07 00:59:43,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19523 states, 19522 states have (on average 1.790031759041082) internal successors, (34945), 19522 states have internal predecessors, (34945), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:43,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19523 states to 19523 states and 34945 transitions. [2021-11-07 00:59:43,428 INFO L78 Accepts]: Start accepts. Automaton has 19523 states and 34945 transitions. Word has length 97 [2021-11-07 00:59:43,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:43,428 INFO L470 AbstractCegarLoop]: Abstraction has 19523 states and 34945 transitions. [2021-11-07 00:59:43,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:43,428 INFO L276 IsEmpty]: Start isEmpty. Operand 19523 states and 34945 transitions. [2021-11-07 00:59:43,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-07 00:59:43,463 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:43,463 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:43,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:43,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:43,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:43,881 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:43,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:43,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1388534718, now seen corresponding path program 1 times [2021-11-07 00:59:43,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:43,882 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [277151925] [2021-11-07 00:59:43,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:43,882 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:43,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:43,884 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:43,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-07 00:59:44,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:44,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:44,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:44,959 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:44,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:45,236 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:45,236 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:45,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [277151925] [2021-11-07 00:59:45,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [277151925] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:45,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1952943786] [2021-11-07 00:59:45,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:45,236 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:45,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:45,237 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:45,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-07 00:59:46,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:46,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:59:46,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:46,928 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:46,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:47,388 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:47,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1952943786] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:47,389 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:47,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:59:47,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729221131] [2021-11-07 00:59:47,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:59:47,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:47,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:59:47,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:59:47,392 INFO L87 Difference]: Start difference. First operand 19523 states and 34945 transitions. Second operand has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:08,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:08,442 INFO L93 Difference]: Finished difference Result 40550 states and 72171 transitions. [2021-11-07 01:00:08,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-07 01:00:08,443 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-07 01:00:08,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:08,507 INFO L225 Difference]: With dead ends: 40550 [2021-11-07 01:00:08,507 INFO L226 Difference]: Without dead ends: 40348 [2021-11-07 01:00:08,518 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 368 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=501, Invalid=1479, Unknown=0, NotChecked=0, Total=1980 [2021-11-07 01:00:08,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40348 states. [2021-11-07 01:00:10,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40348 to 38770. [2021-11-07 01:00:10,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38770 states, 38769 states have (on average 1.790812246898295) internal successors, (69428), 38769 states have internal predecessors, (69428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:10,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38770 states to 38770 states and 69428 transitions. [2021-11-07 01:00:10,507 INFO L78 Accepts]: Start accepts. Automaton has 38770 states and 69428 transitions. Word has length 98 [2021-11-07 01:00:10,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:10,507 INFO L470 AbstractCegarLoop]: Abstraction has 38770 states and 69428 transitions. [2021-11-07 01:00:10,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:10,508 INFO L276 IsEmpty]: Start isEmpty. Operand 38770 states and 69428 transitions. [2021-11-07 01:00:10,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-07 01:00:10,564 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:10,564 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:10,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:10,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:10,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:10,971 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:10,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:10,971 INFO L85 PathProgramCache]: Analyzing trace with hash -663332174, now seen corresponding path program 1 times [2021-11-07 01:00:10,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:10,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1887441546] [2021-11-07 01:00:10,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:10,972 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:10,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:10,973 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:10,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-07 01:00:11,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:11,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:11,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:12,361 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:12,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:12,627 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:12,627 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:12,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1887441546] [2021-11-07 01:00:12,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1887441546] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:12,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [862815841] [2021-11-07 01:00:12,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:12,627 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:12,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:12,628 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:12,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-07 01:00:13,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:13,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:00:13,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:14,148 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:14,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:14,397 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:14,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [862815841] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:14,398 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:14,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:00:14,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275448117] [2021-11-07 01:00:14,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:00:14,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:14,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:00:14,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:00:14,400 INFO L87 Difference]: Start difference. First operand 38770 states and 69428 transitions. Second operand has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:18,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:18,138 INFO L93 Difference]: Finished difference Result 39166 states and 70060 transitions. [2021-11-07 01:00:18,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:00:18,139 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-07 01:00:18,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:18,194 INFO L225 Difference]: With dead ends: 39166 [2021-11-07 01:00:18,194 INFO L226 Difference]: Without dead ends: 38764 [2021-11-07 01:00:18,204 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:00:18,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38764 states. [2021-11-07 01:00:20,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38764 to 38740. [2021-11-07 01:00:20,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38740 states, 38739 states have (on average 1.790572807764785) internal successors, (69365), 38739 states have internal predecessors, (69365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:20,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38740 states to 38740 states and 69365 transitions. [2021-11-07 01:00:20,315 INFO L78 Accepts]: Start accepts. Automaton has 38740 states and 69365 transitions. Word has length 98 [2021-11-07 01:00:20,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:20,315 INFO L470 AbstractCegarLoop]: Abstraction has 38740 states and 69365 transitions. [2021-11-07 01:00:20,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:20,315 INFO L276 IsEmpty]: Start isEmpty. Operand 38740 states and 69365 transitions. [2021-11-07 01:00:20,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-07 01:00:20,353 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:20,353 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:20,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:20,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:20,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:20,754 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:20,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:20,754 INFO L85 PathProgramCache]: Analyzing trace with hash -106626678, now seen corresponding path program 1 times [2021-11-07 01:00:20,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:20,755 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1873950978] [2021-11-07 01:00:20,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:20,755 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:20,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:20,767 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:20,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-07 01:00:21,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:21,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:21,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:22,225 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:22,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:22,534 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:22,534 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:22,535 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1873950978] [2021-11-07 01:00:22,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1873950978] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:22,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [524218167] [2021-11-07 01:00:22,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:22,536 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:22,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:22,537 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:22,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-07 01:00:24,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:24,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:00:24,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:24,855 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:24,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:25,336 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:25,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [524218167] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:25,337 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:25,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:00:25,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77159635] [2021-11-07 01:00:25,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:00:25,338 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:25,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:00:25,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:00:25,339 INFO L87 Difference]: Start difference. First operand 38740 states and 69365 transitions. Second operand has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:46,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:46,625 INFO L93 Difference]: Finished difference Result 80345 states and 143062 transitions. [2021-11-07 01:00:46,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-07 01:00:46,626 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-07 01:00:46,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:46,766 INFO L225 Difference]: With dead ends: 80345 [2021-11-07 01:00:46,766 INFO L226 Difference]: Without dead ends: 79971 [2021-11-07 01:00:46,784 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 368 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=501, Invalid=1479, Unknown=0, NotChecked=0, Total=1980 [2021-11-07 01:00:46,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79971 states. [2021-11-07 01:00:50,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79971 to 77123. [2021-11-07 01:00:50,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77123 states, 77122 states have (on average 1.790954591426571) internal successors, (138122), 77122 states have internal predecessors, (138122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:51,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77123 states to 77123 states and 138122 transitions. [2021-11-07 01:00:51,257 INFO L78 Accepts]: Start accepts. Automaton has 77123 states and 138122 transitions. Word has length 98 [2021-11-07 01:00:51,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:51,257 INFO L470 AbstractCegarLoop]: Abstraction has 77123 states and 138122 transitions. [2021-11-07 01:00:51,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:51,258 INFO L276 IsEmpty]: Start isEmpty. Operand 77123 states and 138122 transitions. [2021-11-07 01:00:51,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-07 01:00:51,329 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:51,330 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:51,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 0 [2021-11-07 01:00:51,550 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:51,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:51,736 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:51,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:51,736 INFO L85 PathProgramCache]: Analyzing trace with hash 1552146762, now seen corresponding path program 1 times [2021-11-07 01:00:51,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:51,737 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1382031473] [2021-11-07 01:00:51,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:51,737 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:51,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:51,738 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:51,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-07 01:00:53,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:53,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:53,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:53,303 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:53,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:53,571 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:53,571 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:53,571 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1382031473] [2021-11-07 01:00:53,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1382031473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:53,571 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1741412981] [2021-11-07 01:00:53,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:53,572 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:53,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:53,573 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:53,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-07 01:00:55,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:55,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 01:00:55,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:55,448 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:55,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:55,953 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:55,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1741412981] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:55,953 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:55,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 20 [2021-11-07 01:00:55,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287767607] [2021-11-07 01:00:55,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-07 01:00:55,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:55,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-07 01:00:55,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-11-07 01:00:55,955 INFO L87 Difference]: Start difference. First operand 77123 states and 138122 transitions. Second operand has 14 states, 14 states have (on average 10.5) internal successors, (147), 14 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:06,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:06,333 INFO L93 Difference]: Finished difference Result 83282 states and 147417 transitions. [2021-11-07 01:01:06,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 01:01:06,333 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 10.5) internal successors, (147), 14 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-07 01:01:06,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:06,504 INFO L225 Difference]: With dead ends: 83282 [2021-11-07 01:01:06,504 INFO L226 Difference]: Without dead ends: 82765 [2021-11-07 01:01:06,521 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 371 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=570, Invalid=1782, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 01:01:06,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82765 states. [2021-11-07 01:01:11,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82765 to 77163. [2021-11-07 01:01:11,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77163 states, 77162 states have (on average 1.7905445685700214) internal successors, (138162), 77162 states have internal predecessors, (138162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:11,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77163 states to 77163 states and 138162 transitions. [2021-11-07 01:01:11,766 INFO L78 Accepts]: Start accepts. Automaton has 77163 states and 138162 transitions. Word has length 98 [2021-11-07 01:01:11,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:11,766 INFO L470 AbstractCegarLoop]: Abstraction has 77163 states and 138162 transitions. [2021-11-07 01:01:11,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 10.5) internal successors, (147), 14 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:11,767 INFO L276 IsEmpty]: Start isEmpty. Operand 77163 states and 138162 transitions. [2021-11-07 01:01:11,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-07 01:01:11,840 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:11,841 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:11,858 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:12,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:12,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:01:12,241 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:12,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:12,242 INFO L85 PathProgramCache]: Analyzing trace with hash 2136536303, now seen corresponding path program 1 times [2021-11-07 01:01:12,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:01:12,243 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [121240308] [2021-11-07 01:01:12,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:12,243 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:01:12,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:01:12,244 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:01:12,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-07 01:01:13,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:13,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 570 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:01:13,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:13,948 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:13,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:14,307 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:14,308 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:01:14,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [121240308] [2021-11-07 01:01:14,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [121240308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:01:14,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1069439354] [2021-11-07 01:01:14,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:14,308 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:01:14,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:01:14,309 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:01:14,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-07 01:01:16,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:16,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 570 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-07 01:01:16,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:16,524 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:16,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:17,005 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:17,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1069439354] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:01:17,006 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:01:17,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [5, 5] total 24 [2021-11-07 01:01:17,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085644334] [2021-11-07 01:01:17,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:01:17,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:01:17,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:01:17,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=491, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:01:17,008 INFO L87 Difference]: Start difference. First operand 77163 states and 138162 transitions. Second operand has 18 states, 18 states have (on average 8.555555555555555) internal successors, (154), 18 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:29,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:29,981 INFO L93 Difference]: Finished difference Result 86063 states and 151232 transitions. [2021-11-07 01:01:29,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-07 01:01:29,981 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.555555555555555) internal successors, (154), 18 states have internal predecessors, (154), 0 states have call successors, (0), 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 99 [2021-11-07 01:01:29,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:30,106 INFO L225 Difference]: With dead ends: 86063 [2021-11-07 01:01:30,106 INFO L226 Difference]: Without dead ends: 85730 [2021-11-07 01:01:30,125 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 371 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1497 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1504, Invalid=4976, Unknown=0, NotChecked=0, Total=6480 [2021-11-07 01:01:30,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85730 states. [2021-11-07 01:01:35,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85730 to 77523. [2021-11-07 01:01:35,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77523 states, 77522 states have (on average 1.7897629060137767) internal successors, (138746), 77522 states have internal predecessors, (138746), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:35,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77523 states to 77523 states and 138746 transitions. [2021-11-07 01:01:35,242 INFO L78 Accepts]: Start accepts. Automaton has 77523 states and 138746 transitions. Word has length 99 [2021-11-07 01:01:35,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:35,242 INFO L470 AbstractCegarLoop]: Abstraction has 77523 states and 138746 transitions. [2021-11-07 01:01:35,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.555555555555555) internal successors, (154), 18 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:35,242 INFO L276 IsEmpty]: Start isEmpty. Operand 77523 states and 138746 transitions. [2021-11-07 01:01:35,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-07 01:01:35,295 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:35,295 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:35,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:35,514 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (31)] Ended with exit code 0 [2021-11-07 01:01:35,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:01:35,709 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:35,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:35,709 INFO L85 PathProgramCache]: Analyzing trace with hash -295949803, now seen corresponding path program 1 times [2021-11-07 01:01:35,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:01:35,710 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [109337180] [2021-11-07 01:01:35,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:35,710 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:01:35,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:01:35,711 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:01:35,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fee1c526-19b9-4c67-b732-2af73a4494ff/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-07 01:01:37,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:37,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 570 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:01:37,384 INFO L286 TraceCheckSpWp]: Computing forward predicates...