./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec4_product29.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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec4_product29.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/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 71f8755187e6ba7ba58a893461c08a19c806970ccaa90de1a74095d8e9221b58 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:56:11,272 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:56:11,275 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:56:11,328 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:56:11,329 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:56:11,333 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:56:11,335 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:56:11,340 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:56:11,343 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:56:11,349 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:56:11,350 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:56:11,353 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:56:11,353 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:56:11,356 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:56:11,358 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:56:11,367 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:56:11,369 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:56:11,370 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:56:11,372 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:56:11,380 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:56:11,382 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:56:11,384 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:56:11,387 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:56:11,388 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:56:11,397 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:56:11,398 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:56:11,398 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:56:11,401 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:56:11,401 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:56:11,403 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:56:11,404 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:56:11,405 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:56:11,407 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:56:11,409 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:56:11,410 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:56:11,411 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:56:11,412 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:56:11,412 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:56:11,412 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:56:11,413 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:56:11,414 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:56:11,415 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:56:11,462 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:56:11,463 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:56:11,465 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:56:11,465 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:56:11,466 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:56:11,466 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:56:11,466 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:56:11,466 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:56:11,467 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:56:11,467 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:56:11,468 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:56:11,468 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:56:11,469 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:56:11,469 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:56:11,469 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:56:11,470 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:56:11,470 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:56:11,470 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:56:11,471 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:56:11,471 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:56:11,471 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:56:11,471 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:56:11,472 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:56:11,472 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:56:11,472 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:56:11,472 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:56:11,472 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:56:11,473 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:56:11,483 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:56:11,484 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:56:11,484 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:56:11,484 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:56:11,485 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:56:11,485 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:56:11,485 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:56:11,486 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:56:11,486 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:56:11,486 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:56:11,486 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:56:11,486 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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71f8755187e6ba7ba58a893461c08a19c806970ccaa90de1a74095d8e9221b58 [2021-11-07 01:56:11,818 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:56:11,855 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:56:11,858 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:56:11,860 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:56:11,861 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:56:11,862 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec4_product29.cil.c [2021-11-07 01:56:11,928 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data/38f1bd0c6/eaa3e4b1e33a47e08a76eb5e3799de94/FLAG277280374 [2021-11-07 01:56:12,557 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:56:12,565 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/sv-benchmarks/c/product-lines/email_spec4_product29.cil.c [2021-11-07 01:56:12,603 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data/38f1bd0c6/eaa3e4b1e33a47e08a76eb5e3799de94/FLAG277280374 [2021-11-07 01:56:12,768 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data/38f1bd0c6/eaa3e4b1e33a47e08a76eb5e3799de94 [2021-11-07 01:56:12,770 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:56:12,772 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:56:12,773 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:56:12,773 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:56:12,778 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:56:12,780 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:56:12" (1/1) ... [2021-11-07 01:56:12,781 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c25ebaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:12, skipping insertion in model container [2021-11-07 01:56:12,781 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:56:12" (1/1) ... [2021-11-07 01:56:12,787 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:56:12,876 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:56:13,484 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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/sv-benchmarks/c/product-lines/email_spec4_product29.cil.c[58438,58451] [2021-11-07 01:56:13,545 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:56:13,562 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 01:56:13,563 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@68752ba2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:13, skipping insertion in model container [2021-11-07 01:56:13,563 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:56:13,563 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 01:56:13,566 INFO L168 Benchmark]: Toolchain (without parser) took 792.53 ms. Allocated memory is still 96.5 MB. Free memory was 72.7 MB in the beginning and 56.7 MB in the end (delta: 16.0 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2021-11-07 01:56:13,568 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 96.5 MB. Free memory was 70.0 MB in the beginning and 69.9 MB in the end (delta: 100.7 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:56:13,570 INFO L168 Benchmark]: CACSL2BoogieTranslator took 790.15 ms. Allocated memory is still 96.5 MB. Free memory was 72.4 MB in the beginning and 56.7 MB in the end (delta: 15.7 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2021-11-07 01:56:13,572 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 96.5 MB. Free memory was 70.0 MB in the beginning and 69.9 MB in the end (delta: 100.7 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 790.15 ms. Allocated memory is still 96.5 MB. Free memory was 72.4 MB in the beginning and 56.7 MB in the end (delta: 15.7 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 397]: 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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec4_product29.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/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 71f8755187e6ba7ba58a893461c08a19c806970ccaa90de1a74095d8e9221b58 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:56:15,874 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:56:15,877 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:56:15,928 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:56:15,929 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:56:15,935 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:56:15,939 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:56:15,948 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:56:15,952 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:56:15,963 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:56:15,964 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:56:15,967 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:56:15,969 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:56:15,971 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:56:15,973 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:56:15,975 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:56:15,976 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:56:15,977 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:56:15,979 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:56:15,982 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:56:15,984 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:56:15,986 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:56:15,987 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:56:15,989 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:56:15,992 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:56:15,993 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:56:15,994 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:56:15,995 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:56:15,995 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:56:15,997 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:56:15,997 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:56:15,999 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:56:16,000 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:56:16,001 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:56:16,003 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:56:16,003 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:56:16,004 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:56:16,004 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:56:16,005 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:56:16,006 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:56:16,007 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:56:16,008 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 01:56:16,037 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:56:16,037 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:56:16,038 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:56:16,038 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:56:16,039 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:56:16,039 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:56:16,039 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:56:16,039 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:56:16,039 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:56:16,040 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:56:16,041 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:56:16,041 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:56:16,041 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:56:16,041 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:56:16,041 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:56:16,042 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:56:16,042 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:56:16,042 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 01:56:16,042 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 01:56:16,042 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:56:16,042 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:56:16,043 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:56:16,043 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:56:16,043 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:56:16,043 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 01:56:16,044 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:56:16,044 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:56:16,044 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:56:16,044 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:56:16,044 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:56:16,045 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 01:56:16,045 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 01:56:16,045 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:56:16,045 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:56:16,048 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:56:16,048 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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71f8755187e6ba7ba58a893461c08a19c806970ccaa90de1a74095d8e9221b58 [2021-11-07 01:56:16,438 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:56:16,463 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:56:16,466 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:56:16,467 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:56:16,469 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:56:16,470 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec4_product29.cil.c [2021-11-07 01:56:16,557 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data/e157e012b/50b8174bf532436c9f8e08ad0c75bd9c/FLAGef3204cd1 [2021-11-07 01:56:17,254 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:56:17,255 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/sv-benchmarks/c/product-lines/email_spec4_product29.cil.c [2021-11-07 01:56:17,298 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data/e157e012b/50b8174bf532436c9f8e08ad0c75bd9c/FLAGef3204cd1 [2021-11-07 01:56:17,438 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/data/e157e012b/50b8174bf532436c9f8e08ad0c75bd9c [2021-11-07 01:56:17,447 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:56:17,449 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:56:17,451 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:56:17,452 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:56:17,457 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:56:17,458 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:56:17" (1/1) ... [2021-11-07 01:56:17,460 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4fdf257a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:17, skipping insertion in model container [2021-11-07 01:56:17,460 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:56:17" (1/1) ... [2021-11-07 01:56:17,472 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:56:17,569 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:56:18,119 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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/sv-benchmarks/c/product-lines/email_spec4_product29.cil.c[58438,58451] [2021-11-07 01:56:18,151 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:56:18,176 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 01:56:18,210 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:56:18,325 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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/sv-benchmarks/c/product-lines/email_spec4_product29.cil.c[58438,58451] [2021-11-07 01:56:18,336 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:56:18,342 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:56:18,422 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_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/sv-benchmarks/c/product-lines/email_spec4_product29.cil.c[58438,58451] [2021-11-07 01:56:18,430 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:56:18,467 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:56:18,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18 WrapperNode [2021-11-07 01:56:18,467 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:56:18,468 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:56:18,469 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:56:18,469 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:56:18,476 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,509 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,646 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:56:18,647 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:56:18,647 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:56:18,647 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:56:18,656 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,656 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,668 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,669 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,725 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,760 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,769 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,785 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:56:18,786 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:56:18,787 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:56:18,787 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:56:18,788 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (1/1) ... [2021-11-07 01:56:18,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:56:18,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:56:18,819 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:56:18,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:56:18,868 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 01:56:18,868 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:56:18,869 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 01:56:18,869 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:56:18,869 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:56:24,987 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:56:24,988 INFO L299 CfgBuilder]: Removed 605 assume(true) statements. [2021-11-07 01:56:24,992 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:56:24 BoogieIcfgContainer [2021-11-07 01:56:24,992 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:56:24,994 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:56:24,994 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:56:24,997 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:56:24,998 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:56:17" (1/3) ... [2021-11-07 01:56:24,998 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74f789c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:56:24, skipping insertion in model container [2021-11-07 01:56:24,999 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:56:18" (2/3) ... [2021-11-07 01:56:24,999 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74f789c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:56:24, skipping insertion in model container [2021-11-07 01:56:24,999 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:56:24" (3/3) ... [2021-11-07 01:56:25,001 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec4_product29.cil.c [2021-11-07 01:56:25,022 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:56:25,023 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-07 01:56:25,099 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:56:25,106 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 01:56:25,106 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-07 01:56:25,149 INFO L276 IsEmpty]: Start isEmpty. Operand has 1004 states, 997 states have (on average 1.7642928786359078) internal successors, (1759), 1003 states have internal predecessors, (1759), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:25,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 01:56:25,165 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:25,166 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:25,167 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:25,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:25,174 INFO L85 PathProgramCache]: Analyzing trace with hash -1476517714, now seen corresponding path program 1 times [2021-11-07 01:56:25,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:25,201 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1927007385] [2021-11-07 01:56:25,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:25,203 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:25,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:25,210 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:25,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 01:56:25,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:25,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 01:56:25,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:25,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:25,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:25,997 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:25,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1927007385] [2021-11-07 01:56:25,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1927007385] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:25,998 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:25,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 01:56:26,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123273923] [2021-11-07 01:56:26,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 01:56:26,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:26,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 01:56:26,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:56:26,031 INFO L87 Difference]: Start difference. First operand has 1004 states, 997 states have (on average 1.7642928786359078) internal successors, (1759), 1003 states have internal predecessors, (1759), 0 states have call successors, (0), 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 25.0) internal successors, (50), 2 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:26,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:26,154 INFO L93 Difference]: Finished difference Result 1727 states and 3002 transitions. [2021-11-07 01:56:26,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 01:56:26,156 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 25.0) internal successors, (50), 2 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-07 01:56:26,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:26,184 INFO L225 Difference]: With dead ends: 1727 [2021-11-07 01:56:26,184 INFO L226 Difference]: Without dead ends: 876 [2021-11-07 01:56:26,194 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:56:26,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 876 states. [2021-11-07 01:56:26,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 876 to 876. [2021-11-07 01:56:26,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 876 states, 870 states have (on average 1.7586206896551724) internal successors, (1530), 875 states have internal predecessors, (1530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:26,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 876 states to 876 states and 1530 transitions. [2021-11-07 01:56:26,309 INFO L78 Accepts]: Start accepts. Automaton has 876 states and 1530 transitions. Word has length 50 [2021-11-07 01:56:26,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:26,310 INFO L470 AbstractCegarLoop]: Abstraction has 876 states and 1530 transitions. [2021-11-07 01:56:26,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 25.0) internal successors, (50), 2 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:26,310 INFO L276 IsEmpty]: Start isEmpty. Operand 876 states and 1530 transitions. [2021-11-07 01:56:26,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 01:56:26,316 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:26,316 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] [2021-11-07 01:56:26,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:26,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:26,523 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:26,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:26,524 INFO L85 PathProgramCache]: Analyzing trace with hash -2109746277, now seen corresponding path program 1 times [2021-11-07 01:56:26,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:26,526 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [323125694] [2021-11-07 01:56:26,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:26,526 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:26,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:26,528 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:26,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 01:56:26,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:27,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:56:27,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:27,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:27,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:27,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:27,362 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:27,362 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [323125694] [2021-11-07 01:56:27,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [323125694] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:27,362 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:27,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:56:27,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604508] [2021-11-07 01:56:27,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:56:27,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:27,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:56:27,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:56:27,371 INFO L87 Difference]: Start difference. First operand 876 states and 1530 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:27,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:27,561 INFO L93 Difference]: Finished difference Result 2598 states and 4542 transitions. [2021-11-07 01:56:27,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:56:27,562 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 01:56:27,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:27,577 INFO L225 Difference]: With dead ends: 2598 [2021-11-07 01:56:27,577 INFO L226 Difference]: Without dead ends: 1737 [2021-11-07 01:56:27,581 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:56:27,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1737 states. [2021-11-07 01:56:27,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1737 to 875. [2021-11-07 01:56:27,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 875 states, 869 states have (on average 1.754890678941312) internal successors, (1525), 874 states have internal predecessors, (1525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:27,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 875 states to 875 states and 1525 transitions. [2021-11-07 01:56:27,692 INFO L78 Accepts]: Start accepts. Automaton has 875 states and 1525 transitions. Word has length 51 [2021-11-07 01:56:27,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:27,693 INFO L470 AbstractCegarLoop]: Abstraction has 875 states and 1525 transitions. [2021-11-07 01:56:27,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:27,694 INFO L276 IsEmpty]: Start isEmpty. Operand 875 states and 1525 transitions. [2021-11-07 01:56:27,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 01:56:27,709 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:27,709 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] [2021-11-07 01:56:27,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:27,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:27,925 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:27,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:27,926 INFO L85 PathProgramCache]: Analyzing trace with hash -1414580863, now seen corresponding path program 1 times [2021-11-07 01:56:27,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:27,927 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1917405017] [2021-11-07 01:56:27,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:27,928 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:27,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:27,930 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:27,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 01:56:28,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:28,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:56:28,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:28,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:28,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:28,779 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:28,779 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:28,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1917405017] [2021-11-07 01:56:28,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1917405017] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:28,780 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:28,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:56:28,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136460909] [2021-11-07 01:56:28,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:56:28,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:28,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:56:28,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:56:28,786 INFO L87 Difference]: Start difference. First operand 875 states and 1525 transitions. Second operand has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:29,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:29,272 INFO L93 Difference]: Finished difference Result 3417 states and 5962 transitions. [2021-11-07 01:56:29,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:56:29,272 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 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 53 [2021-11-07 01:56:29,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:29,290 INFO L225 Difference]: With dead ends: 3417 [2021-11-07 01:56:29,290 INFO L226 Difference]: Without dead ends: 2560 [2021-11-07 01:56:29,292 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:56:29,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2560 states. [2021-11-07 01:56:29,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2560 to 874. [2021-11-07 01:56:29,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 874 states, 868 states have (on average 1.7523041474654377) internal successors, (1521), 873 states have internal predecessors, (1521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:29,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 1521 transitions. [2021-11-07 01:56:29,377 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 1521 transitions. Word has length 53 [2021-11-07 01:56:29,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:29,378 INFO L470 AbstractCegarLoop]: Abstraction has 874 states and 1521 transitions. [2021-11-07 01:56:29,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:29,380 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 1521 transitions. [2021-11-07 01:56:29,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 01:56:29,382 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:29,382 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:29,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:29,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:29,602 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:29,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:29,603 INFO L85 PathProgramCache]: Analyzing trace with hash 1509707860, now seen corresponding path program 1 times [2021-11-07 01:56:29,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:29,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1082233549] [2021-11-07 01:56:29,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:29,604 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:29,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:29,606 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:29,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 01:56:30,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:30,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:56:30,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:30,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:30,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:30,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:30,453 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:30,454 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1082233549] [2021-11-07 01:56:30,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1082233549] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:30,454 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:30,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:56:30,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221539820] [2021-11-07 01:56:30,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:56:30,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:30,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:56:30,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:56:30,459 INFO L87 Difference]: Start difference. First operand 874 states and 1521 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:30,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:30,577 INFO L93 Difference]: Finished difference Result 1745 states and 3039 transitions. [2021-11-07 01:56:30,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:56:30,578 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-07 01:56:30,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:30,585 INFO L225 Difference]: With dead ends: 1745 [2021-11-07 01:56:30,585 INFO L226 Difference]: Without dead ends: 879 [2021-11-07 01:56:30,587 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:56:30,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 879 states. [2021-11-07 01:56:30,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 879 to 874. [2021-11-07 01:56:30,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 874 states, 868 states have (on average 1.7488479262672811) internal successors, (1518), 873 states have internal predecessors, (1518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:30,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 1518 transitions. [2021-11-07 01:56:30,652 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 1518 transitions. Word has length 54 [2021-11-07 01:56:30,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:30,654 INFO L470 AbstractCegarLoop]: Abstraction has 874 states and 1518 transitions. [2021-11-07 01:56:30,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:30,655 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 1518 transitions. [2021-11-07 01:56:30,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 01:56:30,658 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:30,659 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:30,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:30,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:30,873 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:30,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:30,874 INFO L85 PathProgramCache]: Analyzing trace with hash -123627927, now seen corresponding path program 1 times [2021-11-07 01:56:30,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:30,875 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1538556247] [2021-11-07 01:56:30,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:30,876 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:30,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:30,877 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:30,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 01:56:31,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:31,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:56:31,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:31,571 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 01:56:31,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:31,755 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:31,755 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:31,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1538556247] [2021-11-07 01:56:31,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1538556247] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:31,756 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:31,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:56:31,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341531243] [2021-11-07 01:56:31,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:56:31,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:31,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:56:31,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:56:31,757 INFO L87 Difference]: Start difference. First operand 874 states and 1518 transitions. Second operand has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:32,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:32,089 INFO L93 Difference]: Finished difference Result 3404 states and 5938 transitions. [2021-11-07 01:56:32,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:56:32,090 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 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 55 [2021-11-07 01:56:32,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:32,108 INFO L225 Difference]: With dead ends: 3404 [2021-11-07 01:56:32,109 INFO L226 Difference]: Without dead ends: 2556 [2021-11-07 01:56:32,111 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:56:32,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2556 states. [2021-11-07 01:56:32,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2556 to 874. [2021-11-07 01:56:32,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 874 states, 868 states have (on average 1.7453917050691243) internal successors, (1515), 873 states have internal predecessors, (1515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:32,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 1515 transitions. [2021-11-07 01:56:32,210 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 1515 transitions. Word has length 55 [2021-11-07 01:56:32,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:32,211 INFO L470 AbstractCegarLoop]: Abstraction has 874 states and 1515 transitions. [2021-11-07 01:56:32,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:32,211 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 1515 transitions. [2021-11-07 01:56:32,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 01:56:32,213 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:32,213 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:32,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:32,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:32,432 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:32,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:32,433 INFO L85 PathProgramCache]: Analyzing trace with hash -1402186588, now seen corresponding path program 1 times [2021-11-07 01:56:32,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:32,434 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1251506970] [2021-11-07 01:56:32,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:32,434 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:32,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:32,437 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:32,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 01:56:32,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:32,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:56:32,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:33,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:33,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:33,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:33,281 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:33,281 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1251506970] [2021-11-07 01:56:33,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1251506970] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:33,282 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:33,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:56:33,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722863328] [2021-11-07 01:56:33,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:56:33,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:33,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:56:33,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:56:33,290 INFO L87 Difference]: Start difference. First operand 874 states and 1515 transitions. Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 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 01:56:33,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:33,483 INFO L93 Difference]: Finished difference Result 2317 states and 4017 transitions. [2021-11-07 01:56:33,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:56:33,484 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 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 57 [2021-11-07 01:56:33,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:33,495 INFO L225 Difference]: With dead ends: 2317 [2021-11-07 01:56:33,496 INFO L226 Difference]: Without dead ends: 1722 [2021-11-07 01:56:33,497 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:56:33,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1722 states. [2021-11-07 01:56:33,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1722 to 1127. [2021-11-07 01:56:33,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1127 states, 1121 states have (on average 1.7671721677074042) internal successors, (1981), 1126 states have internal predecessors, (1981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:33,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1127 states to 1127 states and 1981 transitions. [2021-11-07 01:56:33,599 INFO L78 Accepts]: Start accepts. Automaton has 1127 states and 1981 transitions. Word has length 57 [2021-11-07 01:56:33,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:33,600 INFO L470 AbstractCegarLoop]: Abstraction has 1127 states and 1981 transitions. [2021-11-07 01:56:33,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 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 01:56:33,600 INFO L276 IsEmpty]: Start isEmpty. Operand 1127 states and 1981 transitions. [2021-11-07 01:56:33,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:56:33,603 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:33,603 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:33,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:33,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:33,818 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:33,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:33,819 INFO L85 PathProgramCache]: Analyzing trace with hash -1855466091, now seen corresponding path program 1 times [2021-11-07 01:56:33,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:33,819 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [890901090] [2021-11-07 01:56:33,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:33,820 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:33,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:33,821 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:33,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 01:56:34,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:34,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:56:34,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:34,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:34,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:34,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:34,701 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:34,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [890901090] [2021-11-07 01:56:34,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [890901090] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:34,701 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:34,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:56:34,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151454401] [2021-11-07 01:56:34,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:56:34,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:34,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:56:34,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:34,703 INFO L87 Difference]: Start difference. First operand 1127 states and 1981 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:34,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:34,849 INFO L93 Difference]: Finished difference Result 2966 states and 5216 transitions. [2021-11-07 01:56:34,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:56:34,850 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 01:56:34,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:34,864 INFO L225 Difference]: With dead ends: 2966 [2021-11-07 01:56:34,864 INFO L226 Difference]: Without dead ends: 1923 [2021-11-07 01:56:34,868 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:34,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1923 states. [2021-11-07 01:56:35,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1923 to 1328. [2021-11-07 01:56:35,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1328 states, 1322 states have (on average 1.7776096822995462) internal successors, (2350), 1327 states have internal predecessors, (2350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:35,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1328 states to 1328 states and 2350 transitions. [2021-11-07 01:56:35,013 INFO L78 Accepts]: Start accepts. Automaton has 1328 states and 2350 transitions. Word has length 69 [2021-11-07 01:56:35,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:35,015 INFO L470 AbstractCegarLoop]: Abstraction has 1328 states and 2350 transitions. [2021-11-07 01:56:35,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:35,016 INFO L276 IsEmpty]: Start isEmpty. Operand 1328 states and 2350 transitions. [2021-11-07 01:56:35,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 01:56:35,019 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:35,019 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:35,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:35,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:35,235 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:35,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:35,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1941524020, now seen corresponding path program 1 times [2021-11-07 01:56:35,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:35,236 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1599776994] [2021-11-07 01:56:35,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:35,236 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:35,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:35,240 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:35,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:56:35,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:35,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:56:35,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:36,068 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:36,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:36,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:36,269 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:36,269 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1599776994] [2021-11-07 01:56:36,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1599776994] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:36,270 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:36,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:56:36,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096116567] [2021-11-07 01:56:36,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:56:36,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:36,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:56:36,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:36,272 INFO L87 Difference]: Start difference. First operand 1328 states and 2350 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:36,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:36,476 INFO L93 Difference]: Finished difference Result 3613 states and 6409 transitions. [2021-11-07 01:56:36,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:56:36,477 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-07 01:56:36,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:36,495 INFO L225 Difference]: With dead ends: 3613 [2021-11-07 01:56:36,496 INFO L226 Difference]: Without dead ends: 2373 [2021-11-07 01:56:36,502 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:36,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2373 states. [2021-11-07 01:56:36,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2373 to 1778. [2021-11-07 01:56:36,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1778 states, 1772 states have (on average 1.7934537246049662) internal successors, (3178), 1777 states have internal predecessors, (3178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:36,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1778 states to 1778 states and 3178 transitions. [2021-11-07 01:56:36,683 INFO L78 Accepts]: Start accepts. Automaton has 1778 states and 3178 transitions. Word has length 70 [2021-11-07 01:56:36,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:36,684 INFO L470 AbstractCegarLoop]: Abstraction has 1778 states and 3178 transitions. [2021-11-07 01:56:36,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:36,684 INFO L276 IsEmpty]: Start isEmpty. Operand 1778 states and 3178 transitions. [2021-11-07 01:56:36,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:56:36,688 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:36,688 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:36,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:36,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:36,912 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:36,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:36,912 INFO L85 PathProgramCache]: Analyzing trace with hash -180633084, now seen corresponding path program 1 times [2021-11-07 01:56:36,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:36,913 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [966227177] [2021-11-07 01:56:36,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:36,913 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:36,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:36,916 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:36,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 01:56:37,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:37,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:56:37,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:37,690 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:37,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:37,890 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:37,890 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:37,890 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [966227177] [2021-11-07 01:56:37,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [966227177] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:37,891 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:37,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:56:37,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416974397] [2021-11-07 01:56:37,892 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:56:37,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:37,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:56:37,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:56:37,893 INFO L87 Difference]: Start difference. First operand 1778 states and 3178 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:38,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:38,095 INFO L93 Difference]: Finished difference Result 3866 states and 6872 transitions. [2021-11-07 01:56:38,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:56:38,095 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-07 01:56:38,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:38,111 INFO L225 Difference]: With dead ends: 3866 [2021-11-07 01:56:38,111 INFO L226 Difference]: Without dead ends: 2373 [2021-11-07 01:56:38,114 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:56:38,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2373 states. [2021-11-07 01:56:38,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2373 to 1778. [2021-11-07 01:56:38,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1778 states, 1772 states have (on average 1.7923250564334086) internal successors, (3176), 1777 states have internal predecessors, (3176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:38,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1778 states to 1778 states and 3176 transitions. [2021-11-07 01:56:38,311 INFO L78 Accepts]: Start accepts. Automaton has 1778 states and 3176 transitions. Word has length 71 [2021-11-07 01:56:38,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:38,312 INFO L470 AbstractCegarLoop]: Abstraction has 1778 states and 3176 transitions. [2021-11-07 01:56:38,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:38,313 INFO L276 IsEmpty]: Start isEmpty. Operand 1778 states and 3176 transitions. [2021-11-07 01:56:38,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:56:38,322 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:38,322 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:38,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:38,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:38,537 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:38,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:38,537 INFO L85 PathProgramCache]: Analyzing trace with hash -2132924605, now seen corresponding path program 1 times [2021-11-07 01:56:38,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:38,538 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [185578548] [2021-11-07 01:56:38,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:38,538 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:38,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:38,540 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:38,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 01:56:39,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:39,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:56:39,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:39,318 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:39,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:39,513 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:39,514 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:39,514 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [185578548] [2021-11-07 01:56:39,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [185578548] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:39,514 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:39,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:56:39,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502195621] [2021-11-07 01:56:39,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:56:39,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:39,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:56:39,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:39,516 INFO L87 Difference]: Start difference. First operand 1778 states and 3176 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:39,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:39,752 INFO L93 Difference]: Finished difference Result 4935 states and 8842 transitions. [2021-11-07 01:56:39,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:56:39,753 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-07 01:56:39,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:39,775 INFO L225 Difference]: With dead ends: 4935 [2021-11-07 01:56:39,776 INFO L226 Difference]: Without dead ends: 3253 [2021-11-07 01:56:39,779 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:39,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3253 states. [2021-11-07 01:56:39,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3253 to 2658. [2021-11-07 01:56:39,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2658 states, 2652 states have (on average 1.8080693815987934) internal successors, (4795), 2657 states have internal predecessors, (4795), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:39,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2658 states to 2658 states and 4795 transitions. [2021-11-07 01:56:39,984 INFO L78 Accepts]: Start accepts. Automaton has 2658 states and 4795 transitions. Word has length 71 [2021-11-07 01:56:39,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:39,984 INFO L470 AbstractCegarLoop]: Abstraction has 2658 states and 4795 transitions. [2021-11-07 01:56:39,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:39,985 INFO L276 IsEmpty]: Start isEmpty. Operand 2658 states and 4795 transitions. [2021-11-07 01:56:39,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:56:39,990 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:39,991 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:40,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:40,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:40,207 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:40,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:40,207 INFO L85 PathProgramCache]: Analyzing trace with hash 646280054, now seen corresponding path program 1 times [2021-11-07 01:56:40,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:40,208 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [781997705] [2021-11-07 01:56:40,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:40,208 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:40,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:40,209 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:40,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 01:56:40,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:40,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:56:40,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:40,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:40,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:41,125 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:41,126 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:41,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [781997705] [2021-11-07 01:56:41,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [781997705] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:41,126 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:41,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:56:41,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180747575] [2021-11-07 01:56:41,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:56:41,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:41,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:56:41,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:41,128 INFO L87 Difference]: Start difference. First operand 2658 states and 4795 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:41,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:41,449 INFO L93 Difference]: Finished difference Result 7311 states and 13218 transitions. [2021-11-07 01:56:41,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:56:41,450 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 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 72 [2021-11-07 01:56:41,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:41,498 INFO L225 Difference]: With dead ends: 7311 [2021-11-07 01:56:41,498 INFO L226 Difference]: Without dead ends: 4783 [2021-11-07 01:56:41,503 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:41,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4783 states. [2021-11-07 01:56:41,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4783 to 4188. [2021-11-07 01:56:41,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4188 states, 4182 states have (on average 1.8192252510760403) internal successors, (7608), 4187 states have internal predecessors, (7608), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:41,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4188 states to 4188 states and 7608 transitions. [2021-11-07 01:56:41,868 INFO L78 Accepts]: Start accepts. Automaton has 4188 states and 7608 transitions. Word has length 72 [2021-11-07 01:56:41,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:41,869 INFO L470 AbstractCegarLoop]: Abstraction has 4188 states and 7608 transitions. [2021-11-07 01:56:41,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:41,870 INFO L276 IsEmpty]: Start isEmpty. Operand 4188 states and 7608 transitions. [2021-11-07 01:56:41,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 01:56:41,880 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:41,880 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:41,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:42,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:42,106 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:42,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:42,106 INFO L85 PathProgramCache]: Analyzing trace with hash 293267220, now seen corresponding path program 1 times [2021-11-07 01:56:42,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:42,107 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1999269384] [2021-11-07 01:56:42,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:42,108 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:42,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:42,109 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:42,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 01:56:42,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:42,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:56:42,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:42,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:42,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:43,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:43,150 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:43,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1999269384] [2021-11-07 01:56:43,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1999269384] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:43,150 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:43,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:56:43,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811489648] [2021-11-07 01:56:43,151 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:56:43,151 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:43,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:56:43,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:43,152 INFO L87 Difference]: Start difference. First operand 4188 states and 7608 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:43,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:43,507 INFO L93 Difference]: Finished difference Result 11617 states and 21140 transitions. [2021-11-07 01:56:43,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:56:43,508 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 01:56:43,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:43,531 INFO L225 Difference]: With dead ends: 11617 [2021-11-07 01:56:43,531 INFO L226 Difference]: Without dead ends: 7593 [2021-11-07 01:56:43,538 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:43,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7593 states. [2021-11-07 01:56:44,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7593 to 6998. [2021-11-07 01:56:44,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6998 states, 6992 states have (on average 1.8262299771167048) internal successors, (12769), 6997 states have internal predecessors, (12769), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:44,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6998 states to 6998 states and 12769 transitions. [2021-11-07 01:56:44,070 INFO L78 Accepts]: Start accepts. Automaton has 6998 states and 12769 transitions. Word has length 73 [2021-11-07 01:56:44,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:44,071 INFO L470 AbstractCegarLoop]: Abstraction has 6998 states and 12769 transitions. [2021-11-07 01:56:44,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:44,072 INFO L276 IsEmpty]: Start isEmpty. Operand 6998 states and 12769 transitions. [2021-11-07 01:56:44,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:56:44,083 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:44,083 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] [2021-11-07 01:56:44,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:44,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:44,302 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:44,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:44,302 INFO L85 PathProgramCache]: Analyzing trace with hash -1892380584, now seen corresponding path program 1 times [2021-11-07 01:56:44,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:44,303 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1420641589] [2021-11-07 01:56:44,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:44,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:44,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:44,304 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:44,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 01:56:44,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:45,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:56:45,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:45,205 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:56:45,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:45,412 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:56:45,413 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:45,413 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1420641589] [2021-11-07 01:56:45,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1420641589] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:45,413 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:45,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:56:45,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044181367] [2021-11-07 01:56:45,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:56:45,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:45,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:56:45,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:56:45,415 INFO L87 Difference]: Start difference. First operand 6998 states and 12769 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:48,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:48,820 INFO L93 Difference]: Finished difference Result 26515 states and 48432 transitions. [2021-11-07 01:56:48,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:56:48,821 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:56:48,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:48,883 INFO L225 Difference]: With dead ends: 26515 [2021-11-07 01:56:48,883 INFO L226 Difference]: Without dead ends: 19800 [2021-11-07 01:56:48,895 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:56:48,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19800 states. [2021-11-07 01:56:49,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19800 to 6948. [2021-11-07 01:56:49,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6948 states, 6942 states have (on average 1.8105733218092768) internal successors, (12569), 6947 states have internal predecessors, (12569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:49,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6948 states to 6948 states and 12569 transitions. [2021-11-07 01:56:49,539 INFO L78 Accepts]: Start accepts. Automaton has 6948 states and 12569 transitions. Word has length 74 [2021-11-07 01:56:49,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:49,540 INFO L470 AbstractCegarLoop]: Abstraction has 6948 states and 12569 transitions. [2021-11-07 01:56:49,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:49,540 INFO L276 IsEmpty]: Start isEmpty. Operand 6948 states and 12569 transitions. [2021-11-07 01:56:49,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:56:49,550 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:49,550 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:56:49,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:49,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:49,766 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:49,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:49,767 INFO L85 PathProgramCache]: Analyzing trace with hash -249050777, now seen corresponding path program 1 times [2021-11-07 01:56:49,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:49,768 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [122713889] [2021-11-07 01:56:49,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:49,768 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:49,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:49,769 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:49,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:56:50,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:50,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:56:50,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:50,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:50,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:51,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:51,032 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:51,032 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [122713889] [2021-11-07 01:56:51,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [122713889] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:51,032 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:56:51,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:56:51,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243653315] [2021-11-07 01:56:51,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:56:51,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:51,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:56:51,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:51,035 INFO L87 Difference]: Start difference. First operand 6948 states and 12569 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:51,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:51,619 INFO L93 Difference]: Finished difference Result 20358 states and 36877 transitions. [2021-11-07 01:56:51,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:56:51,620 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:56:51,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:51,656 INFO L225 Difference]: With dead ends: 20358 [2021-11-07 01:56:51,656 INFO L226 Difference]: Without dead ends: 13577 [2021-11-07 01:56:51,668 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:56:51,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13577 states. [2021-11-07 01:56:52,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13577 to 12982. [2021-11-07 01:56:52,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12982 states, 12976 states have (on average 1.813347718865598) internal successors, (23530), 12981 states have internal predecessors, (23530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:52,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12982 states to 12982 states and 23530 transitions. [2021-11-07 01:56:52,417 INFO L78 Accepts]: Start accepts. Automaton has 12982 states and 23530 transitions. Word has length 74 [2021-11-07 01:56:52,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:52,418 INFO L470 AbstractCegarLoop]: Abstraction has 12982 states and 23530 transitions. [2021-11-07 01:56:52,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:52,418 INFO L276 IsEmpty]: Start isEmpty. Operand 12982 states and 23530 transitions. [2021-11-07 01:56:52,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 01:56:52,433 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:52,433 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] [2021-11-07 01:56:52,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:52,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:56:52,650 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:56:52,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:52,651 INFO L85 PathProgramCache]: Analyzing trace with hash -98421613, now seen corresponding path program 1 times [2021-11-07 01:56:52,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:56:52,651 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [688820000] [2021-11-07 01:56:52,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:52,652 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:56:52,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:56:52,653 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:56:52,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 01:56:53,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:53,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:56:53,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:53,579 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 01:56:53,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:53,865 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 01:56:53,865 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:56:53,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [688820000] [2021-11-07 01:56:53,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [688820000] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:56:53,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [837298963] [2021-11-07 01:56:53,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:53,866 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:56:53,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:56:53,871 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:56:53,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 01:56:54,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:56:54,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:56:54,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:56:55,078 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:56:55,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:55,443 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 01:56:55,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [837298963] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:56:55,443 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:56:55,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 01:56:55,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061793136] [2021-11-07 01:56:55,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:56:55,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:56:55,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:56:55,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:56:55,445 INFO L87 Difference]: Start difference. First operand 12982 states and 23530 transitions. Second operand has 10 states, 10 states have (on average 11.0) internal successors, (110), 10 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:05,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:57:05,662 INFO L93 Difference]: Finished difference Result 84218 states and 152407 transitions. [2021-11-07 01:57:05,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 01:57:05,663 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 11.0) internal successors, (110), 10 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 01:57:05,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:57:05,883 INFO L225 Difference]: With dead ends: 84218 [2021-11-07 01:57:05,883 INFO L226 Difference]: Without dead ends: 83641 [2021-11-07 01:57:05,904 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 01:57:06,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83641 states. [2021-11-07 01:57:07,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83641 to 25722. [2021-11-07 01:57:07,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25722 states, 25716 states have (on average 1.8142012754705241) internal successors, (46654), 25721 states have internal predecessors, (46654), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:08,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25722 states to 25722 states and 46654 transitions. [2021-11-07 01:57:08,077 INFO L78 Accepts]: Start accepts. Automaton has 25722 states and 46654 transitions. Word has length 75 [2021-11-07 01:57:08,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:57:08,078 INFO L470 AbstractCegarLoop]: Abstraction has 25722 states and 46654 transitions. [2021-11-07 01:57:08,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 11.0) internal successors, (110), 10 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:08,078 INFO L276 IsEmpty]: Start isEmpty. Operand 25722 states and 46654 transitions. [2021-11-07 01:57:08,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 01:57:08,105 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:57:08,105 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] [2021-11-07 01:57:08,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 01:57:08,325 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-11-07 01:57:08,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:57:08,511 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:57:08,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:57:08,511 INFO L85 PathProgramCache]: Analyzing trace with hash 736619414, now seen corresponding path program 1 times [2021-11-07 01:57:08,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:57:08,512 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1384392090] [2021-11-07 01:57:08,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:08,512 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:57:08,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:57:08,514 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:57:08,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:57:09,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:09,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:57:09,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:09,727 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 01:57:09,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:09,942 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 01:57:09,942 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:57:09,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1384392090] [2021-11-07 01:57:09,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1384392090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:57:09,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [895293587] [2021-11-07 01:57:09,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:09,943 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:57:09,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:57:09,944 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:57:09,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:57:10,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:10,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:57:10,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:11,182 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 01:57:11,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:11,438 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 01:57:11,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [895293587] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:57:11,438 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:57:11,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 01:57:11,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136859581] [2021-11-07 01:57:11,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:57:11,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:57:11,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:57:11,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:57:11,448 INFO L87 Difference]: Start difference. First operand 25722 states and 46654 transitions. Second operand has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:14,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:57:14,932 INFO L93 Difference]: Finished difference Result 27348 states and 49423 transitions. [2021-11-07 01:57:14,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:57:14,933 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-07 01:57:14,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:57:14,996 INFO L225 Difference]: With dead ends: 27348 [2021-11-07 01:57:14,996 INFO L226 Difference]: Without dead ends: 26408 [2021-11-07 01:57:15,004 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:57:15,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26408 states. [2021-11-07 01:57:16,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26408 to 25716. [2021-11-07 01:57:16,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25716 states, 25710 states have (on average 1.8141190198366395) internal successors, (46641), 25715 states have internal predecessors, (46641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:16,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25716 states to 25716 states and 46641 transitions. [2021-11-07 01:57:16,497 INFO L78 Accepts]: Start accepts. Automaton has 25716 states and 46641 transitions. Word has length 76 [2021-11-07 01:57:16,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:57:16,498 INFO L470 AbstractCegarLoop]: Abstraction has 25716 states and 46641 transitions. [2021-11-07 01:57:16,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:16,498 INFO L276 IsEmpty]: Start isEmpty. Operand 25716 states and 46641 transitions. [2021-11-07 01:57:16,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 01:57:16,519 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:57:16,519 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] [2021-11-07 01:57:16,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 01:57:16,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 01:57:16,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:57:16,920 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:57:16,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:57:16,921 INFO L85 PathProgramCache]: Analyzing trace with hash -2134404538, now seen corresponding path program 1 times [2021-11-07 01:57:16,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:57:16,921 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [358338739] [2021-11-07 01:57:16,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:16,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:57:16,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:57:16,923 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:57:16,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 01:57:17,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:17,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:57:17,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:17,943 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 01:57:17,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:18,163 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 01:57:18,163 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:57:18,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [358338739] [2021-11-07 01:57:18,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [358338739] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:57:18,164 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:57:18,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 01:57:18,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523145310] [2021-11-07 01:57:18,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:57:18,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:57:18,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:57:18,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:57:18,167 INFO L87 Difference]: Start difference. First operand 25716 states and 46641 transitions. Second operand has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:19,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:57:19,741 INFO L93 Difference]: Finished difference Result 50624 states and 92033 transitions. [2021-11-07 01:57:19,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:57:19,742 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-07 01:57:19,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:57:19,794 INFO L225 Difference]: With dead ends: 50624 [2021-11-07 01:57:19,794 INFO L226 Difference]: Without dead ends: 25194 [2021-11-07 01:57:19,825 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:57:19,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25194 states. [2021-11-07 01:57:20,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25194 to 12980. [2021-11-07 01:57:20,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12980 states, 12974 states have (on average 1.8129335594265454) internal successors, (23521), 12979 states have internal predecessors, (23521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:20,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12980 states to 12980 states and 23521 transitions. [2021-11-07 01:57:20,889 INFO L78 Accepts]: Start accepts. Automaton has 12980 states and 23521 transitions. Word has length 76 [2021-11-07 01:57:20,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:57:20,890 INFO L470 AbstractCegarLoop]: Abstraction has 12980 states and 23521 transitions. [2021-11-07 01:57:20,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:20,890 INFO L276 IsEmpty]: Start isEmpty. Operand 12980 states and 23521 transitions. [2021-11-07 01:57:20,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 01:57:20,902 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:57:20,903 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:57:20,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:57:21,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:57:21,118 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:57:21,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:57:21,119 INFO L85 PathProgramCache]: Analyzing trace with hash -2036313468, now seen corresponding path program 1 times [2021-11-07 01:57:21,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:57:21,120 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [717097995] [2021-11-07 01:57:21,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:21,120 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:57:21,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:57:21,121 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:57:21,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 01:57:22,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:22,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 525 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:57:22,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:22,268 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 01:57:22,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:22,514 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 01:57:22,515 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:57:22,515 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [717097995] [2021-11-07 01:57:22,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [717097995] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:57:22,515 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1860269798] [2021-11-07 01:57:22,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:22,515 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:57:22,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:57:22,517 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:57:22,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 01:57:23,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:23,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 525 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:57:23,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:24,512 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 01:57:24,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:25,058 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 01:57:25,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1860269798] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:57:25,058 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:57:25,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:57:25,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936228577] [2021-11-07 01:57:25,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:57:25,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:57:25,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:57:25,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:57:25,061 INFO L87 Difference]: Start difference. First operand 12980 states and 23521 transitions. Second operand has 16 states, 16 states have (on average 8.125) internal successors, (130), 15 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:42,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:57:42,246 INFO L93 Difference]: Finished difference Result 30070 states and 53891 transitions. [2021-11-07 01:57:42,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-07 01:57:42,247 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.125) internal successors, (130), 15 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-07 01:57:42,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:57:42,291 INFO L225 Difference]: With dead ends: 30070 [2021-11-07 01:57:42,291 INFO L226 Difference]: Without dead ends: 29541 [2021-11-07 01:57:42,297 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 288 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=409, Invalid=1313, Unknown=0, NotChecked=0, Total=1722 [2021-11-07 01:57:42,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29541 states. [2021-11-07 01:57:43,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29541 to 25690. [2021-11-07 01:57:43,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25690 states, 25684 states have (on average 1.8140865908736956) internal successors, (46593), 25689 states have internal predecessors, (46593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:43,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25690 states to 25690 states and 46593 transitions. [2021-11-07 01:57:43,920 INFO L78 Accepts]: Start accepts. Automaton has 25690 states and 46593 transitions. Word has length 78 [2021-11-07 01:57:43,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:57:43,920 INFO L470 AbstractCegarLoop]: Abstraction has 25690 states and 46593 transitions. [2021-11-07 01:57:43,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.125) internal successors, (130), 15 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:43,920 INFO L276 IsEmpty]: Start isEmpty. Operand 25690 states and 46593 transitions. [2021-11-07 01:57:43,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:57:43,935 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:57:43,935 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:57:43,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:57:44,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 01:57:44,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:57:44,342 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:57:44,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:57:44,342 INFO L85 PathProgramCache]: Analyzing trace with hash -1178387332, now seen corresponding path program 1 times [2021-11-07 01:57:44,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:57:44,343 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [574771876] [2021-11-07 01:57:44,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:44,343 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:57:44,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:57:44,344 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:57:44,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 01:57:45,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:45,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:57:45,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:45,493 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 01:57:45,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:45,789 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 01:57:45,789 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:57:45,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [574771876] [2021-11-07 01:57:45,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [574771876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:57:45,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [194653288] [2021-11-07 01:57:45,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:45,790 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:57:45,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:57:45,794 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:57:45,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 01:57:47,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:47,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:57:47,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:47,295 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 01:57:47,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:47,473 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 01:57:47,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [194653288] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:57:47,473 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:57:47,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:57:47,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446253230] [2021-11-07 01:57:47,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:57:47,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:57:47,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:57:47,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:57:47,475 INFO L87 Difference]: Start difference. First operand 25690 states and 46593 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:49,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:57:49,015 INFO L93 Difference]: Finished difference Result 26771 states and 48429 transitions. [2021-11-07 01:57:49,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:57:49,015 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 01:57:49,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:57:49,056 INFO L225 Difference]: With dead ends: 26771 [2021-11-07 01:57:49,056 INFO L226 Difference]: Without dead ends: 26181 [2021-11-07 01:57:49,062 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:57:49,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26181 states. [2021-11-07 01:57:50,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26181 to 25689. [2021-11-07 01:57:50,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25689 states, 25683 states have (on average 1.814001479577931) internal successors, (46589), 25688 states have internal predecessors, (46589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:50,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25689 states to 25689 states and 46589 transitions. [2021-11-07 01:57:50,610 INFO L78 Accepts]: Start accepts. Automaton has 25689 states and 46589 transitions. Word has length 79 [2021-11-07 01:57:50,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:57:50,610 INFO L470 AbstractCegarLoop]: Abstraction has 25689 states and 46589 transitions. [2021-11-07 01:57:50,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:50,611 INFO L276 IsEmpty]: Start isEmpty. Operand 25689 states and 46589 transitions. [2021-11-07 01:57:50,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:57:50,625 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:57:50,626 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:57:50,639 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:57:50,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:57:51,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:57:51,027 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:57:51,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:57:51,027 INFO L85 PathProgramCache]: Analyzing trace with hash 918563238, now seen corresponding path program 1 times [2021-11-07 01:57:51,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:57:51,028 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [522004242] [2021-11-07 01:57:51,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:51,028 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:57:51,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:57:51,029 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:57:51,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 01:57:52,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:52,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:57:52,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:52,263 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 01:57:52,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:52,497 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:57:52,497 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:57:52,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [522004242] [2021-11-07 01:57:52,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [522004242] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:57:52,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [830780980] [2021-11-07 01:57:52,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:57:52,498 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:57:52,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:57:52,503 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:57:52,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 01:57:53,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:53,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:57:53,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:54,186 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 01:57:54,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:57:54,497 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 01:57:54,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [830780980] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:57:54,497 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:57:54,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 14 [2021-11-07 01:57:54,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237067907] [2021-11-07 01:57:54,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:57:54,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:57:54,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:57:54,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-11-07 01:57:54,499 INFO L87 Difference]: Start difference. First operand 25689 states and 46589 transitions. Second operand has 8 states, 8 states have (on average 9.125) internal successors, (73), 8 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:57:58,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:57:58,523 INFO L93 Difference]: Finished difference Result 27123 states and 49012 transitions. [2021-11-07 01:57:58,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 01:57:58,524 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.125) internal successors, (73), 8 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 01:57:58,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:57:58,561 INFO L225 Difference]: With dead ends: 27123 [2021-11-07 01:57:58,561 INFO L226 Difference]: Without dead ends: 26111 [2021-11-07 01:57:58,566 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:57:58,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26111 states. [2021-11-07 01:58:00,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26111 to 25653. [2021-11-07 01:58:00,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25653 states, 25647 states have (on average 1.8133894802511015) internal successors, (46508), 25652 states have internal predecessors, (46508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:58:00,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25653 states to 25653 states and 46508 transitions. [2021-11-07 01:58:00,229 INFO L78 Accepts]: Start accepts. Automaton has 25653 states and 46508 transitions. Word has length 79 [2021-11-07 01:58:00,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:00,229 INFO L470 AbstractCegarLoop]: Abstraction has 25653 states and 46508 transitions. [2021-11-07 01:58:00,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 9.125) internal successors, (73), 8 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:58:00,229 INFO L276 IsEmpty]: Start isEmpty. Operand 25653 states and 46508 transitions. [2021-11-07 01:58:00,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:58:00,243 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:00,243 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:00,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:00,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:00,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:58:00,645 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:58:00,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:00,645 INFO L85 PathProgramCache]: Analyzing trace with hash 478474330, now seen corresponding path program 1 times [2021-11-07 01:58:00,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:58:00,646 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1252215067] [2021-11-07 01:58:00,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:00,646 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:58:00,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:58:00,647 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:58:00,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 01:58:01,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:01,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:58:01,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:02,071 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:58:02,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:02,319 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 01:58:02,319 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:58:02,320 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1252215067] [2021-11-07 01:58:02,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1252215067] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:02,320 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2111058372] [2021-11-07 01:58:02,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:02,320 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:58:02,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:58:02,321 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:58:02,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 01:58:03,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:03,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:58:03,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:04,723 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 01:58:04,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:05,272 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 01:58:05,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2111058372] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:58:05,273 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:58:05,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:58:05,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915639240] [2021-11-07 01:58:05,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:58:05,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:58:05,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:58:05,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:58:05,275 INFO L87 Difference]: Start difference. First operand 25653 states and 46508 transitions. Second operand has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:58:23,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:23,921 INFO L93 Difference]: Finished difference Result 57621 states and 103564 transitions. [2021-11-07 01:58:23,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-07 01:58:23,922 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 01:58:23,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:24,012 INFO L225 Difference]: With dead ends: 57621 [2021-11-07 01:58:24,012 INFO L226 Difference]: Without dead ends: 56645 [2021-11-07 01:58:24,022 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=391, Invalid=1249, Unknown=0, NotChecked=0, Total=1640 [2021-11-07 01:58:24,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56645 states. [2021-11-07 01:58:27,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56645 to 50963. [2021-11-07 01:58:27,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50963 states, 50957 states have (on average 1.8139804148595875) internal successors, (92435), 50962 states have internal predecessors, (92435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:58:27,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50963 states to 50963 states and 92435 transitions. [2021-11-07 01:58:27,203 INFO L78 Accepts]: Start accepts. Automaton has 50963 states and 92435 transitions. Word has length 79 [2021-11-07 01:58:27,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:27,204 INFO L470 AbstractCegarLoop]: Abstraction has 50963 states and 92435 transitions. [2021-11-07 01:58:27,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:58:27,204 INFO L276 IsEmpty]: Start isEmpty. Operand 50963 states and 92435 transitions. [2021-11-07 01:58:27,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:58:27,220 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:27,220 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:27,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:27,425 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:27,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:58:27,621 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:58:27,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:27,622 INFO L85 PathProgramCache]: Analyzing trace with hash -801389348, now seen corresponding path program 1 times [2021-11-07 01:58:27,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:58:27,623 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [84832840] [2021-11-07 01:58:27,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:27,623 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:58:27,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:58:27,625 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:58:27,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 01:58:28,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:28,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:58:28,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:28,926 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 01:58:28,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:29,155 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 01:58:29,155 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:58:29,155 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [84832840] [2021-11-07 01:58:29,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [84832840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:29,155 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1068256366] [2021-11-07 01:58:29,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:29,156 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:58:29,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:58:29,156 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:58:29,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 01:58:30,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:30,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 01:58:30,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:31,026 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 01:58:31,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:31,380 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 01:58:31,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1068256366] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:58:31,380 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:58:31,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 01:58:31,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171672463] [2021-11-07 01:58:31,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:58:31,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:58:31,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:58:31,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:58:31,383 INFO L87 Difference]: Start difference. First operand 50963 states and 92435 transitions. Second operand has 11 states, 11 states have (on average 12.636363636363637) internal successors, (139), 11 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:58:51,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:51,885 INFO L93 Difference]: Finished difference Result 222808 states and 403575 transitions. [2021-11-07 01:58:51,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-07 01:58:51,885 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 12.636363636363637) internal successors, (139), 11 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 01:58:51,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:52,399 INFO L225 Difference]: With dead ends: 222808 [2021-11-07 01:58:52,399 INFO L226 Difference]: Without dead ends: 222780 [2021-11-07 01:58:52,447 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=958, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 01:58:52,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222780 states. [2021-11-07 01:58:57,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222780 to 50995. [2021-11-07 01:58:57,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50995 states, 50989 states have (on average 1.8134303477220577) internal successors, (92465), 50994 states have internal predecessors, (92465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:58:57,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50995 states to 50995 states and 92465 transitions. [2021-11-07 01:58:57,481 INFO L78 Accepts]: Start accepts. Automaton has 50995 states and 92465 transitions. Word has length 79 [2021-11-07 01:58:57,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:57,482 INFO L470 AbstractCegarLoop]: Abstraction has 50995 states and 92465 transitions. [2021-11-07 01:58:57,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 12.636363636363637) internal successors, (139), 11 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:58:57,482 INFO L276 IsEmpty]: Start isEmpty. Operand 50995 states and 92465 transitions. [2021-11-07 01:58:57,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 01:58:57,503 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:57,503 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:57,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:57,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:57,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:58:57,905 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 01:58:57,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:57,905 INFO L85 PathProgramCache]: Analyzing trace with hash 928312641, now seen corresponding path program 1 times [2021-11-07 01:58:57,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:58:57,906 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [185155087] [2021-11-07 01:58:57,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:57,906 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:58:57,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:58:57,907 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:58:57,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:58:59,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:59,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:58:59,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:59,359 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 01:58:59,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:59,601 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 01:58:59,601 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:58:59,602 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [185155087] [2021-11-07 01:58:59,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [185155087] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:59,602 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2093355614] [2021-11-07 01:58:59,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:59,602 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:58:59,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:58:59,608 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:58:59,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4cc7d4c7-3d96-45fc-bcc7-937b8b40ceca/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:59:01,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:01,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-07 01:59:01,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:59:01,753 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:59:01,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:59:02,049 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 01:59:02,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2093355614] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:59:02,049 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:59:02,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [5, 5] total 16 [2021-11-07 01:59:02,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721207781] [2021-11-07 01:59:02,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:59:02,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:59:02,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:59:02,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:59:02,051 INFO L87 Difference]: Start difference. First operand 50995 states and 92465 transitions. Second operand has 10 states, 10 states have (on average 7.4) internal successors, (74), 10 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)