./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec0_product19.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_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/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_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec0_product19.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/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_3a387fc1-485e-4917-accd-edbf6e2a196c/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 9deea958caebdff7c89a17deb67516eff149386872824a7682accca78686b765 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:59:42,355 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:59:42,357 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:59:42,396 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:59:42,397 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:59:42,401 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:59:42,404 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:59:42,408 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:59:42,410 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:59:42,416 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:59:42,417 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:59:42,419 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:59:42,419 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:59:42,422 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:59:42,425 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:59:42,429 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:59:42,431 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:59:42,432 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:59:42,436 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:59:42,444 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:59:42,446 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:59:42,448 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:59:42,451 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:59:42,452 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:59:42,461 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:59:42,462 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:59:42,462 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:59:42,464 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:59:42,465 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:59:42,466 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:59:42,467 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:59:42,468 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:59:42,470 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:59:42,471 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:59:42,473 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:59:42,473 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:59:42,474 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:59:42,474 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:59:42,475 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:59:42,476 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:59:42,476 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:59:42,477 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:59:42,525 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:59:42,525 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:59:42,526 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:59:42,527 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:59:42,527 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:59:42,527 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:59:42,527 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:59:42,528 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:59:42,528 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:59:42,528 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:59:42,528 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:59:42,529 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:59:42,529 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:59:42,529 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:59:42,529 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:59:42,530 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:59:42,530 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:59:42,531 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:59:42,531 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:59:42,531 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:59:42,531 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:59:42,532 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:59:42,532 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:59:42,532 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:59:42,532 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:59:42,533 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:59:42,533 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:59:42,533 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:59:42,533 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:59:42,534 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:59:42,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:59:42,534 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:59:42,534 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:59:42,535 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:59:42,535 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:59:42,535 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:59:42,535 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:59:42,536 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:59:42,536 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:59:42,536 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_3a387fc1-485e-4917-accd-edbf6e2a196c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9deea958caebdff7c89a17deb67516eff149386872824a7682accca78686b765 [2021-11-07 00:59:42,771 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:59:42,793 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:59:42,796 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:59:42,797 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:59:42,798 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:59:42,799 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec0_product19.cil.c [2021-11-07 00:59:42,869 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data/f1751c3d8/a391f95f12304ef0a34492ff6bf9de1a/FLAG71ce055ca [2021-11-07 00:59:43,525 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:59:43,525 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/sv-benchmarks/c/product-lines/email_spec0_product19.cil.c [2021-11-07 00:59:43,546 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data/f1751c3d8/a391f95f12304ef0a34492ff6bf9de1a/FLAG71ce055ca [2021-11-07 00:59:43,877 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data/f1751c3d8/a391f95f12304ef0a34492ff6bf9de1a [2021-11-07 00:59:43,879 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:59:43,880 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:59:43,882 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:59:43,882 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:59:43,885 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:59:43,886 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:59:43" (1/1) ... [2021-11-07 00:59:43,887 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@613079fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:43, skipping insertion in model container [2021-11-07 00:59:43,888 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:59:43" (1/1) ... [2021-11-07 00:59:43,894 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:59:43,962 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:59:44,444 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_3a387fc1-485e-4917-accd-edbf6e2a196c/sv-benchmarks/c/product-lines/email_spec0_product19.cil.c[39319,39332] [2021-11-07 00:59:44,598 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:59:44,617 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 00:59:44,621 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@588b4e75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:44, skipping insertion in model container [2021-11-07 00:59:44,622 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:59:44,622 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 00:59:44,625 INFO L168 Benchmark]: Toolchain (without parser) took 742.91 ms. Allocated memory was 121.6 MB in the beginning and 167.8 MB in the end (delta: 46.1 MB). Free memory was 92.5 MB in the beginning and 128.2 MB in the end (delta: -35.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-07 00:59:44,628 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 121.6 MB. Free memory is still 79.9 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 00:59:44,630 INFO L168 Benchmark]: CACSL2BoogieTranslator took 740.50 ms. Allocated memory was 121.6 MB in the beginning and 167.8 MB in the end (delta: 46.1 MB). Free memory was 92.2 MB in the beginning and 128.2 MB in the end (delta: -36.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-07 00:59:44,632 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 121.6 MB. Free memory is still 79.9 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 740.50 ms. Allocated memory was 121.6 MB in the beginning and 167.8 MB in the end (delta: 46.1 MB). Free memory was 92.2 MB in the beginning and 128.2 MB in the end (delta: -36.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 2154]: 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_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/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_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec0_product19.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/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_3a387fc1-485e-4917-accd-edbf6e2a196c/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 9deea958caebdff7c89a17deb67516eff149386872824a7682accca78686b765 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:59:46,815 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:59:46,818 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:59:46,869 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:59:46,870 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:59:46,874 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:59:46,876 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:59:46,881 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:59:46,884 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:59:46,891 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:59:46,893 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:59:46,895 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:59:46,895 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:59:46,898 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:59:46,899 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:59:46,904 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:59:46,905 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:59:46,907 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:59:46,909 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:59:46,922 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:59:46,924 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:59:46,925 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:59:46,928 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:59:46,930 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:59:46,940 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:59:46,940 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:59:46,941 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:59:46,942 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:59:46,943 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:59:46,944 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:59:46,944 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:59:46,945 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:59:46,947 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:59:46,948 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:59:46,950 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:59:46,950 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:59:46,951 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:59:46,951 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:59:46,951 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:59:46,953 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:59:46,954 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:59:46,955 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 00:59:46,991 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:59:46,991 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:59:46,992 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:59:46,993 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:59:46,993 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:59:46,993 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:59:46,993 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:59:46,994 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:59:46,994 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:59:46,995 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:59:46,995 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:59:46,995 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:59:46,995 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:59:46,996 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:59:46,996 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:59:46,996 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:59:46,996 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:59:46,997 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 00:59:46,997 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 00:59:46,997 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:59:46,997 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:59:46,997 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:59:46,998 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:59:46,998 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:59:46,998 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 00:59:46,998 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:59:46,999 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:59:46,999 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:59:46,999 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:59:46,999 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:59:47,000 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 00:59:47,000 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:47,000 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:59:47,000 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:59:47,001 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:59:47,001 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_3a387fc1-485e-4917-accd-edbf6e2a196c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9deea958caebdff7c89a17deb67516eff149386872824a7682accca78686b765 [2021-11-07 00:59:47,351 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:59:47,380 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:59:47,383 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:59:47,384 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:59:47,385 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:59:47,386 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec0_product19.cil.c [2021-11-07 00:59:47,465 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data/1b7b6e836/0c84bea453e94ded9ca6f64e2005fb93/FLAG0849d1f29 [2021-11-07 00:59:48,091 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:59:48,092 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/sv-benchmarks/c/product-lines/email_spec0_product19.cil.c [2021-11-07 00:59:48,118 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data/1b7b6e836/0c84bea453e94ded9ca6f64e2005fb93/FLAG0849d1f29 [2021-11-07 00:59:48,310 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/data/1b7b6e836/0c84bea453e94ded9ca6f64e2005fb93 [2021-11-07 00:59:48,317 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:59:48,319 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:59:48,322 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:59:48,323 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:59:48,327 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:59:48,327 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:59:48" (1/1) ... [2021-11-07 00:59:48,329 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ae5595b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:48, skipping insertion in model container [2021-11-07 00:59:48,329 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:59:48" (1/1) ... [2021-11-07 00:59:48,337 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:59:48,423 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:59:49,011 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_3a387fc1-485e-4917-accd-edbf6e2a196c/sv-benchmarks/c/product-lines/email_spec0_product19.cil.c[39319,39332] [2021-11-07 00:59:49,081 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:59:49,095 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 00:59:49,115 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:59:49,228 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_3a387fc1-485e-4917-accd-edbf6e2a196c/sv-benchmarks/c/product-lines/email_spec0_product19.cil.c[39319,39332] [2021-11-07 00:59:49,257 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:59:49,263 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:59:49,349 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_3a387fc1-485e-4917-accd-edbf6e2a196c/sv-benchmarks/c/product-lines/email_spec0_product19.cil.c[39319,39332] [2021-11-07 00:59:49,422 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:59:49,472 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:59:49,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49 WrapperNode [2021-11-07 00:59:49,472 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:59:49,473 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:59:49,474 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:59:49,474 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:59:49,481 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,522 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,619 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:59:49,620 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:59:49,620 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:59:49,620 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:59:49,629 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,629 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,640 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,641 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,713 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,765 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,772 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,798 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:59:49,798 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:59:49,799 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:59:49,799 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:59:49,800 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (1/1) ... [2021-11-07 00:59:49,808 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:59:49,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:59:49,836 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:59:49,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:59:49,908 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 00:59:49,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:59:49,908 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 00:59:49,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:59:49,909 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:59:54,283 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:59:54,289 INFO L299 CfgBuilder]: Removed 295 assume(true) statements. [2021-11-07 00:59:54,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:59:54 BoogieIcfgContainer [2021-11-07 00:59:54,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:59:54,300 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:59:54,301 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:59:54,304 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:59:54,304 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:59:48" (1/3) ... [2021-11-07 00:59:54,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e39ef20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:59:54, skipping insertion in model container [2021-11-07 00:59:54,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:59:49" (2/3) ... [2021-11-07 00:59:54,306 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e39ef20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:59:54, skipping insertion in model container [2021-11-07 00:59:54,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:59:54" (3/3) ... [2021-11-07 00:59:54,307 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec0_product19.cil.c [2021-11-07 00:59:54,315 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:59:54,315 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 00:59:54,363 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:59:54,373 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 00:59:54,374 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 00:59:54,411 INFO L276 IsEmpty]: Start isEmpty. Operand has 435 states, 432 states have (on average 1.7407407407407407) internal successors, (752), 434 states have internal predecessors, (752), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:54,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 00:59:54,424 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:54,425 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] [2021-11-07 00:59:54,425 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:54,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:54,430 INFO L85 PathProgramCache]: Analyzing trace with hash -1864457489, now seen corresponding path program 1 times [2021-11-07 00:59:54,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:54,443 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1738276252] [2021-11-07 00:59:54,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:54,444 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:54,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:54,445 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:54,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 00:59:54,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:54,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 00:59:54,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:55,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:55,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:55,178 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:55,178 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:55,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1738276252] [2021-11-07 00:59:55,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1738276252] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:55,179 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:55,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 00:59:55,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553229958] [2021-11-07 00:59:55,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 00:59:55,186 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:55,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 00:59:55,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:59:55,203 INFO L87 Difference]: Start difference. First operand has 435 states, 432 states have (on average 1.7407407407407407) internal successors, (752), 434 states have internal predecessors, (752), 0 states have call successors, (0), 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 23.5) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:55,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:55,261 INFO L93 Difference]: Finished difference Result 628 states and 1063 transitions. [2021-11-07 00:59:55,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 00:59:55,262 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 23.5) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-07 00:59:55,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:55,279 INFO L225 Difference]: With dead ends: 628 [2021-11-07 00:59:55,279 INFO L226 Difference]: Without dead ends: 408 [2021-11-07 00:59:55,283 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:59:55,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2021-11-07 00:59:55,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 408. [2021-11-07 00:59:55,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 408 states, 406 states have (on average 1.7389162561576355) internal successors, (706), 407 states have internal predecessors, (706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:55,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 706 transitions. [2021-11-07 00:59:55,367 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 706 transitions. Word has length 47 [2021-11-07 00:59:55,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:55,373 INFO L470 AbstractCegarLoop]: Abstraction has 408 states and 706 transitions. [2021-11-07 00:59:55,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 23.5) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:55,374 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 706 transitions. [2021-11-07 00:59:55,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 00:59:55,382 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:55,383 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:55,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:55,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:55,591 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:55,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:55,592 INFO L85 PathProgramCache]: Analyzing trace with hash -1771921630, now seen corresponding path program 1 times [2021-11-07 00:59:55,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:55,593 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1211840904] [2021-11-07 00:59:55,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:55,594 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:55,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:55,595 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:55,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 00:59:55,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:55,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:59:55,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:56,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:56,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:56,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:56,370 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:56,370 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1211840904] [2021-11-07 00:59:56,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1211840904] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:56,371 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:56,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:59:56,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779326885] [2021-11-07 00:59:56,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:59:56,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:56,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:59:56,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:59:56,380 INFO L87 Difference]: Start difference. First operand 408 states and 706 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 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 00:59:56,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:56,529 INFO L93 Difference]: Finished difference Result 1194 states and 2070 transitions. [2021-11-07 00:59:56,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:59:56,530 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 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 48 [2021-11-07 00:59:56,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:56,544 INFO L225 Difference]: With dead ends: 1194 [2021-11-07 00:59:56,544 INFO L226 Difference]: Without dead ends: 801 [2021-11-07 00:59:56,550 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:59:56,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 801 states. [2021-11-07 00:59:56,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 801 to 407. [2021-11-07 00:59:56,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 405 states have (on average 1.7308641975308643) internal successors, (701), 406 states have internal predecessors, (701), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:56,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 701 transitions. [2021-11-07 00:59:56,611 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 701 transitions. Word has length 48 [2021-11-07 00:59:56,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:56,611 INFO L470 AbstractCegarLoop]: Abstraction has 407 states and 701 transitions. [2021-11-07 00:59:56,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 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 00:59:56,612 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 701 transitions. [2021-11-07 00:59:56,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 00:59:56,615 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:56,615 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 00:59:56,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:56,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:56,831 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:56,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:56,831 INFO L85 PathProgramCache]: Analyzing trace with hash 81983228, now seen corresponding path program 1 times [2021-11-07 00:59:56,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:56,833 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [459463522] [2021-11-07 00:59:56,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:56,833 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:56,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:56,835 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:56,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 00:59:57,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:57,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:59:57,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:57,397 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:57,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:57,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:57,547 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:57,548 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [459463522] [2021-11-07 00:59:57,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [459463522] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:57,548 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:57,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:59:57,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828100665] [2021-11-07 00:59:57,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:59:57,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:57,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:59:57,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:59:57,554 INFO L87 Difference]: Start difference. First operand 407 states and 701 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:57,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:57,793 INFO L93 Difference]: Finished difference Result 1545 states and 2666 transitions. [2021-11-07 00:59:57,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:59:57,794 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 0 states have call successors, (0), 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 00:59:57,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:57,805 INFO L225 Difference]: With dead ends: 1545 [2021-11-07 00:59:57,805 INFO L226 Difference]: Without dead ends: 1156 [2021-11-07 00:59:57,807 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:59:57,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1156 states. [2021-11-07 00:59:57,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1156 to 406. [2021-11-07 00:59:57,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 404 states have (on average 1.7252475247524752) internal successors, (697), 405 states have internal predecessors, (697), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:57,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 697 transitions. [2021-11-07 00:59:57,866 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 697 transitions. Word has length 50 [2021-11-07 00:59:57,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:57,866 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 697 transitions. [2021-11-07 00:59:57,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:57,867 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 697 transitions. [2021-11-07 00:59:57,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 00:59:57,871 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:57,872 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 00:59:57,890 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-11-07 00:59:58,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:58,087 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:58,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:58,088 INFO L85 PathProgramCache]: Analyzing trace with hash 1966671113, now seen corresponding path program 1 times [2021-11-07 00:59:58,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:58,089 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [90110597] [2021-11-07 00:59:58,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:58,090 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:58,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:58,091 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:58,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 00:59:58,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:58,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:59:58,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:58,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:58,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:58,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:58,779 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:58,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [90110597] [2021-11-07 00:59:58,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [90110597] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:58,780 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:58,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:59:58,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415070163] [2021-11-07 00:59:58,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:59:58,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:58,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:59:58,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:59:58,783 INFO L87 Difference]: Start difference. First operand 406 states and 697 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:58,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:58,864 INFO L93 Difference]: Finished difference Result 809 states and 1391 transitions. [2021-11-07 00:59:58,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:59:58,865 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 00:59:58,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:58,868 INFO L225 Difference]: With dead ends: 809 [2021-11-07 00:59:58,868 INFO L226 Difference]: Without dead ends: 411 [2021-11-07 00:59:58,869 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 00:59:58,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2021-11-07 00:59:58,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 406. [2021-11-07 00:59:58,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 404 states have (on average 1.7178217821782178) internal successors, (694), 405 states have internal predecessors, (694), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:58,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 694 transitions. [2021-11-07 00:59:58,899 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 694 transitions. Word has length 51 [2021-11-07 00:59:58,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:58,899 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 694 transitions. [2021-11-07 00:59:58,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:58,901 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 694 transitions. [2021-11-07 00:59:58,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 00:59:58,902 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:58,902 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] [2021-11-07 00:59:58,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:59,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:59,117 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:59,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:59,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1441693460, now seen corresponding path program 1 times [2021-11-07 00:59:59,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:59,118 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1097419086] [2021-11-07 00:59:59,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:59,118 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:59,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:59,119 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:59,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 00:59:59,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:59,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:59:59,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:59,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:59,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:59,883 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:59,887 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:59,887 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1097419086] [2021-11-07 00:59:59,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1097419086] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:59,887 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:59:59,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:59:59,888 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615107754] [2021-11-07 00:59:59,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:59:59,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:59,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:59:59,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:59:59,889 INFO L87 Difference]: Start difference. First operand 406 states and 694 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 01:00:00,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:00,135 INFO L93 Difference]: Finished difference Result 1532 states and 2642 transitions. [2021-11-07 01:00:00,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:00:00,135 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 52 [2021-11-07 01:00:00,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:00,145 INFO L225 Difference]: With dead ends: 1532 [2021-11-07 01:00:00,145 INFO L226 Difference]: Without dead ends: 1152 [2021-11-07 01:00:00,146 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 98 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 01:00:00,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1152 states. [2021-11-07 01:00:00,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1152 to 406. [2021-11-07 01:00:00,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 404 states have (on average 1.7103960396039604) internal successors, (691), 405 states have internal predecessors, (691), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:00,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 691 transitions. [2021-11-07 01:00:00,184 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 691 transitions. Word has length 52 [2021-11-07 01:00:00,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:00,184 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 691 transitions. [2021-11-07 01:00:00,185 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 01:00:00,185 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 691 transitions. [2021-11-07 01:00:00,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 01:00:00,187 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:00,187 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 01:00:00,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:00,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:00,402 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:00,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:00,402 INFO L85 PathProgramCache]: Analyzing trace with hash 2010112697, now seen corresponding path program 1 times [2021-11-07 01:00:00,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:00,403 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1294246983] [2021-11-07 01:00:00,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:00,403 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:00,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:00,404 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:00,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 01:00:00,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:00,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:00:00,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:01,020 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 01:00:01,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:01,150 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 01:00:01,150 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:01,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1294246983] [2021-11-07 01:00:01,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1294246983] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:01,151 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:01,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:00:01,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485407335] [2021-11-07 01:00:01,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:00:01,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:01,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:00:01,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:00:01,153 INFO L87 Difference]: Start difference. First operand 406 states and 691 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 01:00:01,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:01,235 INFO L93 Difference]: Finished difference Result 952 states and 1620 transitions. [2021-11-07 01:00:01,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:00:01,236 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 01:00:01,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:01,241 INFO L225 Difference]: With dead ends: 952 [2021-11-07 01:00:01,242 INFO L226 Difference]: Without dead ends: 786 [2021-11-07 01:00:01,242 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 01:00:01,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 786 states. [2021-11-07 01:00:01,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 786 to 620. [2021-11-07 01:00:01,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 620 states, 618 states have (on average 1.750809061488673) internal successors, (1082), 619 states have internal predecessors, (1082), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:01,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 620 states to 620 states and 1082 transitions. [2021-11-07 01:00:01,293 INFO L78 Accepts]: Start accepts. Automaton has 620 states and 1082 transitions. Word has length 54 [2021-11-07 01:00:01,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:01,293 INFO L470 AbstractCegarLoop]: Abstraction has 620 states and 1082 transitions. [2021-11-07 01:00:01,294 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 01:00:01,294 INFO L276 IsEmpty]: Start isEmpty. Operand 620 states and 1082 transitions. [2021-11-07 01:00:01,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 01:00:01,296 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:01,296 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] [2021-11-07 01:00:01,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:01,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:01,511 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:01,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:01,511 INFO L85 PathProgramCache]: Analyzing trace with hash 359870536, now seen corresponding path program 1 times [2021-11-07 01:00:01,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:01,512 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1368960769] [2021-11-07 01:00:01,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:01,512 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:01,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:01,513 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:01,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 01:00:01,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:01,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:00:01,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:02,120 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 01:00:02,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:02,273 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 01:00:02,273 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:02,273 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1368960769] [2021-11-07 01:00:02,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1368960769] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:02,274 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:02,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:00:02,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565837975] [2021-11-07 01:00:02,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:02,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:02,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:02,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:02,275 INFO L87 Difference]: Start difference. First operand 620 states and 1082 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:02,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:02,360 INFO L93 Difference]: Finished difference Result 1484 states and 2594 transitions. [2021-11-07 01:00:02,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:02,361 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 01:00:02,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:02,367 INFO L225 Difference]: With dead ends: 1484 [2021-11-07 01:00:02,367 INFO L226 Difference]: Without dead ends: 948 [2021-11-07 01:00:02,369 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 129 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 01:00:02,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 948 states. [2021-11-07 01:00:02,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 948 to 782. [2021-11-07 01:00:02,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 782 states, 780 states have (on average 1.764102564102564) internal successors, (1376), 781 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:02,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 782 states to 782 states and 1376 transitions. [2021-11-07 01:00:02,451 INFO L78 Accepts]: Start accepts. Automaton has 782 states and 1376 transitions. Word has length 66 [2021-11-07 01:00:02,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:02,452 INFO L470 AbstractCegarLoop]: Abstraction has 782 states and 1376 transitions. [2021-11-07 01:00:02,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:02,452 INFO L276 IsEmpty]: Start isEmpty. Operand 782 states and 1376 transitions. [2021-11-07 01:00:02,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 01:00:02,454 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:02,454 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] [2021-11-07 01:00:02,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:02,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:02,671 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:02,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:02,671 INFO L85 PathProgramCache]: Analyzing trace with hash 723162121, now seen corresponding path program 1 times [2021-11-07 01:00:02,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:02,672 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1491026164] [2021-11-07 01:00:02,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:02,673 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:02,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:02,674 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:02,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:00:03,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:03,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:00:03,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:03,335 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 01:00:03,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:03,498 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 01:00:03,498 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:03,498 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1491026164] [2021-11-07 01:00:03,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1491026164] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:03,498 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:03,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:00:03,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024234069] [2021-11-07 01:00:03,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:03,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:03,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:03,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:03,501 INFO L87 Difference]: Start difference. First operand 782 states and 1376 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:03,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:03,628 INFO L93 Difference]: Finished difference Result 2014 states and 3562 transitions. [2021-11-07 01:00:03,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:03,629 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-07 01:00:03,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:03,638 INFO L225 Difference]: With dead ends: 2014 [2021-11-07 01:00:03,639 INFO L226 Difference]: Without dead ends: 1320 [2021-11-07 01:00:03,641 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 131 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 01:00:03,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-11-07 01:00:03,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 1154. [2021-11-07 01:00:03,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1154 states, 1152 states have (on average 1.7829861111111112) internal successors, (2054), 1153 states have internal predecessors, (2054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:03,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1154 states to 1154 states and 2054 transitions. [2021-11-07 01:00:03,740 INFO L78 Accepts]: Start accepts. Automaton has 1154 states and 2054 transitions. Word has length 67 [2021-11-07 01:00:03,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:03,741 INFO L470 AbstractCegarLoop]: Abstraction has 1154 states and 2054 transitions. [2021-11-07 01:00:03,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:03,741 INFO L276 IsEmpty]: Start isEmpty. Operand 1154 states and 2054 transitions. [2021-11-07 01:00:03,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:00:03,744 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:03,744 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] [2021-11-07 01:00:03,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:03,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:03,960 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:03,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:03,961 INFO L85 PathProgramCache]: Analyzing trace with hash 35025241, now seen corresponding path program 1 times [2021-11-07 01:00:03,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:03,961 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1139205354] [2021-11-07 01:00:03,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:03,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:03,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:03,963 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:04,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 01:00:04,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:04,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:00:04,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:04,657 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 01:00:04,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:04,812 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 01:00:04,812 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:04,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1139205354] [2021-11-07 01:00:04,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1139205354] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:04,813 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:04,813 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:00:04,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678457449] [2021-11-07 01:00:04,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:00:04,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:04,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:00:04,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:00:04,815 INFO L87 Difference]: Start difference. First operand 1154 states and 2054 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:04,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:04,941 INFO L93 Difference]: Finished difference Result 2228 states and 3950 transitions. [2021-11-07 01:00:04,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:04,942 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 01:00:04,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:04,951 INFO L225 Difference]: With dead ends: 2228 [2021-11-07 01:00:04,951 INFO L226 Difference]: Without dead ends: 1320 [2021-11-07 01:00:04,955 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 132 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 01:00:04,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-11-07 01:00:05,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 1154. [2021-11-07 01:00:05,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1154 states, 1152 states have (on average 1.78125) internal successors, (2052), 1153 states have internal predecessors, (2052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:05,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1154 states to 1154 states and 2052 transitions. [2021-11-07 01:00:05,047 INFO L78 Accepts]: Start accepts. Automaton has 1154 states and 2052 transitions. Word has length 68 [2021-11-07 01:00:05,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:05,047 INFO L470 AbstractCegarLoop]: Abstraction has 1154 states and 2052 transitions. [2021-11-07 01:00:05,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:05,048 INFO L276 IsEmpty]: Start isEmpty. Operand 1154 states and 2052 transitions. [2021-11-07 01:00:05,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:00:05,053 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:05,053 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] [2021-11-07 01:00:05,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:05,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:05,267 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:05,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:05,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1972376230, now seen corresponding path program 1 times [2021-11-07 01:00:05,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:05,268 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1125360579] [2021-11-07 01:00:05,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:05,269 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:05,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:05,270 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:05,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 01:00:05,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:05,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:00:05,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:05,934 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 01:00:05,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:06,091 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 01:00:06,092 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:06,092 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1125360579] [2021-11-07 01:00:06,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1125360579] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:06,092 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:06,092 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:00:06,092 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558104347] [2021-11-07 01:00:06,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:06,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:06,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:06,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:06,094 INFO L87 Difference]: Start difference. First operand 1154 states and 2052 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:06,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:06,255 INFO L93 Difference]: Finished difference Result 3102 states and 5545 transitions. [2021-11-07 01:00:06,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:06,256 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 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 68 [2021-11-07 01:00:06,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:06,269 INFO L225 Difference]: With dead ends: 3102 [2021-11-07 01:00:06,269 INFO L226 Difference]: Without dead ends: 2044 [2021-11-07 01:00:06,271 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 133 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 01:00:06,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2044 states. [2021-11-07 01:00:06,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2044 to 1878. [2021-11-07 01:00:06,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1878 states, 1876 states have (on average 1.796908315565032) internal successors, (3371), 1877 states have internal predecessors, (3371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:06,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1878 states to 1878 states and 3371 transitions. [2021-11-07 01:00:06,435 INFO L78 Accepts]: Start accepts. Automaton has 1878 states and 3371 transitions. Word has length 68 [2021-11-07 01:00:06,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:06,435 INFO L470 AbstractCegarLoop]: Abstraction has 1878 states and 3371 transitions. [2021-11-07 01:00:06,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:06,436 INFO L276 IsEmpty]: Start isEmpty. Operand 1878 states and 3371 transitions. [2021-11-07 01:00:06,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:00:06,443 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:06,443 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 01:00:06,462 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:06,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:06,658 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:06,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:06,658 INFO L85 PathProgramCache]: Analyzing trace with hash -870824441, now seen corresponding path program 1 times [2021-11-07 01:00:06,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:06,659 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1870322685] [2021-11-07 01:00:06,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:06,659 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:06,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:06,660 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:06,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 01:00:07,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:07,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 496 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:00:07,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:07,287 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 01:00:07,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:07,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:07,425 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:07,425 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1870322685] [2021-11-07 01:00:07,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1870322685] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:07,425 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:07,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:00:07,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089692007] [2021-11-07 01:00:07,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:07,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:07,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:07,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:07,427 INFO L87 Difference]: Start difference. First operand 1878 states and 3371 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 01:00:07,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:07,662 INFO L93 Difference]: Finished difference Result 5010 states and 9021 transitions. [2021-11-07 01:00:07,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:07,662 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 01:00:07,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:07,685 INFO L225 Difference]: With dead ends: 5010 [2021-11-07 01:00:07,685 INFO L226 Difference]: Without dead ends: 3262 [2021-11-07 01:00:07,688 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 01:00:07,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3262 states. [2021-11-07 01:00:07,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3262 to 3096. [2021-11-07 01:00:07,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3096 states, 3094 states have (on average 1.8047834518422754) internal successors, (5584), 3095 states have internal predecessors, (5584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:07,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3096 states to 3096 states and 5584 transitions. [2021-11-07 01:00:07,937 INFO L78 Accepts]: Start accepts. Automaton has 3096 states and 5584 transitions. Word has length 69 [2021-11-07 01:00:07,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:07,939 INFO L470 AbstractCegarLoop]: Abstraction has 3096 states and 5584 transitions. [2021-11-07 01:00:07,939 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 01:00:07,939 INFO L276 IsEmpty]: Start isEmpty. Operand 3096 states and 5584 transitions. [2021-11-07 01:00:07,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 01:00:07,944 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:07,944 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 01:00:07,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:08,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:08,159 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:08,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:08,160 INFO L85 PathProgramCache]: Analyzing trace with hash 806004521, now seen corresponding path program 1 times [2021-11-07 01:00:08,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:08,161 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [18551821] [2021-11-07 01:00:08,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:08,161 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:08,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:08,162 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:08,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 01:00:08,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:08,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:00:08,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:08,841 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 01:00:08,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:09,000 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 01:00:09,000 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:09,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [18551821] [2021-11-07 01:00:09,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [18551821] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:09,001 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:09,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:00:09,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403246186] [2021-11-07 01:00:09,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:09,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:09,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:09,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:09,002 INFO L87 Difference]: Start difference. First operand 3096 states and 5584 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 01:00:09,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:09,375 INFO L93 Difference]: Finished difference Result 8380 states and 15143 transitions. [2021-11-07 01:00:09,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:09,376 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 01:00:09,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:09,412 INFO L225 Difference]: With dead ends: 8380 [2021-11-07 01:00:09,413 INFO L226 Difference]: Without dead ends: 5448 [2021-11-07 01:00:09,417 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 01:00:09,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5448 states. [2021-11-07 01:00:09,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5448 to 5282. [2021-11-07 01:00:09,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5282 states, 5280 states have (on average 1.8077651515151516) internal successors, (9545), 5281 states have internal predecessors, (9545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:09,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5282 states to 5282 states and 9545 transitions. [2021-11-07 01:00:09,817 INFO L78 Accepts]: Start accepts. Automaton has 5282 states and 9545 transitions. Word has length 70 [2021-11-07 01:00:09,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:09,817 INFO L470 AbstractCegarLoop]: Abstraction has 5282 states and 9545 transitions. [2021-11-07 01:00:09,817 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 01:00:09,818 INFO L276 IsEmpty]: Start isEmpty. Operand 5282 states and 9545 transitions. [2021-11-07 01:00:09,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:00:09,826 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:09,826 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] [2021-11-07 01:00:09,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:10,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:10,042 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:10,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:10,043 INFO L85 PathProgramCache]: Analyzing trace with hash 420766597, now seen corresponding path program 1 times [2021-11-07 01:00:10,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:10,043 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1233490249] [2021-11-07 01:00:10,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:10,044 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:10,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:10,047 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:10,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 01:00:10,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:10,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:10,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:10,813 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 01:00:10,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:11,027 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 01:00:11,027 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:11,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1233490249] [2021-11-07 01:00:11,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1233490249] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:11,028 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:11,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:00:11,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241806811] [2021-11-07 01:00:11,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:00:11,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:11,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:00:11,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:00:11,031 INFO L87 Difference]: Start difference. First operand 5282 states and 9545 transitions. Second operand has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:14,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:14,218 INFO L93 Difference]: Finished difference Result 19768 states and 35761 transitions. [2021-11-07 01:00:14,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:00:14,219 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 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 01:00:14,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:14,280 INFO L225 Difference]: With dead ends: 19768 [2021-11-07 01:00:14,280 INFO L226 Difference]: Without dead ends: 14730 [2021-11-07 01:00:14,290 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 136 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 01:00:14,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14730 states. [2021-11-07 01:00:14,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14730 to 5232. [2021-11-07 01:00:14,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5232 states, 5230 states have (on average 1.7868068833652007) internal successors, (9345), 5231 states have internal predecessors, (9345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:14,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5232 states to 5232 states and 9345 transitions. [2021-11-07 01:00:14,856 INFO L78 Accepts]: Start accepts. Automaton has 5232 states and 9345 transitions. Word has length 71 [2021-11-07 01:00:14,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:14,857 INFO L470 AbstractCegarLoop]: Abstraction has 5232 states and 9345 transitions. [2021-11-07 01:00:14,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:14,858 INFO L276 IsEmpty]: Start isEmpty. Operand 5232 states and 9345 transitions. [2021-11-07 01:00:14,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:00:14,864 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:14,864 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 01:00:14,880 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-11-07 01:00:15,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:15,079 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:15,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:15,080 INFO L85 PathProgramCache]: Analyzing trace with hash 48373174, now seen corresponding path program 1 times [2021-11-07 01:00:15,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:15,080 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1635970641] [2021-11-07 01:00:15,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:15,081 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:15,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:15,081 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:15,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:00:15,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:15,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:00:15,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:16,109 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 01:00:16,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:16,294 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 01:00:16,295 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:16,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1635970641] [2021-11-07 01:00:16,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1635970641] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:16,295 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:16,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:00:16,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258472528] [2021-11-07 01:00:16,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:00:16,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:16,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:00:16,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:00:16,297 INFO L87 Difference]: Start difference. First operand 5232 states and 9345 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 01:00:16,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:16,875 INFO L93 Difference]: Finished difference Result 15117 states and 27049 transitions. [2021-11-07 01:00:16,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:00:16,875 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 01:00:16,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:16,897 INFO L225 Difference]: With dead ends: 15117 [2021-11-07 01:00:16,897 INFO L226 Difference]: Without dead ends: 10056 [2021-11-07 01:00:16,905 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 01:00:16,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10056 states. [2021-11-07 01:00:17,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10056 to 9890. [2021-11-07 01:00:17,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9890 states, 9888 states have (on average 1.7882281553398058) internal successors, (17682), 9889 states have internal predecessors, (17682), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:17,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9890 states to 9890 states and 17682 transitions. [2021-11-07 01:00:17,509 INFO L78 Accepts]: Start accepts. Automaton has 9890 states and 17682 transitions. Word has length 71 [2021-11-07 01:00:17,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:17,509 INFO L470 AbstractCegarLoop]: Abstraction has 9890 states and 17682 transitions. [2021-11-07 01:00:17,510 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 01:00:17,510 INFO L276 IsEmpty]: Start isEmpty. Operand 9890 states and 17682 transitions. [2021-11-07 01:00:17,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:00:17,517 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:17,517 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] [2021-11-07 01:00:17,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:17,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:17,733 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:17,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:17,733 INFO L85 PathProgramCache]: Analyzing trace with hash 1932304682, now seen corresponding path program 1 times [2021-11-07 01:00:17,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:17,734 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1151075539] [2021-11-07 01:00:17,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:17,734 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:17,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:17,735 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:17,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 01:00:18,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:18,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:18,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:18,523 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:18,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:18,740 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:18,740 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:18,740 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1151075539] [2021-11-07 01:00:18,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1151075539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:18,740 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1926754232] [2021-11-07 01:00:18,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:18,741 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:18,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:18,749 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:18,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 01:00:19,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:19,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:00:19,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:19,882 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:19,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:20,168 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:20,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1926754232] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:20,169 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:20,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 01:00:20,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537026426] [2021-11-07 01:00:20,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:00:20,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:20,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:00:20,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:00:20,172 INFO L87 Difference]: Start difference. First operand 9890 states and 17682 transitions. Second operand has 10 states, 10 states have (on average 10.7) internal successors, (107), 10 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:25,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:25,357 INFO L93 Difference]: Finished difference Result 58275 states and 104716 transitions. [2021-11-07 01:00:25,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-07 01:00:25,358 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 10.7) internal successors, (107), 10 states have internal predecessors, (107), 0 states have call successors, (0), 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 01:00:25,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:25,509 INFO L225 Difference]: With dead ends: 58275 [2021-11-07 01:00:25,509 INFO L226 Difference]: Without dead ends: 58127 [2021-11-07 01:00:25,519 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2021-11-07 01:00:25,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58127 states. [2021-11-07 01:00:26,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58127 to 19706. [2021-11-07 01:00:26,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19706 states, 19704 states have (on average 1.788723101908242) internal successors, (35245), 19705 states have internal predecessors, (35245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:26,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19706 states to 19706 states and 35245 transitions. [2021-11-07 01:00:26,991 INFO L78 Accepts]: Start accepts. Automaton has 19706 states and 35245 transitions. Word has length 72 [2021-11-07 01:00:26,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:26,991 INFO L470 AbstractCegarLoop]: Abstraction has 19706 states and 35245 transitions. [2021-11-07 01:00:26,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 10.7) internal successors, (107), 10 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:26,992 INFO L276 IsEmpty]: Start isEmpty. Operand 19706 states and 35245 transitions. [2021-11-07 01:00:27,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 01:00:27,006 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:27,006 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] [2021-11-07 01:00:27,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-11-07 01:00:27,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-07 01:00:27,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:27,422 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:27,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:27,422 INFO L85 PathProgramCache]: Analyzing trace with hash 1987069249, now seen corresponding path program 1 times [2021-11-07 01:00:27,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:27,423 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1213676466] [2021-11-07 01:00:27,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:27,423 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:27,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:27,424 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:27,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:00:28,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:28,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:28,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:28,446 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:28,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:28,643 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:28,643 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:28,643 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1213676466] [2021-11-07 01:00:28,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1213676466] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:28,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1959739504] [2021-11-07 01:00:28,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:28,644 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:28,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:28,645 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:28,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:00:29,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:29,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:00:29,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:29,752 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:29,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:29,958 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:29,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1959739504] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:29,959 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:29,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 01:00:29,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356909630] [2021-11-07 01:00:29,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:00:29,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:29,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:00:29,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:00:29,961 INFO L87 Difference]: Start difference. First operand 19706 states and 35245 transitions. Second operand has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:32,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:32,979 INFO L93 Difference]: Finished difference Result 20012 states and 35739 transitions. [2021-11-07 01:00:32,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:00:32,980 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 01:00:32,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:33,024 INFO L225 Difference]: With dead ends: 20012 [2021-11-07 01:00:33,024 INFO L226 Difference]: Without dead ends: 19762 [2021-11-07 01:00:33,030 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:00:33,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19762 states. [2021-11-07 01:00:34,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19762 to 19700. [2021-11-07 01:00:34,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19700 states, 19698 states have (on average 1.7886079805056352) internal successors, (35232), 19699 states have internal predecessors, (35232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:34,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19700 states to 19700 states and 35232 transitions. [2021-11-07 01:00:34,257 INFO L78 Accepts]: Start accepts. Automaton has 19700 states and 35232 transitions. Word has length 73 [2021-11-07 01:00:34,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:34,258 INFO L470 AbstractCegarLoop]: Abstraction has 19700 states and 35232 transitions. [2021-11-07 01:00:34,258 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:34,258 INFO L276 IsEmpty]: Start isEmpty. Operand 19700 states and 35232 transitions. [2021-11-07 01:00:34,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 01:00:34,272 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:34,272 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] [2021-11-07 01:00:34,288 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-07 01:00:34,491 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2021-11-07 01:00:34,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:34,688 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:34,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:34,688 INFO L85 PathProgramCache]: Analyzing trace with hash -479438761, now seen corresponding path program 1 times [2021-11-07 01:00:34,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:34,689 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1839632358] [2021-11-07 01:00:34,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:34,689 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:34,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:34,690 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:34,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 01:00:35,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:35,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:00:35,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:35,561 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:35,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:35,717 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:35,718 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:35,718 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1839632358] [2021-11-07 01:00:35,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1839632358] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:35,718 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:35,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 01:00:35,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943848005] [2021-11-07 01:00:35,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:00:35,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:35,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:00:35,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:00:35,720 INFO L87 Difference]: Start difference. First operand 19700 states and 35232 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:36,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:36,702 INFO L93 Difference]: Finished difference Result 38502 states and 69078 transitions. [2021-11-07 01:00:36,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:00:36,703 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 01:00:36,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:36,734 INFO L225 Difference]: With dead ends: 38502 [2021-11-07 01:00:36,735 INFO L226 Difference]: Without dead ends: 19049 [2021-11-07 01:00:36,760 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 142 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 01:00:36,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19049 states. [2021-11-07 01:00:37,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19049 to 9888. [2021-11-07 01:00:37,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9888 states, 9886 states have (on average 1.7876795468339066) internal successors, (17673), 9887 states have internal predecessors, (17673), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:37,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9888 states to 9888 states and 17673 transitions. [2021-11-07 01:00:37,408 INFO L78 Accepts]: Start accepts. Automaton has 9888 states and 17673 transitions. Word has length 73 [2021-11-07 01:00:37,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:37,409 INFO L470 AbstractCegarLoop]: Abstraction has 9888 states and 17673 transitions. [2021-11-07 01:00:37,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:37,410 INFO L276 IsEmpty]: Start isEmpty. Operand 9888 states and 17673 transitions. [2021-11-07 01:00:37,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 01:00:37,418 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:37,418 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 01:00:37,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:37,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:37,634 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:37,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:37,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1920117293, now seen corresponding path program 1 times [2021-11-07 01:00:37,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:37,635 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [676422267] [2021-11-07 01:00:37,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:37,636 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:37,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:37,637 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:37,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 01:00:38,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:38,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:38,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:38,609 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:38,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:38,808 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:38,808 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:38,808 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [676422267] [2021-11-07 01:00:38,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [676422267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:38,808 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [770849228] [2021-11-07 01:00:38,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:38,808 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:38,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:38,810 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:38,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 01:00:39,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:39,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 01:00:39,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:40,014 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:40,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:40,160 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:40,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [770849228] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:40,160 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:40,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 5] total 13 [2021-11-07 01:00:40,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84270389] [2021-11-07 01:00:40,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:00:40,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:40,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:00:40,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:00:40,163 INFO L87 Difference]: Start difference. First operand 9888 states and 17673 transitions. Second operand has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 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 01:00:40,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:40,674 INFO L93 Difference]: Finished difference Result 9997 states and 17842 transitions. [2021-11-07 01:00:40,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:00:40,675 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 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 75 [2021-11-07 01:00:40,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:40,689 INFO L225 Difference]: With dead ends: 9997 [2021-11-07 01:00:40,689 INFO L226 Difference]: Without dead ends: 9888 [2021-11-07 01:00:40,692 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:00:40,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9888 states. [2021-11-07 01:00:41,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9888 to 9888. [2021-11-07 01:00:41,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9888 states, 9886 states have (on average 1.7874772405421808) internal successors, (17671), 9887 states have internal predecessors, (17671), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:41,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9888 states to 9888 states and 17671 transitions. [2021-11-07 01:00:41,244 INFO L78 Accepts]: Start accepts. Automaton has 9888 states and 17671 transitions. Word has length 75 [2021-11-07 01:00:41,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:41,244 INFO L470 AbstractCegarLoop]: Abstraction has 9888 states and 17671 transitions. [2021-11-07 01:00:41,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 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 01:00:41,244 INFO L276 IsEmpty]: Start isEmpty. Operand 9888 states and 17671 transitions. [2021-11-07 01:00:41,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 01:00:41,253 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:41,253 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 01:00:41,265 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:41,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:41,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:41,659 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:41,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:41,659 INFO L85 PathProgramCache]: Analyzing trace with hash 68948238, now seen corresponding path program 1 times [2021-11-07 01:00:41,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:41,660 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [330290409] [2021-11-07 01:00:41,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:41,660 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:41,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:41,661 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:41,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 01:00:42,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:42,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 525 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:42,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:42,705 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:42,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:42,915 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:42,915 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:42,915 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [330290409] [2021-11-07 01:00:42,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [330290409] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:42,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1868448429] [2021-11-07 01:00:42,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:42,916 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:42,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:42,917 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:42,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 01:00:44,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:44,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 525 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:00:44,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:44,305 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:44,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:44,531 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:44,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1868448429] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:44,531 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:44,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 01:00:44,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002141644] [2021-11-07 01:00:44,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:00:44,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:44,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:00:44,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:00:44,533 INFO L87 Difference]: Start difference. First operand 9888 states and 17671 transitions. Second operand has 11 states, 11 states have (on average 8.181818181818182) internal successors, (90), 11 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:47,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:47,685 INFO L93 Difference]: Finished difference Result 10552 states and 18692 transitions. [2021-11-07 01:00:47,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 01:00:47,685 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 8.181818181818182) internal successors, (90), 11 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-07 01:00:47,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:47,700 INFO L225 Difference]: With dead ends: 10552 [2021-11-07 01:00:47,700 INFO L226 Difference]: Without dead ends: 10443 [2021-11-07 01:00:47,703 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=469, Unknown=0, NotChecked=0, Total=600 [2021-11-07 01:00:47,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10443 states. [2021-11-07 01:00:48,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10443 to 10002. [2021-11-07 01:00:48,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10002 states, 10000 states have (on average 1.7851) internal successors, (17851), 10001 states have internal predecessors, (17851), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:48,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10002 states to 10002 states and 17851 transitions. [2021-11-07 01:00:48,381 INFO L78 Accepts]: Start accepts. Automaton has 10002 states and 17851 transitions. Word has length 78 [2021-11-07 01:00:48,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:48,381 INFO L470 AbstractCegarLoop]: Abstraction has 10002 states and 17851 transitions. [2021-11-07 01:00:48,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 8.181818181818182) internal successors, (90), 11 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:48,382 INFO L276 IsEmpty]: Start isEmpty. Operand 10002 states and 17851 transitions. [2021-11-07 01:00:48,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:00:48,387 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:48,388 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 01:00:48,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:48,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-11-07 01:00:48,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:48,793 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:48,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:48,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1765995935, now seen corresponding path program 1 times [2021-11-07 01:00:48,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:48,794 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1719531553] [2021-11-07 01:00:48,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:48,794 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:48,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:48,795 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:48,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 01:00:49,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:49,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:49,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:49,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:49,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:50,102 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:50,102 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:50,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1719531553] [2021-11-07 01:00:50,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1719531553] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:50,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2124275610] [2021-11-07 01:00:50,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:50,103 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:50,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:50,104 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:50,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 01:00:51,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:51,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:00:51,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:51,479 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:51,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:51,639 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:51,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2124275610] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:51,639 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:51,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:00:51,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414672173] [2021-11-07 01:00:51,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:00:51,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:51,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:00:51,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:00:51,641 INFO L87 Difference]: Start difference. First operand 10002 states and 17851 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 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 01:00:52,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:52,227 INFO L93 Difference]: Finished difference Result 10124 states and 18042 transitions. [2021-11-07 01:00:52,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:00:52,227 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 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 01:00:52,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:52,238 INFO L225 Difference]: With dead ends: 10124 [2021-11-07 01:00:52,238 INFO L226 Difference]: Without dead ends: 9951 [2021-11-07 01:00:52,244 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 302 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:00:52,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9951 states. [2021-11-07 01:00:52,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9951 to 9891. [2021-11-07 01:00:52,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9891 states, 9889 states have (on average 1.7870361007179694) internal successors, (17672), 9890 states have internal predecessors, (17672), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:52,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9891 states to 9891 states and 17672 transitions. [2021-11-07 01:00:52,753 INFO L78 Accepts]: Start accepts. Automaton has 9891 states and 17672 transitions. Word has length 79 [2021-11-07 01:00:52,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:52,753 INFO L470 AbstractCegarLoop]: Abstraction has 9891 states and 17672 transitions. [2021-11-07 01:00:52,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 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 01:00:52,753 INFO L276 IsEmpty]: Start isEmpty. Operand 9891 states and 17672 transitions. [2021-11-07 01:00:52,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:00:52,758 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:52,759 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 01:00:52,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:52,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:53,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:53,163 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:53,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:53,163 INFO L85 PathProgramCache]: Analyzing trace with hash 678200295, now seen corresponding path program 1 times [2021-11-07 01:00:53,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:53,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1303954836] [2021-11-07 01:00:53,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:53,164 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:53,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:53,164 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:53,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 01:00:54,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:54,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:54,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:54,319 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 01:00:54,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:54,531 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:54,532 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:54,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1303954836] [2021-11-07 01:00:54,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1303954836] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:54,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [246354178] [2021-11-07 01:00:54,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:54,532 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:54,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:54,533 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:54,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 01:00:55,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:55,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:00:55,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:56,039 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:56,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:56,205 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:56,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [246354178] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:56,206 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:56,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:00:56,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981169572] [2021-11-07 01:00:56,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:00:56,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:56,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:00:56,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:00:56,207 INFO L87 Difference]: Start difference. First operand 9891 states and 17672 transitions. Second operand has 9 states, 9 states have (on average 8.11111111111111) internal successors, (73), 9 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 01:00:56,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:56,928 INFO L93 Difference]: Finished difference Result 10103 states and 18004 transitions. [2021-11-07 01:00:56,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 01:00:56,929 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.11111111111111) internal successors, (73), 9 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 01:00:56,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:56,941 INFO L225 Difference]: With dead ends: 10103 [2021-11-07 01:00:56,941 INFO L226 Difference]: Without dead ends: 9965 [2021-11-07 01:00:56,944 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=165, Invalid=591, Unknown=0, NotChecked=0, Total=756 [2021-11-07 01:00:56,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9965 states. [2021-11-07 01:00:57,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9965 to 9888. [2021-11-07 01:00:57,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9888 states, 9886 states have (on average 1.7869714748128667) internal successors, (17666), 9887 states have internal predecessors, (17666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:57,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9888 states to 9888 states and 17666 transitions. [2021-11-07 01:00:57,527 INFO L78 Accepts]: Start accepts. Automaton has 9888 states and 17666 transitions. Word has length 79 [2021-11-07 01:00:57,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:57,528 INFO L470 AbstractCegarLoop]: Abstraction has 9888 states and 17666 transitions. [2021-11-07 01:00:57,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.11111111111111) internal successors, (73), 9 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 01:00:57,528 INFO L276 IsEmpty]: Start isEmpty. Operand 9888 states and 17666 transitions. [2021-11-07 01:00:57,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-07 01:00:57,535 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:57,536 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:57,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:57,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:57,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:57,936 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:57,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:57,937 INFO L85 PathProgramCache]: Analyzing trace with hash -18579894, now seen corresponding path program 1 times [2021-11-07 01:00:57,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:57,938 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1010620538] [2021-11-07 01:00:57,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:57,939 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:57,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:57,940 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:57,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 01:00:58,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:58,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:58,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:59,223 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:59,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:59,501 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:59,501 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:59,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1010620538] [2021-11-07 01:00:59,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1010620538] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:59,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [408506713] [2021-11-07 01:00:59,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:59,501 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:59,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:59,502 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:59,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 01:01:00,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:00,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:01:00,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:01,726 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:01,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:02,218 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:02,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [408506713] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:01:02,219 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:01:02,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:01:02,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131124970] [2021-11-07 01:01:02,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:01:02,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:01:02,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:01:02,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:01:02,221 INFO L87 Difference]: Start difference. First operand 9888 states and 17666 transitions. Second operand has 18 states, 18 states have (on average 8.11111111111111) internal successors, (146), 17 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:25,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:25,847 INFO L93 Difference]: Finished difference Result 31165 states and 55230 transitions. [2021-11-07 01:01:25,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-07 01:01:25,848 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.11111111111111) internal successors, (146), 17 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-07 01:01:25,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:25,889 INFO L225 Difference]: With dead ends: 31165 [2021-11-07 01:01:25,889 INFO L226 Difference]: Without dead ends: 31043 [2021-11-07 01:01:25,896 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=710, Invalid=2482, Unknown=0, NotChecked=0, Total=3192 [2021-11-07 01:01:25,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31043 states. [2021-11-07 01:01:27,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31043 to 19829. [2021-11-07 01:01:27,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19829 states, 19827 states have (on average 1.7862510717708175) internal successors, (35416), 19828 states have internal predecessors, (35416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:27,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19829 states to 19829 states and 35416 transitions. [2021-11-07 01:01:27,100 INFO L78 Accepts]: Start accepts. Automaton has 19829 states and 35416 transitions. Word has length 85 [2021-11-07 01:01:27,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:27,100 INFO L470 AbstractCegarLoop]: Abstraction has 19829 states and 35416 transitions. [2021-11-07 01:01:27,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.11111111111111) internal successors, (146), 17 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:27,100 INFO L276 IsEmpty]: Start isEmpty. Operand 19829 states and 35416 transitions. [2021-11-07 01:01:27,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 01:01:27,114 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:27,114 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:27,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:27,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:27,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:01:27,515 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:27,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:27,516 INFO L85 PathProgramCache]: Analyzing trace with hash -34913465, now seen corresponding path program 1 times [2021-11-07 01:01:27,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:01:27,516 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [597247789] [2021-11-07 01:01:27,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:27,516 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:01:27,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:01:27,517 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:01:27,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:01:28,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:28,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:01:28,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:28,940 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:28,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:29,209 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:29,210 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:01:29,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [597247789] [2021-11-07 01:01:29,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [597247789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:01:29,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [512853257] [2021-11-07 01:01:29,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:29,210 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:01:29,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:01:29,211 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:01:29,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:01:30,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:30,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:01:30,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:30,971 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:30,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:31,143 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:31,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [512853257] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:01:31,143 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:01:31,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:01:31,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961258752] [2021-11-07 01:01:31,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:01:31,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:01:31,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:01:31,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:01:31,144 INFO L87 Difference]: Start difference. First operand 19829 states and 35416 transitions. Second operand has 9 states, 9 states have (on average 8.88888888888889) internal successors, (80), 9 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:32,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:32,459 INFO L93 Difference]: Finished difference Result 20317 states and 36173 transitions. [2021-11-07 01:01:32,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 01:01:32,459 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.88888888888889) internal successors, (80), 9 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 01:01:32,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:32,486 INFO L225 Difference]: With dead ends: 20317 [2021-11-07 01:01:32,486 INFO L226 Difference]: Without dead ends: 20006 [2021-11-07 01:01:32,494 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=165, Invalid=591, Unknown=0, NotChecked=0, Total=756 [2021-11-07 01:01:32,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20006 states. [2021-11-07 01:01:33,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20006 to 19823. [2021-11-07 01:01:33,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19823 states, 19821 states have (on average 1.786085464910953) internal successors, (35402), 19822 states have internal predecessors, (35402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:33,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19823 states to 19823 states and 35402 transitions. [2021-11-07 01:01:33,763 INFO L78 Accepts]: Start accepts. Automaton has 19823 states and 35402 transitions. Word has length 86 [2021-11-07 01:01:33,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:33,764 INFO L470 AbstractCegarLoop]: Abstraction has 19823 states and 35402 transitions. [2021-11-07 01:01:33,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.88888888888889) internal successors, (80), 9 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:33,764 INFO L276 IsEmpty]: Start isEmpty. Operand 19823 states and 35402 transitions. [2021-11-07 01:01:33,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 01:01:33,777 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:33,777 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:33,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:33,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:34,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:01:34,179 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:34,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:34,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1326742012, now seen corresponding path program 1 times [2021-11-07 01:01:34,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:01:34,179 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1761805436] [2021-11-07 01:01:34,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:34,180 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:01:34,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:01:34,180 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:01:34,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:01:35,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:35,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:01:35,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:35,626 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:35,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:35,888 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:35,888 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:01:35,888 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1761805436] [2021-11-07 01:01:35,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1761805436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:01:35,888 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1333479873] [2021-11-07 01:01:35,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:35,888 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:01:35,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:01:35,891 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:01:35,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:01:37,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:37,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:01:37,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:37,857 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:37,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:38,087 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:38,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1333479873] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:01:38,087 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:01:38,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:01:38,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577284452] [2021-11-07 01:01:38,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:01:38,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:01:38,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:01:38,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:01:38,089 INFO L87 Difference]: Start difference. First operand 19823 states and 35402 transitions. Second operand has 9 states, 9 states have (on average 8.88888888888889) internal successors, (80), 9 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:44,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:01:44,362 INFO L93 Difference]: Finished difference Result 22556 states and 39540 transitions. [2021-11-07 01:01:44,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-07 01:01:44,363 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.88888888888889) internal successors, (80), 9 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 01:01:44,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:01:44,391 INFO L225 Difference]: With dead ends: 22556 [2021-11-07 01:01:44,391 INFO L226 Difference]: Without dead ends: 22263 [2021-11-07 01:01:44,396 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=280, Invalid=980, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 01:01:44,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22263 states. [2021-11-07 01:01:45,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22263 to 20181. [2021-11-07 01:01:45,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20181 states, 20179 states have (on average 1.7806630655632092) internal successors, (35932), 20180 states have internal predecessors, (35932), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:45,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20181 states to 20181 states and 35932 transitions. [2021-11-07 01:01:45,750 INFO L78 Accepts]: Start accepts. Automaton has 20181 states and 35932 transitions. Word has length 86 [2021-11-07 01:01:45,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:01:45,750 INFO L470 AbstractCegarLoop]: Abstraction has 20181 states and 35932 transitions. [2021-11-07 01:01:45,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.88888888888889) internal successors, (80), 9 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:01:45,750 INFO L276 IsEmpty]: Start isEmpty. Operand 20181 states and 35932 transitions. [2021-11-07 01:01:45,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 01:01:45,761 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:01:45,761 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:01:45,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:45,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 01:01:46,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:01:46,162 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:01:46,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:01:46,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1550215792, now seen corresponding path program 1 times [2021-11-07 01:01:46,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:01:46,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1137729407] [2021-11-07 01:01:46,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:46,163 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:01:46,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:01:46,164 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:01:46,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 01:01:47,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:47,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:01:47,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:47,616 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:47,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:47,839 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:01:47,839 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:01:47,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1137729407] [2021-11-07 01:01:47,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1137729407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:01:47,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1076848769] [2021-11-07 01:01:47,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:01:47,840 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:01:47,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:01:47,840 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:01:47,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 01:01:49,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:01:49,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:01:49,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:01:50,176 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:50,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:01:50,565 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:01:50,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1076848769] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:01:50,566 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:01:50,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:01:50,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724085313] [2021-11-07 01:01:50,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:01:50,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:01:50,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:01:50,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:01:50,567 INFO L87 Difference]: Start difference. First operand 20181 states and 35932 transitions. Second operand has 18 states, 18 states have (on average 8.222222222222221) internal successors, (148), 17 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:02:09,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:02:09,531 INFO L93 Difference]: Finished difference Result 53032 states and 93676 transitions. [2021-11-07 01:02:09,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-07 01:02:09,532 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.222222222222221) internal successors, (148), 17 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 01:02:09,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:02:09,618 INFO L225 Difference]: With dead ends: 53032 [2021-11-07 01:02:09,618 INFO L226 Difference]: Without dead ends: 52660 [2021-11-07 01:02:09,629 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=522, Invalid=1830, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 01:02:09,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52660 states. [2021-11-07 01:02:12,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52660 to 40197. [2021-11-07 01:02:12,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40197 states, 40195 states have (on average 1.7805448438860554) internal successors, (71569), 40196 states have internal predecessors, (71569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:02:12,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40197 states to 40197 states and 71569 transitions. [2021-11-07 01:02:12,999 INFO L78 Accepts]: Start accepts. Automaton has 40197 states and 71569 transitions. Word has length 86 [2021-11-07 01:02:12,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:02:12,999 INFO L470 AbstractCegarLoop]: Abstraction has 40197 states and 71569 transitions. [2021-11-07 01:02:12,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.222222222222221) internal successors, (148), 17 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:02:13,000 INFO L276 IsEmpty]: Start isEmpty. Operand 40197 states and 71569 transitions. [2021-11-07 01:02:13,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 01:02:13,023 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:02:13,024 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:02:13,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-07 01:02:13,239 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-07 01:02:13,424 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:02:13,425 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:02:13,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:02:13,425 INFO L85 PathProgramCache]: Analyzing trace with hash 1321093197, now seen corresponding path program 1 times [2021-11-07 01:02:13,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:02:13,426 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [753546803] [2021-11-07 01:02:13,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:02:13,426 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:02:13,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:02:13,427 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:02:13,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 01:02:14,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:02:14,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:02:14,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:02:14,958 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 01:02:14,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:02:15,265 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 01:02:15,265 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:02:15,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [753546803] [2021-11-07 01:02:15,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [753546803] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:02:15,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [796586074] [2021-11-07 01:02:15,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:02:15,266 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:02:15,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:02:15,267 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:02:15,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 01:02:17,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:02:17,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:02:17,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:02:17,750 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 01:02:17,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:02:18,216 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 01:02:18,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [796586074] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:02:18,216 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:02:18,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:02:18,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476409271] [2021-11-07 01:02:18,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:02:18,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:02:18,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:02:18,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:02:18,218 INFO L87 Difference]: Start difference. First operand 40197 states and 71569 transitions. Second operand has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:02:40,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:02:40,847 INFO L93 Difference]: Finished difference Result 95064 states and 167943 transitions. [2021-11-07 01:02:40,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-07 01:02:40,847 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 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 87 [2021-11-07 01:02:40,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:02:41,148 INFO L225 Difference]: With dead ends: 95064 [2021-11-07 01:02:41,148 INFO L226 Difference]: Without dead ends: 94352 [2021-11-07 01:02:41,166 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=522, Invalid=1830, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 01:02:41,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94352 states. [2021-11-07 01:02:47,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94352 to 79978. [2021-11-07 01:02:48,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79978 states, 79976 states have (on average 1.7805341602480744) internal successors, (142400), 79977 states have internal predecessors, (142400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:02:48,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79978 states to 79978 states and 142400 transitions. [2021-11-07 01:02:48,169 INFO L78 Accepts]: Start accepts. Automaton has 79978 states and 142400 transitions. Word has length 87 [2021-11-07 01:02:48,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:02:48,170 INFO L470 AbstractCegarLoop]: Abstraction has 79978 states and 142400 transitions. [2021-11-07 01:02:48,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:02:48,170 INFO L276 IsEmpty]: Start isEmpty. Operand 79978 states and 142400 transitions. [2021-11-07 01:02:48,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 01:02:48,224 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:02:48,224 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:02:48,232 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-07 01:02:48,444 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-07 01:02:48,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:02:48,632 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:02:48,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:02:48,633 INFO L85 PathProgramCache]: Analyzing trace with hash 734287183, now seen corresponding path program 1 times [2021-11-07 01:02:48,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:02:48,634 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [504457638] [2021-11-07 01:02:48,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:02:48,634 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:02:48,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:02:48,635 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:02:48,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 01:02:50,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:02:50,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:02:50,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:02:50,259 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 01:02:50,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:02:50,471 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 01:02:50,471 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:02:50,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [504457638] [2021-11-07 01:02:50,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [504457638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:02:50,473 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1479123325] [2021-11-07 01:02:50,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:02:50,473 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:02:50,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:02:50,474 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:02:50,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a387fc1-485e-4917-accd-edbf6e2a196c/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-07 01:02:52,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:02:52,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-07 01:02:52,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:02:52,741 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 01:02:52,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:02:53,136 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 01:02:53,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1479123325] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:02:53,136 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:02:53,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [5, 5] total 24 [2021-11-07 01:02:53,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257907212] [2021-11-07 01:02:53,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:02:53,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:02:53,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:02:53,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=491, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:02:53,137 INFO L87 Difference]: Start difference. First operand 79978 states and 142400 transitions. Second operand has 18 states, 18 states have (on average 8.166666666666666) internal successors, (147), 18 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)