./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec8_product31.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_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/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_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec8_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/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_0c01dc16-59a8-49af-96dd-4218889266e6/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 aa31ba7b6b6c5a20100c4ed7bd6bb53a6560ae9fc8557479e094a44cc1bad058 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:08:10,752 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:08:10,755 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:08:10,811 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:08:10,811 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:08:10,816 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:08:10,818 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:08:10,822 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:08:10,825 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:08:10,827 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:08:10,828 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:08:10,830 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:08:10,830 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:08:10,832 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:08:10,833 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:08:10,835 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:08:10,836 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:08:10,837 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:08:10,839 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:08:10,842 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:08:10,844 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:08:10,849 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:08:10,851 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:08:10,853 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:08:10,857 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:08:10,861 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:08:10,861 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:08:10,862 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:08:10,863 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:08:10,864 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:08:10,865 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:08:10,866 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:08:10,867 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:08:10,868 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:08:10,870 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:08:10,870 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:08:10,871 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:08:10,871 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:08:10,871 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:08:10,872 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:08:10,873 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:08:10,874 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:08:10,914 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:08:10,914 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:08:10,916 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:08:10,916 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:08:10,917 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:08:10,917 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:08:10,917 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:08:10,917 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:08:10,918 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:08:10,918 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:08:10,919 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:08:10,920 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:08:10,920 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:08:10,920 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:08:10,920 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:08:10,921 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:08:10,921 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:08:10,922 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:08:10,922 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:08:10,922 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:08:10,922 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:08:10,923 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:08:10,923 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:08:10,923 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:08:10,923 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:08:10,924 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:08:10,924 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:08:10,924 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:08:10,924 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:08:10,927 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:08:10,927 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:08:10,927 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:08:10,928 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:08:10,928 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:08:10,928 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:08:10,929 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:08:10,929 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:08:10,929 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:08:10,929 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:08:10,930 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_0c01dc16-59a8-49af-96dd-4218889266e6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aa31ba7b6b6c5a20100c4ed7bd6bb53a6560ae9fc8557479e094a44cc1bad058 [2021-11-07 01:08:11,209 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:08:11,239 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:08:11,241 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:08:11,243 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:08:11,244 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:08:11,245 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec8_product31.cil.c [2021-11-07 01:08:11,334 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data/7dcbcf898/93ca52512809429ea6662f405ef310dc/FLAG02748f383 [2021-11-07 01:08:11,992 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:08:11,993 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/sv-benchmarks/c/product-lines/email_spec8_product31.cil.c [2021-11-07 01:08:12,013 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data/7dcbcf898/93ca52512809429ea6662f405ef310dc/FLAG02748f383 [2021-11-07 01:08:12,207 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data/7dcbcf898/93ca52512809429ea6662f405ef310dc [2021-11-07 01:08:12,209 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:08:12,211 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:08:12,213 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:08:12,213 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:08:12,216 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:08:12,216 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:08:12" (1/1) ... [2021-11-07 01:08:12,217 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55f8e3fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:12, skipping insertion in model container [2021-11-07 01:08:12,218 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:08:12" (1/1) ... [2021-11-07 01:08:12,223 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:08:12,292 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:08:12,673 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_0c01dc16-59a8-49af-96dd-4218889266e6/sv-benchmarks/c/product-lines/email_spec8_product31.cil.c[36672,36685] [2021-11-07 01:08:12,975 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:08:12,994 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 01:08:12,995 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@4567f5be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:12, skipping insertion in model container [2021-11-07 01:08:12,995 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:08:12,996 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 01:08:12,998 INFO L168 Benchmark]: Toolchain (without parser) took 785.76 ms. Allocated memory was 102.8 MB in the beginning and 140.5 MB in the end (delta: 37.7 MB). Free memory was 65.8 MB in the beginning and 100.3 MB in the end (delta: -34.4 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-07 01:08:13,000 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 102.8 MB. Free memory is still 55.1 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:08:13,002 INFO L168 Benchmark]: CACSL2BoogieTranslator took 782.94 ms. Allocated memory was 102.8 MB in the beginning and 140.5 MB in the end (delta: 37.7 MB). Free memory was 65.6 MB in the beginning and 100.3 MB in the end (delta: -34.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-07 01:08:13,005 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 102.8 MB. Free memory is still 55.1 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 782.94 ms. Allocated memory was 102.8 MB in the beginning and 140.5 MB in the end (delta: 37.7 MB). Free memory was 65.6 MB in the beginning and 100.3 MB in the end (delta: -34.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 1157]: 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_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/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_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec8_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/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_0c01dc16-59a8-49af-96dd-4218889266e6/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 aa31ba7b6b6c5a20100c4ed7bd6bb53a6560ae9fc8557479e094a44cc1bad058 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:08:15,161 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:08:15,163 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:08:15,204 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:08:15,205 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:08:15,209 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:08:15,212 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:08:15,216 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:08:15,220 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:08:15,228 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:08:15,229 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:08:15,231 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:08:15,232 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:08:15,234 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:08:15,237 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:08:15,240 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:08:15,242 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:08:15,243 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:08:15,248 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:08:15,256 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:08:15,258 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:08:15,260 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:08:15,262 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:08:15,265 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:08:15,274 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:08:15,275 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:08:15,275 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:08:15,277 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:08:15,278 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:08:15,279 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:08:15,280 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:08:15,281 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:08:15,284 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:08:15,285 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:08:15,287 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:08:15,287 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:08:15,288 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:08:15,289 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:08:15,289 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:08:15,291 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:08:15,292 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:08:15,293 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 01:08:15,337 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:08:15,337 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:08:15,339 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:08:15,339 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:08:15,339 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:08:15,339 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:08:15,340 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:08:15,340 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:08:15,340 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:08:15,342 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:08:15,343 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:08:15,343 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:08:15,343 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:08:15,344 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:08:15,344 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:08:15,344 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:08:15,344 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:08:15,344 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 01:08:15,345 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 01:08:15,345 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:08:15,345 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:08:15,345 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:08:15,346 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:08:15,346 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:08:15,346 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 01:08:15,346 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:08:15,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:08:15,347 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:08:15,347 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:08:15,347 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:08:15,347 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 01:08:15,348 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:15,348 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:08:15,348 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:08:15,349 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:08:15,349 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_0c01dc16-59a8-49af-96dd-4218889266e6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> aa31ba7b6b6c5a20100c4ed7bd6bb53a6560ae9fc8557479e094a44cc1bad058 [2021-11-07 01:08:15,779 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:08:15,800 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:08:15,803 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:08:15,804 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:08:15,805 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:08:15,806 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec8_product31.cil.c [2021-11-07 01:08:15,877 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data/9c430d610/0368898f201143229150eb9daf4b16b0/FLAG0e3c9db10 [2021-11-07 01:08:16,558 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:08:16,559 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/sv-benchmarks/c/product-lines/email_spec8_product31.cil.c [2021-11-07 01:08:16,580 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data/9c430d610/0368898f201143229150eb9daf4b16b0/FLAG0e3c9db10 [2021-11-07 01:08:16,747 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/data/9c430d610/0368898f201143229150eb9daf4b16b0 [2021-11-07 01:08:16,750 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:08:16,752 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:08:16,753 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:08:16,754 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:08:16,757 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:08:16,758 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:08:16" (1/1) ... [2021-11-07 01:08:16,760 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24aa0c37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:16, skipping insertion in model container [2021-11-07 01:08:16,760 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:08:16" (1/1) ... [2021-11-07 01:08:16,767 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:08:16,843 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:08:17,308 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_0c01dc16-59a8-49af-96dd-4218889266e6/sv-benchmarks/c/product-lines/email_spec8_product31.cil.c[36672,36685] [2021-11-07 01:08:17,443 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:08:17,458 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 01:08:17,481 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:08:17,533 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_0c01dc16-59a8-49af-96dd-4218889266e6/sv-benchmarks/c/product-lines/email_spec8_product31.cil.c[36672,36685] [2021-11-07 01:08:17,571 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:08:17,578 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:08:17,625 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_0c01dc16-59a8-49af-96dd-4218889266e6/sv-benchmarks/c/product-lines/email_spec8_product31.cil.c[36672,36685] [2021-11-07 01:08:17,657 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:08:17,709 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:08:17,710 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17 WrapperNode [2021-11-07 01:08:17,710 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:08:17,711 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:08:17,712 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:08:17,712 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:08:17,719 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:17,757 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:17,845 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:08:17,846 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:08:17,846 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:08:17,847 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:08:17,855 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:17,855 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:17,875 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:17,875 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:17,948 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:18,021 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:18,027 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:18,041 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:08:18,042 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:08:18,042 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:08:18,042 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:08:18,043 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (1/1) ... [2021-11-07 01:08:18,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:08:18,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:08:18,089 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:08:18,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:08:18,136 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 01:08:18,137 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:08:18,138 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 01:08:18,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:08:18,139 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:08:22,730 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:08:22,730 INFO L299 CfgBuilder]: Removed 379 assume(true) statements. [2021-11-07 01:08:22,733 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:08:22 BoogieIcfgContainer [2021-11-07 01:08:22,734 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:08:22,736 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:08:22,736 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:08:22,739 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:08:22,739 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:08:16" (1/3) ... [2021-11-07 01:08:22,740 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5df542ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:08:22, skipping insertion in model container [2021-11-07 01:08:22,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:17" (2/3) ... [2021-11-07 01:08:22,741 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5df542ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:08:22, skipping insertion in model container [2021-11-07 01:08:22,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:08:22" (3/3) ... [2021-11-07 01:08:22,742 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec8_product31.cil.c [2021-11-07 01:08:22,748 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:08:22,748 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 01:08:22,805 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:08:22,812 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 01:08:22,812 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 01:08:22,840 INFO L276 IsEmpty]: Start isEmpty. Operand has 567 states, 564 states have (on average 1.7340425531914894) internal successors, (978), 566 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:22,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 01:08:22,852 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:22,853 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:22,853 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:22,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:22,859 INFO L85 PathProgramCache]: Analyzing trace with hash -1606635459, now seen corresponding path program 1 times [2021-11-07 01:08:22,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:22,874 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [494947395] [2021-11-07 01:08:22,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:22,875 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:22,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:22,878 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:22,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 01:08:23,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:23,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 01:08:23,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:23,511 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 01:08:23,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:23,640 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 01:08:23,641 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:23,641 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [494947395] [2021-11-07 01:08:23,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [494947395] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:23,643 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:23,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 01:08:23,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089300816] [2021-11-07 01:08:23,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 01:08:23,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:23,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 01:08:23,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:08:23,674 INFO L87 Difference]: Start difference. First operand has 567 states, 564 states have (on average 1.7340425531914894) internal successors, (978), 566 states have internal predecessors, (978), 0 states have call successors, (0), 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 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:23,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:23,759 INFO L93 Difference]: Finished difference Result 892 states and 1515 transitions. [2021-11-07 01:08:23,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 01:08:23,761 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 01:08:23,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:23,786 INFO L225 Difference]: With dead ends: 892 [2021-11-07 01:08:23,786 INFO L226 Difference]: Without dead ends: 454 [2021-11-07 01:08:23,795 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:08:23,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-11-07 01:08:23,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 454. [2021-11-07 01:08:23,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 452 states have (on average 1.741150442477876) internal successors, (787), 453 states have internal predecessors, (787), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:23,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 787 transitions. [2021-11-07 01:08:23,873 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 787 transitions. Word has length 45 [2021-11-07 01:08:23,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:23,883 INFO L470 AbstractCegarLoop]: Abstraction has 454 states and 787 transitions. [2021-11-07 01:08:23,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:23,884 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 787 transitions. [2021-11-07 01:08:23,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 01:08:23,888 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:23,888 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:23,900 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-07 01:08:24,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:24,091 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:24,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:24,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1561846480, now seen corresponding path program 1 times [2021-11-07 01:08:24,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:24,094 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [975322755] [2021-11-07 01:08:24,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:24,094 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:24,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:24,098 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:24,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 01:08:24,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:24,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:08:24,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:24,720 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 01:08:24,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:24,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:24,855 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:24,855 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [975322755] [2021-11-07 01:08:24,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [975322755] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:24,856 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:24,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:08:24,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774440065] [2021-11-07 01:08:24,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:24,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:24,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:24,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:24,859 INFO L87 Difference]: Start difference. First operand 454 states and 787 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:24,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:24,990 INFO L93 Difference]: Finished difference Result 1332 states and 2313 transitions. [2021-11-07 01:08:24,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:08:24,991 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 01:08:24,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:24,997 INFO L225 Difference]: With dead ends: 1332 [2021-11-07 01:08:24,997 INFO L226 Difference]: Without dead ends: 893 [2021-11-07 01:08:25,000 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 88 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 01:08:25,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 893 states. [2021-11-07 01:08:25,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 893 to 453. [2021-11-07 01:08:25,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 451 states have (on average 1.7339246119733924) internal successors, (782), 452 states have internal predecessors, (782), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:25,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 782 transitions. [2021-11-07 01:08:25,060 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 782 transitions. Word has length 46 [2021-11-07 01:08:25,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:25,061 INFO L470 AbstractCegarLoop]: Abstraction has 453 states and 782 transitions. [2021-11-07 01:08:25,062 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:25,062 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 782 transitions. [2021-11-07 01:08:25,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 01:08:25,075 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:25,076 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 01:08:25,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:25,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:25,297 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:25,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:25,299 INFO L85 PathProgramCache]: Analyzing trace with hash -1854889078, now seen corresponding path program 1 times [2021-11-07 01:08:25,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:25,302 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1798899152] [2021-11-07 01:08:25,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:25,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:25,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:25,304 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:25,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 01:08:25,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:25,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:08:25,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:25,883 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 01:08:25,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:26,034 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 01:08:26,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:26,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1798899152] [2021-11-07 01:08:26,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1798899152] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:26,035 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:26,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:08:26,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045190813] [2021-11-07 01:08:26,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:08:26,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:26,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:08:26,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:08:26,037 INFO L87 Difference]: Start difference. First operand 453 states and 782 transitions. Second operand has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:26,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:26,276 INFO L93 Difference]: Finished difference Result 1729 states and 2990 transitions. [2021-11-07 01:08:26,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:08:26,276 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 01:08:26,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:26,285 INFO L225 Difference]: With dead ends: 1729 [2021-11-07 01:08:26,285 INFO L226 Difference]: Without dead ends: 1294 [2021-11-07 01:08:26,287 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:08:26,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1294 states. [2021-11-07 01:08:26,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1294 to 452. [2021-11-07 01:08:26,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 450 states have (on average 1.728888888888889) internal successors, (778), 451 states have internal predecessors, (778), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:26,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 778 transitions. [2021-11-07 01:08:26,335 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 778 transitions. Word has length 48 [2021-11-07 01:08:26,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:26,336 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 778 transitions. [2021-11-07 01:08:26,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:26,338 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 778 transitions. [2021-11-07 01:08:26,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 01:08:26,341 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:26,341 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] [2021-11-07 01:08:26,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:26,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:26,556 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:26,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:26,557 INFO L85 PathProgramCache]: Analyzing trace with hash -65220393, now seen corresponding path program 1 times [2021-11-07 01:08:26,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:26,558 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [736592125] [2021-11-07 01:08:26,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:26,558 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:26,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:26,560 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:26,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 01:08:27,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:27,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:08:27,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:27,166 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 01:08:27,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:27,321 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 01:08:27,322 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:27,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [736592125] [2021-11-07 01:08:27,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [736592125] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:27,322 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:27,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:08:27,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528002905] [2021-11-07 01:08:27,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:27,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:27,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:27,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:27,325 INFO L87 Difference]: Start difference. First operand 452 states and 778 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:27,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:27,397 INFO L93 Difference]: Finished difference Result 901 states and 1553 transitions. [2021-11-07 01:08:27,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:08:27,397 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 01:08:27,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:27,401 INFO L225 Difference]: With dead ends: 901 [2021-11-07 01:08:27,401 INFO L226 Difference]: Without dead ends: 457 [2021-11-07 01:08:27,402 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 94 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 01:08:27,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-11-07 01:08:27,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 452. [2021-11-07 01:08:27,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 450 states have (on average 1.7222222222222223) internal successors, (775), 451 states have internal predecessors, (775), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:27,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 775 transitions. [2021-11-07 01:08:27,441 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 775 transitions. Word has length 49 [2021-11-07 01:08:27,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:27,441 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 775 transitions. [2021-11-07 01:08:27,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:27,442 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 775 transitions. [2021-11-07 01:08:27,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 01:08:27,443 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:27,443 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] [2021-11-07 01:08:27,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:27,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:27,657 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:27,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:27,657 INFO L85 PathProgramCache]: Analyzing trace with hash 1735348642, now seen corresponding path program 1 times [2021-11-07 01:08:27,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:27,658 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1434265470] [2021-11-07 01:08:27,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:27,659 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:27,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:27,664 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:27,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 01:08:28,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:28,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:08:28,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:28,255 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 01:08:28,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:28,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:28,404 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:28,404 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1434265470] [2021-11-07 01:08:28,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1434265470] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:28,405 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:28,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:08:28,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135389767] [2021-11-07 01:08:28,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:08:28,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:28,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:08:28,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:08:28,408 INFO L87 Difference]: Start difference. First operand 452 states and 775 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:28,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:28,669 INFO L93 Difference]: Finished difference Result 1716 states and 2966 transitions. [2021-11-07 01:08:28,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:08:28,669 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-07 01:08:28,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:28,677 INFO L225 Difference]: With dead ends: 1716 [2021-11-07 01:08:28,678 INFO L226 Difference]: Without dead ends: 1290 [2021-11-07 01:08:28,679 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 94 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 01:08:28,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1290 states. [2021-11-07 01:08:28,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1290 to 452. [2021-11-07 01:08:28,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 450 states have (on average 1.7155555555555555) internal successors, (772), 451 states have internal predecessors, (772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:28,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 772 transitions. [2021-11-07 01:08:28,722 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 772 transitions. Word has length 50 [2021-11-07 01:08:28,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:28,722 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 772 transitions. [2021-11-07 01:08:28,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:28,723 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 772 transitions. [2021-11-07 01:08:28,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 01:08:28,724 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:28,724 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 01:08:28,742 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-07 01:08:28,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:28,939 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:28,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:28,939 INFO L85 PathProgramCache]: Analyzing trace with hash -114337145, now seen corresponding path program 1 times [2021-11-07 01:08:28,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:28,941 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [475773704] [2021-11-07 01:08:28,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:28,941 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:28,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:28,942 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:28,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 01:08:29,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:29,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:29,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:29,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:29,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:29,664 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 01:08:29,664 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:29,665 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [475773704] [2021-11-07 01:08:29,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [475773704] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:29,665 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:29,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:08:29,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862195710] [2021-11-07 01:08:29,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:29,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:29,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:29,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:29,667 INFO L87 Difference]: Start difference. First operand 452 states and 772 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 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 01:08:29,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:29,764 INFO L93 Difference]: Finished difference Result 1090 states and 1863 transitions. [2021-11-07 01:08:29,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:08:29,765 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 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 52 [2021-11-07 01:08:29,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:29,770 INFO L225 Difference]: With dead ends: 1090 [2021-11-07 01:08:29,771 INFO L226 Difference]: Without dead ends: 878 [2021-11-07 01:08:29,772 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 100 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 01:08:29,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 878 states. [2021-11-07 01:08:29,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 878 to 666. [2021-11-07 01:08:29,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 666 states, 664 states have (on average 1.7515060240963856) internal successors, (1163), 665 states have internal predecessors, (1163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:29,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 666 states to 666 states and 1163 transitions. [2021-11-07 01:08:29,826 INFO L78 Accepts]: Start accepts. Automaton has 666 states and 1163 transitions. Word has length 52 [2021-11-07 01:08:29,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:29,827 INFO L470 AbstractCegarLoop]: Abstraction has 666 states and 1163 transitions. [2021-11-07 01:08:29,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 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 01:08:29,827 INFO L276 IsEmpty]: Start isEmpty. Operand 666 states and 1163 transitions. [2021-11-07 01:08:29,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 01:08:29,829 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:29,829 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:29,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:30,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:30,044 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:30,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:30,044 INFO L85 PathProgramCache]: Analyzing trace with hash 1930870742, now seen corresponding path program 1 times [2021-11-07 01:08:30,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:30,045 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2057556334] [2021-11-07 01:08:30,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:30,045 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:30,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:30,046 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:30,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 01:08:30,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:30,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:30,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:30,619 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 01:08:30,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:30,748 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 01:08:30,749 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:30,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2057556334] [2021-11-07 01:08:30,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2057556334] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:30,749 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:30,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:08:30,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588291791] [2021-11-07 01:08:30,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:08:30,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:30,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:08:30,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:30,751 INFO L87 Difference]: Start difference. First operand 666 states and 1163 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:30,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:30,854 INFO L93 Difference]: Finished difference Result 1622 states and 2837 transitions. [2021-11-07 01:08:30,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:30,855 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 01:08:30,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:30,862 INFO L225 Difference]: With dead ends: 1622 [2021-11-07 01:08:30,862 INFO L226 Difference]: Without dead ends: 1040 [2021-11-07 01:08:30,863 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:30,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1040 states. [2021-11-07 01:08:30,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1040 to 828. [2021-11-07 01:08:30,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 828 states, 826 states have (on average 1.7639225181598064) internal successors, (1457), 827 states have internal predecessors, (1457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:30,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 828 states to 828 states and 1457 transitions. [2021-11-07 01:08:30,938 INFO L78 Accepts]: Start accepts. Automaton has 828 states and 1457 transitions. Word has length 64 [2021-11-07 01:08:30,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:30,939 INFO L470 AbstractCegarLoop]: Abstraction has 828 states and 1457 transitions. [2021-11-07 01:08:30,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:30,939 INFO L276 IsEmpty]: Start isEmpty. Operand 828 states and 1457 transitions. [2021-11-07 01:08:30,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 01:08:30,941 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:30,941 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:30,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:31,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:31,157 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:31,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:31,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1961484329, now seen corresponding path program 1 times [2021-11-07 01:08:31,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:31,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [576025091] [2021-11-07 01:08:31,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:31,163 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:31,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:31,164 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:31,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:08:31,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:31,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:31,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:31,799 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 01:08:31,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:31,960 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 01:08:31,960 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:31,960 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [576025091] [2021-11-07 01:08:31,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [576025091] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:31,961 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:31,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:08:31,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135691723] [2021-11-07 01:08:31,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:08:31,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:31,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:08:31,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:31,963 INFO L87 Difference]: Start difference. First operand 828 states and 1457 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:32,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:32,094 INFO L93 Difference]: Finished difference Result 2152 states and 3805 transitions. [2021-11-07 01:08:32,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:32,094 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-07 01:08:32,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:32,103 INFO L225 Difference]: With dead ends: 2152 [2021-11-07 01:08:32,104 INFO L226 Difference]: Without dead ends: 1412 [2021-11-07 01:08:32,107 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:32,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1412 states. [2021-11-07 01:08:32,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1412 to 1200. [2021-11-07 01:08:32,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1200 states, 1198 states have (on average 1.7821368948247078) internal successors, (2135), 1199 states have internal predecessors, (2135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:32,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1200 states to 1200 states and 2135 transitions. [2021-11-07 01:08:32,221 INFO L78 Accepts]: Start accepts. Automaton has 1200 states and 2135 transitions. Word has length 65 [2021-11-07 01:08:32,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:32,221 INFO L470 AbstractCegarLoop]: Abstraction has 1200 states and 2135 transitions. [2021-11-07 01:08:32,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:32,222 INFO L276 IsEmpty]: Start isEmpty. Operand 1200 states and 2135 transitions. [2021-11-07 01:08:32,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 01:08:32,224 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:32,225 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] [2021-11-07 01:08:32,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:32,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:32,440 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:32,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:32,441 INFO L85 PathProgramCache]: Analyzing trace with hash -1828122329, now seen corresponding path program 1 times [2021-11-07 01:08:32,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:32,441 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1797284377] [2021-11-07 01:08:32,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:32,442 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:32,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:32,443 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:32,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 01:08:32,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:32,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:32,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:33,105 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 01:08:33,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:33,262 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 01:08:33,263 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:33,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1797284377] [2021-11-07 01:08:33,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1797284377] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:33,263 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:33,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:08:33,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779978819] [2021-11-07 01:08:33,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:33,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:33,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:33,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:33,265 INFO L87 Difference]: Start difference. First operand 1200 states and 2135 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:33,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:33,418 INFO L93 Difference]: Finished difference Result 2366 states and 4193 transitions. [2021-11-07 01:08:33,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:33,419 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 01:08:33,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:33,428 INFO L225 Difference]: With dead ends: 2366 [2021-11-07 01:08:33,429 INFO L226 Difference]: Without dead ends: 1412 [2021-11-07 01:08:33,433 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 128 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 01:08:33,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1412 states. [2021-11-07 01:08:33,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1412 to 1200. [2021-11-07 01:08:33,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1200 states, 1198 states have (on average 1.7804674457429048) internal successors, (2133), 1199 states have internal predecessors, (2133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:33,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1200 states to 1200 states and 2133 transitions. [2021-11-07 01:08:33,533 INFO L78 Accepts]: Start accepts. Automaton has 1200 states and 2133 transitions. Word has length 66 [2021-11-07 01:08:33,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:33,535 INFO L470 AbstractCegarLoop]: Abstraction has 1200 states and 2133 transitions. [2021-11-07 01:08:33,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:33,536 INFO L276 IsEmpty]: Start isEmpty. Operand 1200 states and 2133 transitions. [2021-11-07 01:08:33,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 01:08:33,538 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:33,538 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 01:08:33,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:33,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:33,753 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:33,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:33,753 INFO L85 PathProgramCache]: Analyzing trace with hash -404514456, now seen corresponding path program 1 times [2021-11-07 01:08:33,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:33,754 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [626889357] [2021-11-07 01:08:33,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:33,754 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:33,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:33,755 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:33,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 01:08:34,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:34,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:34,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:34,384 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 01:08:34,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:34,514 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 01:08:34,514 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:34,514 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [626889357] [2021-11-07 01:08:34,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [626889357] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:34,514 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:34,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:08:34,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974158460] [2021-11-07 01:08:34,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:08:34,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:34,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:08:34,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:34,516 INFO L87 Difference]: Start difference. First operand 1200 states and 2133 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 01:08:34,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:34,691 INFO L93 Difference]: Finished difference Result 3240 states and 5788 transitions. [2021-11-07 01:08:34,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:34,692 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 01:08:34,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:34,705 INFO L225 Difference]: With dead ends: 3240 [2021-11-07 01:08:34,706 INFO L226 Difference]: Without dead ends: 2136 [2021-11-07 01:08:34,708 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 01:08:34,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2136 states. [2021-11-07 01:08:34,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2136 to 1924. [2021-11-07 01:08:34,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1924 states, 1922 states have (on average 1.7960457856399583) internal successors, (3452), 1923 states have internal predecessors, (3452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:34,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1924 states to 1924 states and 3452 transitions. [2021-11-07 01:08:34,867 INFO L78 Accepts]: Start accepts. Automaton has 1924 states and 3452 transitions. Word has length 66 [2021-11-07 01:08:34,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:34,868 INFO L470 AbstractCegarLoop]: Abstraction has 1924 states and 3452 transitions. [2021-11-07 01:08:34,868 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 01:08:34,868 INFO L276 IsEmpty]: Start isEmpty. Operand 1924 states and 3452 transitions. [2021-11-07 01:08:34,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 01:08:34,877 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:34,877 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 01:08:34,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:35,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:35,098 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:35,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:35,098 INFO L85 PathProgramCache]: Analyzing trace with hash -1154205355, now seen corresponding path program 1 times [2021-11-07 01:08:35,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:35,099 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [730320686] [2021-11-07 01:08:35,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:35,099 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:35,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:35,100 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:35,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 01:08:35,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:35,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:35,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:35,845 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 01:08:35,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:36,013 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 01:08:36,013 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:36,013 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [730320686] [2021-11-07 01:08:36,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [730320686] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:36,013 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:36,014 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:08:36,014 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422993992] [2021-11-07 01:08:36,014 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:08:36,014 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:36,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:08:36,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:36,015 INFO L87 Difference]: Start difference. First operand 1924 states and 3452 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 01:08:36,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:36,258 INFO L93 Difference]: Finished difference Result 5148 states and 9264 transitions. [2021-11-07 01:08:36,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:36,259 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 01:08:36,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:36,280 INFO L225 Difference]: With dead ends: 5148 [2021-11-07 01:08:36,280 INFO L226 Difference]: Without dead ends: 3354 [2021-11-07 01:08:36,283 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 01:08:36,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3354 states. [2021-11-07 01:08:36,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3354 to 3142. [2021-11-07 01:08:36,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3142 states, 3140 states have (on average 1.8041401273885351) internal successors, (5665), 3141 states have internal predecessors, (5665), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:36,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3142 states to 3142 states and 5665 transitions. [2021-11-07 01:08:36,523 INFO L78 Accepts]: Start accepts. Automaton has 3142 states and 5665 transitions. Word has length 67 [2021-11-07 01:08:36,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:36,523 INFO L470 AbstractCegarLoop]: Abstraction has 3142 states and 5665 transitions. [2021-11-07 01:08:36,524 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 01:08:36,524 INFO L276 IsEmpty]: Start isEmpty. Operand 3142 states and 5665 transitions. [2021-11-07 01:08:36,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:08:36,528 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:36,529 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 01:08:36,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:36,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:36,744 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:36,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:36,744 INFO L85 PathProgramCache]: Analyzing trace with hash -1389331721, now seen corresponding path program 1 times [2021-11-07 01:08:36,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:36,745 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [405099076] [2021-11-07 01:08:36,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:36,745 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:36,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:36,746 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:36,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 01:08:37,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:37,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:37,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:37,421 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 01:08:37,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:37,591 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 01:08:37,591 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:37,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [405099076] [2021-11-07 01:08:37,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [405099076] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:37,592 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:37,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:08:37,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396837442] [2021-11-07 01:08:37,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:08:37,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:37,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:08:37,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:37,593 INFO L87 Difference]: Start difference. First operand 3142 states and 5665 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 01:08:37,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:37,910 INFO L93 Difference]: Finished difference Result 8518 states and 15386 transitions. [2021-11-07 01:08:37,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:37,911 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 01:08:37,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:37,946 INFO L225 Difference]: With dead ends: 8518 [2021-11-07 01:08:37,946 INFO L226 Difference]: Without dead ends: 5540 [2021-11-07 01:08:37,951 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 01:08:37,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5540 states. [2021-11-07 01:08:38,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5540 to 5328. [2021-11-07 01:08:38,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5328 states, 5326 states have (on average 1.8073601201652272) internal successors, (9626), 5327 states have internal predecessors, (9626), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:38,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5328 states to 5328 states and 9626 transitions. [2021-11-07 01:08:38,363 INFO L78 Accepts]: Start accepts. Automaton has 5328 states and 9626 transitions. Word has length 68 [2021-11-07 01:08:38,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:38,363 INFO L470 AbstractCegarLoop]: Abstraction has 5328 states and 9626 transitions. [2021-11-07 01:08:38,364 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 01:08:38,364 INFO L276 IsEmpty]: Start isEmpty. Operand 5328 states and 9626 transitions. [2021-11-07 01:08:38,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:08:38,370 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:38,370 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] [2021-11-07 01:08:38,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:38,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:38,586 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:38,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:38,587 INFO L85 PathProgramCache]: Analyzing trace with hash -218784173, now seen corresponding path program 1 times [2021-11-07 01:08:38,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:38,587 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1166592059] [2021-11-07 01:08:38,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:38,588 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:38,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:38,589 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:38,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 01:08:39,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:39,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:39,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:39,387 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 01:08:39,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:39,597 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 01:08:39,598 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:39,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1166592059] [2021-11-07 01:08:39,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1166592059] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:39,598 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:39,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:08:39,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025568452] [2021-11-07 01:08:39,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:08:39,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:39,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:08:39,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:08:39,601 INFO L87 Difference]: Start difference. First operand 5328 states and 9626 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:42,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:42,642 INFO L93 Difference]: Finished difference Result 19952 states and 36085 transitions. [2021-11-07 01:08:42,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:08:42,643 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 01:08:42,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:42,727 INFO L225 Difference]: With dead ends: 19952 [2021-11-07 01:08:42,727 INFO L226 Difference]: Without dead ends: 14868 [2021-11-07 01:08:42,737 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 132 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 01:08:42,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14868 states. [2021-11-07 01:08:43,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14868 to 5278. [2021-11-07 01:08:43,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5278 states, 5276 states have (on average 1.7865807429871114) internal successors, (9426), 5277 states have internal predecessors, (9426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:43,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5278 states to 5278 states and 9426 transitions. [2021-11-07 01:08:43,277 INFO L78 Accepts]: Start accepts. Automaton has 5278 states and 9426 transitions. Word has length 69 [2021-11-07 01:08:43,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:43,277 INFO L470 AbstractCegarLoop]: Abstraction has 5278 states and 9426 transitions. [2021-11-07 01:08:43,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:43,278 INFO L276 IsEmpty]: Start isEmpty. Operand 5278 states and 9426 transitions. [2021-11-07 01:08:43,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:08:43,285 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:43,285 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 01:08:43,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:43,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:43,500 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:43,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:43,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1533136700, now seen corresponding path program 1 times [2021-11-07 01:08:43,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:43,501 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [721285627] [2021-11-07 01:08:43,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:43,502 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:43,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:43,503 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:43,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:08:44,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:44,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:44,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:44,446 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 01:08:44,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:44,606 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 01:08:44,606 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:44,606 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [721285627] [2021-11-07 01:08:44,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [721285627] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:44,606 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:44,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:08:44,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881400506] [2021-11-07 01:08:44,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:08:44,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:44,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:08:44,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:44,608 INFO L87 Difference]: Start difference. First operand 5278 states and 9426 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 01:08:45,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:45,114 INFO L93 Difference]: Finished difference Result 15255 states and 27292 transitions. [2021-11-07 01:08:45,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:45,116 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 01:08:45,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:45,142 INFO L225 Difference]: With dead ends: 15255 [2021-11-07 01:08:45,142 INFO L226 Difference]: Without dead ends: 10148 [2021-11-07 01:08:45,150 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 01:08:45,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10148 states. [2021-11-07 01:08:45,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10148 to 9936. [2021-11-07 01:08:45,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9936 states, 9934 states have (on average 1.7881014697000202) internal successors, (17763), 9935 states have internal predecessors, (17763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:45,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9936 states to 9936 states and 17763 transitions. [2021-11-07 01:08:45,869 INFO L78 Accepts]: Start accepts. Automaton has 9936 states and 17763 transitions. Word has length 69 [2021-11-07 01:08:45,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:45,869 INFO L470 AbstractCegarLoop]: Abstraction has 9936 states and 17763 transitions. [2021-11-07 01:08:45,869 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 01:08:45,869 INFO L276 IsEmpty]: Start isEmpty. Operand 9936 states and 17763 transitions. [2021-11-07 01:08:45,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 01:08:45,876 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:45,876 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] [2021-11-07 01:08:45,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:46,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:46,088 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:46,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:46,089 INFO L85 PathProgramCache]: Analyzing trace with hash 819659064, now seen corresponding path program 1 times [2021-11-07 01:08:46,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:46,090 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [53208228] [2021-11-07 01:08:46,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:46,090 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:46,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:46,091 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:46,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 01:08:46,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:46,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:46,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:46,874 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 01:08:46,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:47,060 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 01:08:47,060 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:47,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [53208228] [2021-11-07 01:08:47,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [53208228] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:47,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [119956443] [2021-11-07 01:08:47,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:47,061 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:47,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:47,063 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:47,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 01:08:47,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:47,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:47,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:48,103 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 01:08:48,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:48,323 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 01:08:48,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [119956443] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:48,323 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:08:48,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 01:08:48,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545448930] [2021-11-07 01:08:48,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:08:48,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:48,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:08:48,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 01:08:48,325 INFO L87 Difference]: Start difference. First operand 9936 states and 17763 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:48,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:48,759 INFO L93 Difference]: Finished difference Result 10095 states and 18023 transitions. [2021-11-07 01:08:48,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:48,760 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-07 01:08:48,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:48,786 INFO L225 Difference]: With dead ends: 10095 [2021-11-07 01:08:48,786 INFO L226 Difference]: Without dead ends: 9930 [2021-11-07 01:08:48,790 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 269 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 01:08:48,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9930 states. [2021-11-07 01:08:49,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9930 to 9930. [2021-11-07 01:08:49,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9930 states, 9929 states have (on average 1.7880954778930407) internal successors, (17754), 9929 states have internal predecessors, (17754), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:49,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9930 states to 9930 states and 17754 transitions. [2021-11-07 01:08:49,595 INFO L78 Accepts]: Start accepts. Automaton has 9930 states and 17754 transitions. Word has length 70 [2021-11-07 01:08:49,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:49,595 INFO L470 AbstractCegarLoop]: Abstraction has 9930 states and 17754 transitions. [2021-11-07 01:08:49,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:49,595 INFO L276 IsEmpty]: Start isEmpty. Operand 9930 states and 17754 transitions. [2021-11-07 01:08:49,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-07 01:08:49,621 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:49,622 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:49,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:49,840 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-07 01:08:50,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:50,037 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:50,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:50,037 INFO L85 PathProgramCache]: Analyzing trace with hash -676748605, now seen corresponding path program 1 times [2021-11-07 01:08:50,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:50,038 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [704033803] [2021-11-07 01:08:50,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:50,038 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:50,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:50,039 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:50,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:08:50,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:50,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:50,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:51,066 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 01:08:51,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:51,340 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 01:08:51,340 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:51,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [704033803] [2021-11-07 01:08:51,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [704033803] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:51,340 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [687674123] [2021-11-07 01:08:51,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:51,341 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:51,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:51,341 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:51,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:08:52,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:52,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:08:52,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:52,626 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 01:08:52,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:53,008 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 01:08:53,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [687674123] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:53,009 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:08:53,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 01:08:53,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898392643] [2021-11-07 01:08:53,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:08:53,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:53,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:08:53,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:08:53,011 INFO L87 Difference]: Start difference. First operand 9930 states and 17754 transitions. Second operand has 10 states, 10 states have (on average 14.6) internal successors, (146), 10 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 01:08:58,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:58,542 INFO L93 Difference]: Finished difference Result 59773 states and 107264 transitions. [2021-11-07 01:08:58,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 01:08:58,542 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 14.6) internal successors, (146), 10 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 111 [2021-11-07 01:08:58,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:58,695 INFO L225 Difference]: With dead ends: 59773 [2021-11-07 01:08:58,695 INFO L226 Difference]: Without dead ends: 59585 [2021-11-07 01:08:58,707 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 426 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 01:08:58,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59585 states. [2021-11-07 01:09:00,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59585 to 19808. [2021-11-07 01:09:00,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19808 states, 19807 states have (on average 1.7883576513353865) internal successors, (35422), 19807 states have internal predecessors, (35422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:00,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19808 states to 19808 states and 35422 transitions. [2021-11-07 01:09:00,086 INFO L78 Accepts]: Start accepts. Automaton has 19808 states and 35422 transitions. Word has length 111 [2021-11-07 01:09:00,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:00,087 INFO L470 AbstractCegarLoop]: Abstraction has 19808 states and 35422 transitions. [2021-11-07 01:09:00,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 14.6) internal successors, (146), 10 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 01:09:00,087 INFO L276 IsEmpty]: Start isEmpty. Operand 19808 states and 35422 transitions. [2021-11-07 01:09:00,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 01:09:00,127 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:00,128 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:00,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:00,352 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2021-11-07 01:09:00,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:00,548 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:00,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:00,549 INFO L85 PathProgramCache]: Analyzing trace with hash 1711104758, now seen corresponding path program 1 times [2021-11-07 01:09:00,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:00,550 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [317558135] [2021-11-07 01:09:00,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:00,550 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:00,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:00,551 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:00,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 01:09:01,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:01,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:09:01,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:01,603 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 01:09:01,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:01,851 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 01:09:01,852 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:01,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [317558135] [2021-11-07 01:09:01,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [317558135] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:01,852 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:01,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 01:09:01,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664965202] [2021-11-07 01:09:01,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:09:01,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:01,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:09:01,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:09:01,854 INFO L87 Difference]: Start difference. First operand 19808 states and 35422 transitions. Second operand has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:02,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:02,997 INFO L93 Difference]: Finished difference Result 38698 states and 69428 transitions. [2021-11-07 01:09:02,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:09:02,998 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 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 112 [2021-11-07 01:09:02,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:03,033 INFO L225 Difference]: With dead ends: 38698 [2021-11-07 01:09:03,033 INFO L226 Difference]: Without dead ends: 19137 [2021-11-07 01:09:03,235 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 220 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 01:09:03,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19137 states. [2021-11-07 01:09:04,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19137 to 9932. [2021-11-07 01:09:04,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9932 states, 9931 states have (on average 1.7876346792870808) internal successors, (17753), 9931 states have internal predecessors, (17753), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:04,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9932 states to 9932 states and 17753 transitions. [2021-11-07 01:09:04,132 INFO L78 Accepts]: Start accepts. Automaton has 9932 states and 17753 transitions. Word has length 112 [2021-11-07 01:09:04,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:04,133 INFO L470 AbstractCegarLoop]: Abstraction has 9932 states and 17753 transitions. [2021-11-07 01:09:04,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.5) internal successors, (106), 4 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:04,133 INFO L276 IsEmpty]: Start isEmpty. Operand 9932 states and 17753 transitions. [2021-11-07 01:09:04,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-07 01:09:04,158 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:04,158 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:04,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:04,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:04,372 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:04,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:04,373 INFO L85 PathProgramCache]: Analyzing trace with hash -917515629, now seen corresponding path program 1 times [2021-11-07 01:09:04,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:04,373 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [9737077] [2021-11-07 01:09:04,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:04,374 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:04,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:04,374 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:04,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 01:09:05,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:05,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:05,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:05,549 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 01:09:05,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:05,846 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 01:09:05,846 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:05,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [9737077] [2021-11-07 01:09:05,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [9737077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:05,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1918164194] [2021-11-07 01:09:05,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:05,847 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:05,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:05,849 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:05,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 01:09:07,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:07,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:09:07,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:07,337 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 01:09:07,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:07,647 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 01:09:07,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1918164194] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:07,648 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:07,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 01:09:07,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437648734] [2021-11-07 01:09:07,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:09:07,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:07,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:09:07,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:09:07,651 INFO L87 Difference]: Start difference. First operand 9932 states and 17753 transitions. Second operand has 5 states, 5 states have (on average 21.4) internal successors, (107), 5 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 01:09:10,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:10,317 INFO L93 Difference]: Finished difference Result 10270 states and 18307 transitions. [2021-11-07 01:09:10,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:09:10,317 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 5 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 113 [2021-11-07 01:09:10,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:10,331 INFO L225 Difference]: With dead ends: 10270 [2021-11-07 01:09:10,331 INFO L226 Difference]: Without dead ends: 10071 [2021-11-07 01:09:10,334 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 439 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 01:09:10,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10071 states. [2021-11-07 01:09:11,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10071 to 9928. [2021-11-07 01:09:11,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9928 states, 9927 states have (on average 1.7875491084919914) internal successors, (17745), 9927 states have internal predecessors, (17745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:11,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9928 states to 9928 states and 17745 transitions. [2021-11-07 01:09:11,271 INFO L78 Accepts]: Start accepts. Automaton has 9928 states and 17745 transitions. Word has length 113 [2021-11-07 01:09:11,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:11,271 INFO L470 AbstractCegarLoop]: Abstraction has 9928 states and 17745 transitions. [2021-11-07 01:09:11,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 5 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 01:09:11,272 INFO L276 IsEmpty]: Start isEmpty. Operand 9928 states and 17745 transitions. [2021-11-07 01:09:11,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-07 01:09:11,285 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:11,285 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:11,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:11,503 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-11-07 01:09:11,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:11,691 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:11,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:11,692 INFO L85 PathProgramCache]: Analyzing trace with hash -176854747, now seen corresponding path program 1 times [2021-11-07 01:09:11,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:11,692 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [502751941] [2021-11-07 01:09:11,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:11,693 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:11,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:11,693 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:11,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 01:09:12,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:12,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:12,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:12,896 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 01:09:12,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:13,197 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 01:09:13,198 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:13,198 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [502751941] [2021-11-07 01:09:13,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [502751941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:13,198 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1196791912] [2021-11-07 01:09:13,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:13,199 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:13,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:13,204 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:13,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 01:09:14,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:14,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:09:14,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:15,303 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:15,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:15,794 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 01:09:15,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1196791912] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:15,794 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:15,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:09:15,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221414186] [2021-11-07 01:09:15,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:09:15,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:15,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:09:15,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:09:15,797 INFO L87 Difference]: Start difference. First operand 9928 states and 17745 transitions. Second operand has 16 states, 16 states have (on average 10.25) internal successors, (164), 15 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:34,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:34,712 INFO L93 Difference]: Finished difference Result 21758 states and 38475 transitions. [2021-11-07 01:09:34,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 01:09:34,712 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.25) internal successors, (164), 15 states have internal predecessors, (164), 0 states have call successors, (0), 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 115 [2021-11-07 01:09:34,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:34,738 INFO L225 Difference]: With dead ends: 21758 [2021-11-07 01:09:34,738 INFO L226 Difference]: Without dead ends: 21581 [2021-11-07 01:09:34,742 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 01:09:34,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21581 states. [2021-11-07 01:09:35,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21581 to 19775. [2021-11-07 01:09:35,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19775 states, 19774 states have (on average 1.7883078790330738) internal successors, (35362), 19774 states have internal predecessors, (35362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:35,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19775 states to 19775 states and 35362 transitions. [2021-11-07 01:09:35,955 INFO L78 Accepts]: Start accepts. Automaton has 19775 states and 35362 transitions. Word has length 115 [2021-11-07 01:09:35,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:35,956 INFO L470 AbstractCegarLoop]: Abstraction has 19775 states and 35362 transitions. [2021-11-07 01:09:35,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.25) internal successors, (164), 15 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:35,956 INFO L276 IsEmpty]: Start isEmpty. Operand 19775 states and 35362 transitions. [2021-11-07 01:09:35,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 01:09:35,975 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:35,975 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:35,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:36,181 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2021-11-07 01:09:36,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:36,377 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:36,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:36,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1530654321, now seen corresponding path program 1 times [2021-11-07 01:09:36,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:36,378 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [66282656] [2021-11-07 01:09:36,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:36,378 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:36,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:36,379 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:36,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 01:09:37,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:37,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:37,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:37,700 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 01:09:37,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:38,005 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 01:09:38,005 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:38,005 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [66282656] [2021-11-07 01:09:38,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [66282656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:38,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [830038910] [2021-11-07 01:09:38,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:38,006 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:38,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:38,018 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:38,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 01:09:39,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:39,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:39,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:39,793 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 01:09:39,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:40,055 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 01:09:40,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [830038910] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:40,055 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:40,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:09:40,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220561419] [2021-11-07 01:09:40,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:09:40,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:40,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:09:40,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:09:40,056 INFO L87 Difference]: Start difference. First operand 19775 states and 35362 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:41,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:41,098 INFO L93 Difference]: Finished difference Result 20176 states and 35996 transitions. [2021-11-07 01:09:41,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:09:41,098 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 01:09:41,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:41,122 INFO L225 Difference]: With dead ends: 20176 [2021-11-07 01:09:41,122 INFO L226 Difference]: Without dead ends: 19805 [2021-11-07 01:09:41,125 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:09:41,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19805 states. [2021-11-07 01:09:42,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19805 to 19661. [2021-11-07 01:09:42,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19661 states, 19660 states have (on average 1.7888097660223805) internal successors, (35168), 19660 states have internal predecessors, (35168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:42,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19661 states to 19661 states and 35168 transitions. [2021-11-07 01:09:42,209 INFO L78 Accepts]: Start accepts. Automaton has 19661 states and 35168 transitions. Word has length 116 [2021-11-07 01:09:42,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:42,210 INFO L470 AbstractCegarLoop]: Abstraction has 19661 states and 35168 transitions. [2021-11-07 01:09:42,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:42,210 INFO L276 IsEmpty]: Start isEmpty. Operand 19661 states and 35168 transitions. [2021-11-07 01:09:42,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-07 01:09:42,231 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:42,231 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:42,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:42,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:42,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:42,635 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:42,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:42,635 INFO L85 PathProgramCache]: Analyzing trace with hash -1953116395, now seen corresponding path program 1 times [2021-11-07 01:09:42,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:42,636 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [49625302] [2021-11-07 01:09:42,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:42,636 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:42,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:42,637 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:42,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 01:09:43,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:43,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:43,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:44,051 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 01:09:44,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:44,338 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 01:09:44,339 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:44,339 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [49625302] [2021-11-07 01:09:44,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [49625302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:44,339 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [170789950] [2021-11-07 01:09:44,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:44,339 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:44,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:44,340 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:44,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 01:09:45,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:45,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:09:45,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:46,325 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 01:09:46,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:46,712 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 01:09:46,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [170789950] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:46,712 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:46,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 01:09:46,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577103055] [2021-11-07 01:09:46,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:09:46,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:46,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:09:46,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:09:46,714 INFO L87 Difference]: Start difference. First operand 19661 states and 35168 transitions. Second operand has 7 states, 7 states have (on average 15.857142857142858) internal successors, (111), 7 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:49,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:49,814 INFO L93 Difference]: Finished difference Result 20158 states and 35963 transitions. [2021-11-07 01:09:49,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 01:09:49,815 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 15.857142857142858) internal successors, (111), 7 states have internal predecessors, (111), 0 states have call successors, (0), 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 117 [2021-11-07 01:09:49,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:49,840 INFO L225 Difference]: With dead ends: 20158 [2021-11-07 01:09:49,841 INFO L226 Difference]: Without dead ends: 19822 [2021-11-07 01:09:49,846 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 453 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-07 01:09:49,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19822 states. [2021-11-07 01:09:50,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19822 to 19649. [2021-11-07 01:09:51,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19649 states, 19648 states have (on average 1.7885280944625408) internal successors, (35141), 19648 states have internal predecessors, (35141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:51,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19649 states to 19649 states and 35141 transitions. [2021-11-07 01:09:51,033 INFO L78 Accepts]: Start accepts. Automaton has 19649 states and 35141 transitions. Word has length 117 [2021-11-07 01:09:51,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:51,033 INFO L470 AbstractCegarLoop]: Abstraction has 19649 states and 35141 transitions. [2021-11-07 01:09:51,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 15.857142857142858) internal successors, (111), 7 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:51,034 INFO L276 IsEmpty]: Start isEmpty. Operand 19649 states and 35141 transitions. [2021-11-07 01:09:51,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-07 01:09:51,058 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:51,058 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:51,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:51,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-11-07 01:09:51,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:51,465 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:51,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:51,466 INFO L85 PathProgramCache]: Analyzing trace with hash -1937182227, now seen corresponding path program 1 times [2021-11-07 01:09:51,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:51,467 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [62559825] [2021-11-07 01:09:51,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:51,467 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:51,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:51,468 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:51,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 01:09:52,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:52,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:52,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:53,012 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 01:09:53,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:53,303 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:09:53,303 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:53,303 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [62559825] [2021-11-07 01:09:53,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [62559825] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:53,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [536741181] [2021-11-07 01:09:53,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:53,304 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:53,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:53,304 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:53,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 01:09:54,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:54,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:09:54,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:55,659 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 01:09:55,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:56,078 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:56,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [536741181] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:56,078 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:56,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:09:56,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289266627] [2021-11-07 01:09:56,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:09:56,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:56,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:09:56,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:09:56,080 INFO L87 Difference]: Start difference. First operand 19649 states and 35141 transitions. Second operand has 16 states, 16 states have (on average 10.4375) internal successors, (167), 15 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:13,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:13,993 INFO L93 Difference]: Finished difference Result 41974 states and 74439 transitions. [2021-11-07 01:10:13,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-07 01:10:13,996 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.4375) internal successors, (167), 15 states have internal predecessors, (167), 0 states have call successors, (0), 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 117 [2021-11-07 01:10:13,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:14,047 INFO L225 Difference]: With dead ends: 41974 [2021-11-07 01:10:14,047 INFO L226 Difference]: Without dead ends: 41650 [2021-11-07 01:10:14,053 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 444 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=501, Invalid=1479, Unknown=0, NotChecked=0, Total=1980 [2021-11-07 01:10:14,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41650 states. [2021-11-07 01:10:16,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41650 to 39024. [2021-11-07 01:10:16,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39024 states, 39023 states have (on average 1.789278118032955) internal successors, (69823), 39023 states have internal predecessors, (69823), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:16,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39024 states to 39024 states and 69823 transitions. [2021-11-07 01:10:16,212 INFO L78 Accepts]: Start accepts. Automaton has 39024 states and 69823 transitions. Word has length 117 [2021-11-07 01:10:16,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:16,212 INFO L470 AbstractCegarLoop]: Abstraction has 39024 states and 69823 transitions. [2021-11-07 01:10:16,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.4375) internal successors, (167), 15 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:16,213 INFO L276 IsEmpty]: Start isEmpty. Operand 39024 states and 69823 transitions. [2021-11-07 01:10:16,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-07 01:10:16,288 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:16,288 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:10:16,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:16,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:16,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:16,705 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:16,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:16,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1896507477, now seen corresponding path program 1 times [2021-11-07 01:10:16,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:16,707 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [720887321] [2021-11-07 01:10:16,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:16,707 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:16,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:16,708 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:16,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:10:18,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:18,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:10:18,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:18,316 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 01:10:18,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:18,612 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 01:10:18,612 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:18,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [720887321] [2021-11-07 01:10:18,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [720887321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:18,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1095921029] [2021-11-07 01:10:18,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:18,613 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:18,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:18,614 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:18,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:10:20,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:20,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:10:20,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:20,877 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 01:10:20,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:21,259 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 01:10:21,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1095921029] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:10:21,259 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:10:21,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 01:10:21,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161196045] [2021-11-07 01:10:21,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:10:21,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:21,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:10:21,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:10:21,261 INFO L87 Difference]: Start difference. First operand 39024 states and 69823 transitions. Second operand has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:24,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:24,142 INFO L93 Difference]: Finished difference Result 42539 states and 75478 transitions. [2021-11-07 01:10:24,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:10:24,142 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 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 117 [2021-11-07 01:10:24,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:24,194 INFO L225 Difference]: With dead ends: 42539 [2021-11-07 01:10:24,194 INFO L226 Difference]: Without dead ends: 40553 [2021-11-07 01:10:24,201 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 455 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:10:24,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40553 states. [2021-11-07 01:10:26,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40553 to 39080. [2021-11-07 01:10:26,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39080 states, 39079 states have (on average 1.7887612272576063) internal successors, (69903), 39079 states have internal predecessors, (69903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:26,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39080 states to 39080 states and 69903 transitions. [2021-11-07 01:10:26,768 INFO L78 Accepts]: Start accepts. Automaton has 39080 states and 69903 transitions. Word has length 117 [2021-11-07 01:10:26,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:26,769 INFO L470 AbstractCegarLoop]: Abstraction has 39080 states and 69903 transitions. [2021-11-07 01:10:26,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:26,769 INFO L276 IsEmpty]: Start isEmpty. Operand 39080 states and 69903 transitions. [2021-11-07 01:10:26,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-07 01:10:26,804 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:26,804 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:10:26,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:27,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:27,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:10:27,205 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:27,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:27,206 INFO L85 PathProgramCache]: Analyzing trace with hash 1809510850, now seen corresponding path program 1 times [2021-11-07 01:10:27,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:27,206 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1478768866] [2021-11-07 01:10:27,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:27,207 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:27,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:27,207 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:27,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:10:28,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:28,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:10:28,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:29,056 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 01:10:29,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:29,356 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 01:10:29,356 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:29,356 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1478768866] [2021-11-07 01:10:29,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1478768866] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:29,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1308515060] [2021-11-07 01:10:29,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:29,357 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:29,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:29,358 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:29,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:10:31,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:31,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:10:31,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:31,759 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 01:10:31,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:32,006 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 01:10:32,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1308515060] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:10:32,007 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:10:32,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:10:32,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561585770] [2021-11-07 01:10:32,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:10:32,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:32,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:10:32,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:10:32,009 INFO L87 Difference]: Start difference. First operand 39080 states and 69903 transitions. Second operand has 9 states, 9 states have (on average 12.444444444444445) internal successors, (112), 9 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:34,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:34,655 INFO L93 Difference]: Finished difference Result 40080 states and 71511 transitions. [2021-11-07 01:10:34,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 01:10:34,656 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 12.444444444444445) internal successors, (112), 9 states have internal predecessors, (112), 0 states have call successors, (0), 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 118 [2021-11-07 01:10:34,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:34,707 INFO L225 Difference]: With dead ends: 40080 [2021-11-07 01:10:34,707 INFO L226 Difference]: Without dead ends: 39485 [2021-11-07 01:10:34,714 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 455 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 01:10:34,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39485 states. [2021-11-07 01:10:37,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39485 to 39016. [2021-11-07 01:10:37,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39016 states, 39015 states have (on average 1.7889273356401385) internal successors, (69795), 39015 states have internal predecessors, (69795), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:37,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39016 states to 39016 states and 69795 transitions. [2021-11-07 01:10:37,624 INFO L78 Accepts]: Start accepts. Automaton has 39016 states and 69795 transitions. Word has length 118 [2021-11-07 01:10:37,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:37,624 INFO L470 AbstractCegarLoop]: Abstraction has 39016 states and 69795 transitions. [2021-11-07 01:10:37,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 12.444444444444445) internal successors, (112), 9 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:37,624 INFO L276 IsEmpty]: Start isEmpty. Operand 39016 states and 69795 transitions. [2021-11-07 01:10:37,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-07 01:10:37,670 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:37,670 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:10:37,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:37,885 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-07 01:10:38,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:10:38,071 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:38,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:38,071 INFO L85 PathProgramCache]: Analyzing trace with hash 1104197214, now seen corresponding path program 1 times [2021-11-07 01:10:38,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:38,072 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [50625763] [2021-11-07 01:10:38,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:38,072 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:38,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:38,073 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:38,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 01:10:39,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:39,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:10:39,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:40,019 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 01:10:40,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:40,480 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 01:10:40,481 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:40,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [50625763] [2021-11-07 01:10:40,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [50625763] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:40,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1364993985] [2021-11-07 01:10:40,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:40,482 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:40,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:40,488 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:40,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 01:10:42,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:42,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:10:42,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:42,917 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 01:10:42,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:43,153 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 01:10:43,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1364993985] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:10:43,154 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:10:43,154 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:10:43,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551965193] [2021-11-07 01:10:43,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:10:43,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:43,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:10:43,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:10:43,156 INFO L87 Difference]: Start difference. First operand 39016 states and 69795 transitions. Second operand has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:45,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:45,361 INFO L93 Difference]: Finished difference Result 39960 states and 71286 transitions. [2021-11-07 01:10:45,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:10:45,362 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2021-11-07 01:10:45,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:45,417 INFO L225 Difference]: With dead ends: 39960 [2021-11-07 01:10:45,418 INFO L226 Difference]: Without dead ends: 39344 [2021-11-07 01:10:45,424 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 468 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:10:45,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39344 states. [2021-11-07 01:10:48,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39344 to 39013. [2021-11-07 01:10:48,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39013 states, 39012 states have (on average 1.788834204860043) internal successors, (69786), 39012 states have internal predecessors, (69786), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:48,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39013 states to 39013 states and 69786 transitions. [2021-11-07 01:10:48,348 INFO L78 Accepts]: Start accepts. Automaton has 39013 states and 69786 transitions. Word has length 120 [2021-11-07 01:10:48,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:48,348 INFO L470 AbstractCegarLoop]: Abstraction has 39013 states and 69786 transitions. [2021-11-07 01:10:48,349 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:48,349 INFO L276 IsEmpty]: Start isEmpty. Operand 39013 states and 69786 transitions. [2021-11-07 01:10:48,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-07 01:10:48,387 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:48,387 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:10:48,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:48,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:48,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:48,788 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:48,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:48,789 INFO L85 PathProgramCache]: Analyzing trace with hash 1040608253, now seen corresponding path program 1 times [2021-11-07 01:10:48,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:48,789 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [195988385] [2021-11-07 01:10:48,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:48,789 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:48,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:48,790 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:48,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 01:10:50,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:50,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:10:50,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:50,697 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 01:10:50,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:51,082 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 01:10:51,083 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:51,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [195988385] [2021-11-07 01:10:51,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [195988385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:51,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1267490710] [2021-11-07 01:10:51,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:51,083 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:51,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:51,084 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:51,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 01:10:53,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:53,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:10:53,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:53,645 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 01:10:53,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:53,887 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 01:10:53,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1267490710] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:10:53,887 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:10:53,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:10:53,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459505979] [2021-11-07 01:10:53,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:10:53,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:53,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:10:53,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:10:53,888 INFO L87 Difference]: Start difference. First operand 39013 states and 69786 transitions. Second operand has 6 states, 6 states have (on average 19.0) internal successors, (114), 6 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:56,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:56,227 INFO L93 Difference]: Finished difference Result 39883 states and 71175 transitions. [2021-11-07 01:10:56,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:10:56,228 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.0) internal successors, (114), 6 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2021-11-07 01:10:56,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:56,366 INFO L225 Difference]: With dead ends: 39883 [2021-11-07 01:10:56,366 INFO L226 Difference]: Without dead ends: 39233 [2021-11-07 01:10:56,372 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:10:56,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39233 states. [2021-11-07 01:10:59,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39233 to 38702. [2021-11-07 01:10:59,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38702 states, 38701 states have (on average 1.784966796723599) internal successors, (69080), 38701 states have internal predecessors, (69080), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:59,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38702 states to 38702 states and 69080 transitions. [2021-11-07 01:10:59,118 INFO L78 Accepts]: Start accepts. Automaton has 38702 states and 69080 transitions. Word has length 120 [2021-11-07 01:10:59,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:59,118 INFO L470 AbstractCegarLoop]: Abstraction has 38702 states and 69080 transitions. [2021-11-07 01:10:59,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.0) internal successors, (114), 6 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:59,118 INFO L276 IsEmpty]: Start isEmpty. Operand 38702 states and 69080 transitions. [2021-11-07 01:10:59,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-07 01:10:59,159 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:59,160 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 01:10:59,182 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-07 01:10:59,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:59,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:59,576 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:59,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:59,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1044995337, now seen corresponding path program 1 times [2021-11-07 01:10:59,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:59,578 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [517057802] [2021-11-07 01:10:59,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:59,578 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:59,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:59,579 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:59,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0c01dc16-59a8-49af-96dd-4218889266e6/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 01:11:01,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:01,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:11:01,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:01,650 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 01:11:01,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:01,966 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 01:11:01,967 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:11:01,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [517057802] [2021-11-07 01:11:01,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [517057802] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:11:01,967 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:11:01,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:11:01,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654668353] [2021-11-07 01:11:01,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:11:01,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:11:01,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:11:01,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:11:01,969 INFO L87 Difference]: Start difference. First operand 38702 states and 69080 transitions. Second operand has 6 states, 6 states have (on average 25.166666666666668) internal successors, (151), 6 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)